Form S70-400 OM (JUN 1999)

OPERATION - MAINTENANCE
File: SERVICE MANUAL - Section 70
Replaces: NOTHING (New Information)
Dist: 3, 3a, 3b, 3c

RXF
ROTARY SCREW COMPRESSOR UNITS
"MINI" MICROPROCESSOR CONTROL

THIS MANUAL CONTAINS OPERATION AND MAINTENANCE

INSTRUCTIONS. READ THOROUGHLY BEFORE BEGINNING
INSTALLATION. FAILURE TO FOLLOW THESE INSTRUCTIONS
COULD RESULT IN DAMAGE OR IMPROPER OPERATION
OF THE UNIT.
S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 2 OPERATION - MAINTENANCE

Contents
"MINI" MICROPROCESSOR CONTROL PANEL .......................................................................................................................... 3
KEYS AND KEY FUNCTIONS ...................................................................................................................................................... 4
OPERATING DISPLAY .................................................................................................................................................................. 4
SETPOINTS DISPLAY .................................................................................................................................................................. 5
TO CHANGE THE ADJUSTABLE SETPOINTS: ........................................................................................................................... 6
HOW TO DETERMINE ADJUSTABLE SETPOINTS: .................................................................................................................... 6
SETPOINTS DISPLAY, Fixed, Page 1 * ........................................................................................................................................ 7
SETPOINTS DISPLAY, Fixed, Page 2 * ........................................................................................................................................ 7
ANNUNCIATOR DISPLAY ............................................................................................................................................................. 7
SECURITY DISPLAY * .................................................................................................................................................................. 9
COMMUNICATIONS DISPLAY * ................................................................................................................................................... 9
AUTO-CYCLE DISPLAY * ............................................................................................................................................................. 9
ANALOG OFFSET DISPLAY ........................................................................................................................................................ 9
HOW THE MICROPROCESSOR WORKS SUMMARY .............................................................................................................. 10
MULTIPLE COMPRESSOR SEQUENCING ............................................................................................................................... 11
MICROPROCESSOR OUTPUT DATA CODE ............................................................................................................................. 11
MICROPROCESSOR TELECOMMUNICATIONS ....................................................................................................................... 11
COMMUNICATIONS PROTOCOL SPECIFICATIONS: ............................................................................................................... 11
TROUBLESHOOTING THE RXF MICROPROCESSOR............................................................................................................. 14
GENERAL INFORMATION.......................................................................................................................................................... 14
TROUBLESHOOTING FRICK SBC MICROPROCESSOR SYSTEM ......................................................................................... 14
EPROM MEMORY I/C CHIP REPLACEMENT ........................................................................................................................... 16
SBC BOARD REPLACEMENT.................................................................................................................................................... 16
MICROPROCESSOR DISPLAY REPLACEMENT ...................................................................................................................... 16
FUSE REPLACEMENT ............................................................................................................................................................... 16
MICROPANEL ASSEMBLY WIRING DIAGRAM ......................................................................................................................... 18
 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
OPERATION Page 3

Operation
"MINI" MICROPROCESSOR CONTROL PANEL

THE FOLLOWING MUST BE READ, In addition to the keyboard, there is an emergency stop but-
AND UNDERSTOOD, IN ADDITION ton. Pushing the emergency stop will bypass the computer
TO THE OPERATING AND START- and remove all power from the outputs. This will shut down
UP INSTRUCTIONS IN S70-200 IOM, BEFORE ATTEMPT- the compressor motor and all control power (120v) to the
ING TO START OR OPERATE THE UNIT. compressor auxiliary systems such as the oil pump and liq-
uid injection solenoid. THE EMERGENCY STOP BUTTON
The RXF compressor is controlled by a state-of-the-art IS FOR EMERGENCY SHUTDOWN SITUATIONS ONLY
microprocessor control system. The microprocessor continu- AND MUST NOT BE USED TO ROUTINELY SHUT OFF
ously monitors the compressor unit’s condition and operation. THE COMPRESSOR.
The microprocessor also directs instructions to the various
compressor unit subsystems. The microprocessor hardware contains an internal watchdog
circuit. If the microprocessor should fail, this circuit will dis-
The microprocessor has a membrane switch keyboard. able (turn off) all outputs.
Pressing the keyboard in the area outlined as a key will cause
that function to be recognized by the microprocessor. The
keyboard has 32 membrane-type keys.
S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 4 OPERATION

KEYS AND KEY FUNCTIONS

1. Operating display (5 Pages)
The [CHANGE] key rotates the display through the different 2. Setpoints display (7 Pages)
display screens. The [CHANGE] key is also used to change 3. Annunciator display (22 Pages)
the status of various setpoints. This key, when pressed, will 4. Communications display (1 Page)
cause the existing settings to be replaced with “#” symbol
for each number of the setting. To change from pounds [F2] Security display
per square inch (G) to inches of mercury (HG) press the [F4] Auto Cycle display
[CHANGE] key when the (G) or (HG) is flashing.

The [STEP] key steps or moves a set of flashing characters OPERATING DISPLAY
through the Adjustable setpoints on the Setpoints displays,
the Auto-cycle display and the Security display. The set-
point replaced by the flashing “#” symbol may be changed OPERATING DISPLAY, Page 1 *
or updated. The [STEP] key is also used when the Annun-
ciator display is selected to step through the annunciator’s SUCT DISH OIL mode
information displays. // G ///G ///G state
NOTE: The [ * ] key is used to step or move to previous
screens, described above, one at a time. The Operating display is continuously updated and provides
a variety of information in regard to the current status of the
The [ENTER] key is used to change or enter new setpoints. compressor’s condition and performance.

The [CLEAR] key will reset an alarm or cutout indication on The information furnished by the Operating display is as
the annunciator screen(s) and will clear the microprocessor follows:
to allow continued operation or restarting if all conditions
have returned to normal and no other control lockouts are SUCT - Suction Pressure is measured at the compressor
in force. inlet and is displayed in pounds per square inch gauge (G)
or in inches of mercury (HG).
The [NUMERIC KEYPAD] is used to introduce new setpoint
limits. DISH - Discharge Pressure is measured at the compressor
outlet and is displayed in pounds per square inch gauge
The [+/-] key will call up the Analog Offset display, page 1, (G).
then page 2.
OIL - Oil Pressure is measured prior to entering the compres-
The [RUN], [STOP], and [REMOTE START] keys control the sor and is displayed in pounds per square inch gauge (G).
starting and stopping of the compressor unit.
mode - mode displays the status of the compressor unit. The
The [ALARM SILENCE] key will de-energize the alarm mode of operation will be indicated as either manual (MAN)
horn output. when the [RUN] key has been pressed, automatic (AUTO)
when Auto Cycle has been activated, remote (RMT) when
The [AUTO], [REMOTE], and [MANUAL] keys control the the [RMT] key has been pressed, or off (OFF MODE).
operation of the compressor slide valve.
state - state displays the current condition of the compressor
The [AUTO], [MANUAL 2.2], [MANUAL 3.5], and [MANUAL unit. The display will indicate if the unit is running (RUNG),
5.0] keys control the operation of the compressor slide stop. off (OFF), shutdown (SHUTD) because of some compres-
sor or system condition or alarm (ALARM) when there is an
The [F1] function key will return the operator to the main alarm condition.
operating display. This function may be invoked at any time,
even during setpoint entry. OPERATING DISPLAY, Page 2 *
The [F2] function key will call up the Security display. NOTE: DISCH OIL SEPARATOR
Press the [F2] key, as prompted by the display, to return
///F ///F ///F
to the previously selected display.

The [F3] function key is nonoperational.

DISCH - Discharge Temperature in degrees Fahrenheit
The [F4] function key will call up the Auto Cycle display. is displayed.
NOTE: To exit the Auto Cycle display, press the [F1] key
as prompted by the display. OIL - Oil Temperature is displayed in degrees Fahrenheit.

The microprocessor has a liquid crystal display in a 2 line by SEPARATOR - Separator displays the oil separator temper-
20 character format, for a total of 40 characters. There are 6 ature in degrees Fahrenheit.
different display modes with a total of 36 possible displays.
When power is first applied to the control panel, the unit will
be in the Operating display mode. To change to a different
display mode, press the [CHANGE] key. The display modes
in their order of rotation are: * Display for illustrative purposes only.
 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
OPERATION Page 5

OPERATING DISPLAY, Page 3 * this, an information space has been provided to indicate
whether V ratio is in the automatic (AUTO) or the manual
COMP-mode FLA HEATER (MAN) mode.
state ///% OFF
RECYCLE - A Recycle Delay message indicates that the
compressor has started and has shut down within the time
COMP - Compressor mode indicates whether the compres- delay setpoint period. The Recycle Delay will prevent the
sor is in automatic (AUTO), remote (RMT), or manual (MAN) compressor from starting until the delay time expires and
operating mode. is intended to prevent damage to the compressor motor
from successive restarts. During Recycle Delay, the micro-
STATE - state indicates the unit operating condition when run- processor will alternatively flash “RECYCLE DELAY” and
ning (RUNG), off (OFF), shutdown (SHUTD), or (ALARM). the remaining delay time in minutes. The (RECYCLE . .
.) message appears only when the compressor is in the
FLA - Percent Full-Load Amps displays the percentage of recycle mode.
the drive motor full-load amperage rating that the motor is
currently using. NOTE: Consult Motor Manufacturer for the recom-
mended duration of the Recycle Delay.
HEATER - Heater displays the condition of the oil separator
heater(s), indicating ON or OFF. If the [RUN] key is pushed while
the unit is in Recycle Delay, the
compressor will start at the end
OPERATING DISPLAY, Page 4 * of the delay period.
S.V.///% CAP.CON=//G
SETPOINTS DISPLAY
AUTO-L SUCT.P.=//G
SETPOINTS DISPLAY, Adjustable, Page 1 *
S.V. % - Slide valve position is displayed as a percentage.
This percentage reflects the mechanical position of the CCSP=//G LPCO=//G
slide valve and does not reflect the percentage of full-load LPA =//G
operation. Immediately below this information, space has
been provided to indicate whether the S.V. % is in the auto-
matic (AUTO), manual (MAN), or remote (RMT) mode. The The information furnished by the Adjustable Setpoints of the
microprocessor will control this function in the automatic Setpoints display is as follows.
mode. To the right of the mode indicator, three other mes-
sages may appear: CCSP - The Capacity Control Setpoint, reported in pounds
per square inch gauge (G) or inches of mercury (HG), con-
L - indicates Slide Valve loading. trols the loading and unloading of the compressor when S.V.
U - indicates Slide Valve unloading. is in the automatic (AUTO) mode.
FU - indicates Slide Valve forced unloading.
LPCO - The Low Suction Pressure Cutout, reported in
A Forced Unload (FU) message indicates that the percentage pounds per square inch gauge (G) or inches of mercury (H),
of motor full-load amps has exceeded the maximum limit will shut down the compressor if the suction pressure drops
and the microprocessor is unloading the compressor until to this limit or lower, for 90 seconds or longer.
the percentage FLA falls back to normal limits.
LPA - The Low Suction Pressure Alarm, reported in pounds
CAP CON - The Capacity Control setpoint, reported in per square inch gauge (G) or inches of mercury (HG), will
pounds per square inch gauge (G) or inches of mercury trigger a prealarm if the suction pressure drops to this limit
(HG), controls the loading and unloading of the compressor or lower.
when S.V. is in the automatic (AUTO) mode.
SETPOINTS DISPLAY, Adjustable, Page 2 *
SUCT.P. - Suction Pressure is measured at the compressor
inlet and is displayed in pounds per square inch gauge (G) or PB DB CT
in inches of mercury (HG). This is the same value as shown 15 1.0 10
on “Operating Display, Page 1.”
PB - The Proportional Band (PB) is used to determine the
OPERATING DISPLAY, Page 5 * amount of time the load/unload solenoid is energized, ac-
cording to how far away from the setpoint the actual control
VOLUME RATIO - /./ pressure or temperature is. The smaller the number, the
AUTO RECYCLE 30 MIN more load/unload will be sent. A PB of 10% is default. It is
adjustable to 2, 5, 10, 15, 20, or 25 percent.

VOLUME RATIO - Volume Ratio is the ratio selected by the DB - The Dead Band (DB) is a + (plus) or - (minus) value
microprocessor to provide the highest efficiency at any given above or below the setpoint at which the compressor will
suction and discharge pressure condition. Immediately below neither load nor unload. It is adjustable between .5 and 5.0
psig or degrees, in increments of .5 units.

* Display for illustrative purposes only.

S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 6 OPERATION

CT - The Cycle Time (CT) setpoint is the amount of time MLC FORCE UNLD - The Motor Load Control Force Unload
between the beginning of each load/unload response. It is (MLFU), reported as a percentage of the motor full-load amps
adjustable to 5, 10, 15, 20, 25, or 30 seconds. (FLA), will force the compressor to unload until the motor
full-load amps (FLA) falls to less than the stop load setpoint.
Use the [STEP] key to step to the desired setpoint, then MLFU will show on display when active. NOTE: Consult mo-
press the [CHANGE] key to change the CC, PB, DB, and CT tor manufacturer for recommended setpoint.
values. Enter the desired value for the remaining setpoints
and press [ENTER] when complete. TO CHANGE THE ADJUSTABLE SETPOINTS:
SETPOINTS DISPLAY, Adjustable, Page 3 * Adjustable Setpoints are stored in memory and are easily
changed in the field.
HPCO=///G AUX1-A-NC Although the Adjustable Setpoints
HPA =///G AUX2-S-NO are not lost if power is interrupted,
we suggest that a list of Adjustable
Setpoints be affixed to one end of the microprocessor
HPCO - The High Discharge Pressure Cutout, reported cabinet for reference.
in pounds per square inch gauge (G), will shut down the
compressor if the discharge pressure equals or exceeds NOTE: The following procedure also applies to the chang-
this setpoint. ing of the Security and Auto Cycle display setpoints.

HPA - The High Discharge Pressure Alarm, reported in 1. Press the [CHANGE] key to rotate the display to any of the
pounds per square inch gauge (G) will trigger a prealarm if Adjustable Setpoints displays (Pages 1, 2, 3, 4, or 5).
the discharge pressure equals or exceeds this setpoint.
2. Press the [STEP] key to move or step through the various
AUX 1 and AUX 2 - May be configured for either an alarm or setpoints. A setpoint is selected for change or update when
shutdown and with either a normally closed (NC) or normally it is flashing.
open (NO) contact.
3. Having selected the setpoint to be changed, the [NU-
SETPOINTS DISPLAY, Adjustable, Page 4 * MERIC KEYPAD] may be used to enter the new setpoint.
NOTE: All digits must be entered, including zeros. For
RECYCLE DELAY=30 MIN example, (01.0).
C.T. FACTOR =///
NOTE: The AUX 1 and AUX 2 setpoints, once selected, are
changed or updated by pressing the [CHANGE] key.
RECYCLE DELAY - The Recycle Delay displays the current
recycle delay setpoint in minutes. NOTE: Consult motor NOTE: Certain setpoints may be reported in either
manufacturer for recommended setpoint. pounds per square inch gauge (G) or inches of mercury
(HG). Having selected the setpoint, press the [CHANGE]
CT FACTOR - The Current Transformer Factor records the key to toggle between (G) and (HG).
proper current transformer factor to match the compressor
motor FLA rating to the current transformer primary amp 4. In the event that an incorrect setpoint is keyed in, press
rating. The CTF factor is programmable and its correct value the [CLEAR] key to restore the original setpoint. Pressing
is determined by the following formula: the [CLEAR] key a second time will eliminate the flashing
characters.
1024 x FLA (Full Load Amps *)
CTF = 5. Having keyed in the desired setpoint, press the [ENTER]
10x CT (Current Transformer Primary Amps **)
key. The new setpoint will be entered and the next adjustable
* See motor nameplate. setpoint will begin flashing.
** See CT located in starter panel.
NOTE: A setpoint entry outside the parameters of the
EXAMPLE: FLA = 230 Amps Adjustable Setpoint display will be refused.
CT = 300 (300:5)

CTF =
1024 x 230
= 80 (Round to whole number)
HOW TO DETERMINE
10 x 300 ADJUSTABLE SETPOINTS:
Adjustable Setpoints should reflect values compatible with
SETPOINTS DISPLAY, Adjustable, Page 5 * normal system operation. Too high a Low Suction Pressure
Alarm setpoint may cause nuisance prealarms. Similarly,
MLC STOP LOAD=/// % cutout setpoints should not fall within what are considered
normal plant operation. As a rule of thumb, set the Low Suc-
MLC FORCE UNLD=/// %
tion Pressure Alarm 5 PSIG lower than the lowest normal
suction pressure. The Low Suction Pressure Cutout should
MLC STOP LOAD - The Motor Load Control Stop Load
be 5 to 10 PSIG lower than the Low Suction Pressure Alarm
(MLSL), reported as a percentage of the motor full load
setpoint.
amps (FLA), will prevent the compressor capacity control
from loading when the setpoint is equaled or exceeded.
NOTE: Consult motor manufacturer for recommended
setpoint. * Display for illustrative purposes only.
 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
OPERATION Page 7

The High Discharge Pressure Cutout should be set at 90% Alarm will occur if oil pressure is 25 lb below discharge pres-
of the setting of the lowest high side relief valve. The High sure or within 10 lb of suction pressure for 30 seconds. Cutout
Discharge Pressure Alarm should be set 10 PSIG lower than occurs if oil pressure is 30 lb below discharge pressure or if
the Cutout. oil pressure is within 7 lb of suction pressure for 10 seconds
and alarm has already been set.
The Capacity Control setpoint should be the equivalent of
the normal suction condition.
ANNUNCIATOR DISPLAY
SETPOINTS DISPLAY, Fixed, Page 1 * When a prealarm or cutout occurs, a flashing ALARM or
SHUTD (shutdown) indicator will appear in the lower right
HDTC=212 HOTC=167 hand corner of the “Operating Display, Page 1” and in the
HDTA=194 HOTA=159 lower left hand corner of “Operating Display, Page 3”. To
determine the fault, rotate to the Annunciator display by
HDTC - The High Discharge Temperature Cutout, reported pressing the [CHANGE] key.
in degrees Fahrenheit, will shut down the compressor if the
discharge temperature equals or exceeds this setpoint. The Annunciator display will show all failures, individually. If
there is only one failure, the annunciator display will appear
HDTA - The High Discharge Temperature Alarm, reported as shown on the following “Annunciator Display's”. When the
in degrees Fahrenheit, will shut down the compressor if the system has failed for more than one condition, (USE STEP)
oil temperature equals or exceeds this setpoint. will appear in the upper right side of the display. The appli-
cable failure displays will be individually rotated through by
HOTC - The High Oil Temperature Cutout, reported in de- pressing the [STEP] key. Continued pressing of the [STEP]
grees Fahrenheit, will shut down the compressor if the oil key will result in the applicable failure displays repeating.
temperature equals or exceeds this setpoint. Pressing the [CLEAR] key while at the Annunciator display
will clear all alarms and/or cutouts.
HOTA - The High Oil Temperature Alarm, reported in de-
grees Fahrenheit, will trigger a prealarm if the oil temperature In order to restore the Annunciator display and resume
equals or exceeds this setpoint. normal operation, it will be necessary to go through the fol-
lowing steps:
SETPOINTS DISPLAY, Fixed, Page 2 *
1. Correct the conditions causing the alarm.
LOTC=49 HON =113
LOTA=58 HOFF=122 2. Press the [ALARM SILENCE] key. (This action may pre-
cede correcting the conditions causing the alarm).
LOTC - The Low Oil Temperature Cutout, reported in de-
3. To clear or reset the Annunciator pages, press the
grees Fahrenheit, will shut down the compressor if the oil
[CLEAR] key. This will also clear the ALARM, SHUTD, or
temperature equals or falls below this setpoint.
CUTOUT indicator from the Operating display.
LOTA - The Low Oil Temperature Alarm, reported in degrees
4. Press [F1] to call up the Operating display. If the conditions
Fahrenheit, will trigger a prealarm if the oil temperature
causing the alarm have not been corrected or a new fault
equals or falls below this setpoint.
has occurred, the ALARM, SHUTD, or CUTOUT message
will appear.
HON - The setpoint, in degrees Fahrenheit, to turn on the oil
heater when the oil temperature in the oil separator equals
NOTE: Use of the Emergency Stop Button may trip one
or falls below this setpoint.
or more alarm setpoints.
HOFF - The setpoint, in degrees Fahrenheit, to turn off the oil
5. After all failures have been corrected and the [CLEAR]
heater when the oil temperature in the oil separator equals
key has been pressed and if there are no failures, the An-
this setpoint.
nunciator display will show (NO FAILURES).
Compressor Differential Cutout between Suction and
Discharge - The differential cutout has been lowered from ANNUNCIATOR DISPLAY, NO FAILURES*
55 lb to 25 lb. Cutout will occur after five minutes. To allow
operation at low differential pressures, the micro will take ANNUNCIATOR
the following steps: NO FAILURES

A. Force unload the compressor to 50% and display an "F

Unload" when the oil pressure is within 10 lb of the main oil ANNUNCIATOR DISPLAY, 1 FAILURE*
injection port pressure and the slide valve position is greater
than 50%. ANNUNCIATOR
HIGH PRESSURE CUTOUT
B. Prohibit the compressor from loading and display a "Ld
Inhib" message when the differential is within 15 lb of the
main oil injection port pressure.

Oil Pressure Alarm and cutout - Logic has been revised

to same logic as currently used on RXB/RXF. The new logic
is as follows: * Display for illustrative purposes only.
S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 8 OPERATION

ANNUNCIATOR DISPLAY, ANNUNCIATOR DISPLAY*

MULTIPLE FAILURES*
ANNUNCIATOR
ANNUNCIATOR USE STEP DISCH TEMP ALARM
HIGH PRESS ALARM

ANNUNCIATOR DISPLAY*
The remaining screens show additional fail-
ure messages that may appear. ANNUNCIATOR
COMPRESSOR AUXILIARY
ANNUNCIATOR DISPLAY*
ANNUNCIATOR ANNUNCIATOR DISPLAY*
LOW PRESS CUTOUT
ANNUNCIATOR
OIL LEVEL
ANNUNCIATOR DISPLAY*
ANNUNCIATOR ANNUNCIATOR DISPLAY*
LOW PRESS ALARM
ANNUNCIATOR
COMP DIFFERENTIAL
ANNUNCIATOR DISPLAY*
ANNUNCIATOR ANNUNCIATOR DISPLAY*
OIL PRESS CUTOUT
ANNUNCIATOR
AUX #1 ALARM
ANNUNCIATOR DISPLAY*
ANNUNCIATOR ANNUNCIATOR DISPLAY*
OIL PRESS ALARM
ANNUNCIATOR
AUX #1 SHUTDOWN
ANNUNCIATOR DISPLAY*
ANNUNCIATOR ANNUNCIATOR DISPLAY*
HI OIL TEMP CUTOUT
ANNUNCIATOR
AUX #2 ALARM
ANNUNCIATOR DISPLAY*
ANNUNCIATOR ANNUNCIATOR DISPLAY*
HI OIL TEMP ALARM
ANNUNCIATOR
AUX #2 SHUTDOWN
ANNUNCIATOR DISPLAY*
ANNUNCIATOR ANNUNCIATOR DISPLAY*
LO OIL TEMP CUTOUT
ANNUNCIATOR
BAD E2PROM CHIP
ANNUNCIATOR DISPLAY*
ANNUNCIATOR ANNUNCIATOR DISPLAY*
LO OIL TEMP ALARM
ANNUNCIATOR
SENSOR FAULT
ANNUNCIATOR DISPLAY*
ANNUNCIATOR
DISCH TEMP CUTOUT
* Display for illustrative purposes only.
 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
OPERATION Page 9

SECURITY DISPLAY * AUTO-CYCLE DISPLAY *

KEYBD ENTRY ENABLED START=//G MIN.SV.=//

ENTER CODE ***** STOP =//G ENABLE=YES

The [F2] function key will call up the Security display. The The Auto Cycle display is accessed by pressing [F4]. The
Security display allows the operator to either enable or dis- Auto Cycle display provides for independently adjustable
able the microprocessor’s keyboard to prevent unauthorized setpoints to turn the compressor on and off in response to
tampering with the various adjustable setpoints. When en- the suction pressure or as an adjustable setpoint to limit the
abled, the microprocessor keyboard is fully operative and the minimum slide valve position.
security lockout is not in effect. When disabled, the keyboard
is rendered partially nonfunctional. All displays will still be NOTE: To change the Auto Cycle setpoints, refer to “TO
accessible through the keyboard. If any attempt is made to CHANGE THE ADJUSTABLE SETPOINTS”.
enter new adjustable setpoints, however, the microprocessor
will default to the Security display. START - Compressor Start-up will bring the compressor
back on line when the suction pressure rises to the displayed
setpoint.
TO ENABLE THE KEYBOARD, press the [STEP] key so that
the Enter Access Code asterisks (*****) flash, key the proper STOP - Compressor Stop will shut down the unit if the suc-
five digit access code, and press [ENTER]. The Setpoints tion pressure drops to or below the displayed setpoint limit.
Access will toggle from disabled to enabled and adjustable NOTE: This limit must be set higher than Low Suction
setpoint entry is now possible. Pressure Cutout and the Low Suction Pressure Alarm
setpoints.
TO DISABLE THE KEYBOARD, press the [F2] function key
to call up the Security display. Press the [STEP] key until the MIN. SV - Minimum Slide Valve Position, shown as a per-
Enter Access Code asterisks (*****) flash, key the proper centage, will limit the slide valve position to the displayed
five digit access code, and press [ENTER]. Now, press the setpoint.
[STEP] key until ENABLED/DISABLED beside KEYBD
ENTRY flash and press the [CHANGE] key to toggle from ENABLE - Indicates whether Auto Cycle is active (YES)
enabled to disabled. or not active (NO). Press the [CHANGE] key while at this
setpoint to change the status. Upon deactivation, the com-
TO CHANGE THE ACCESS CODE, press the [F2] function pressor will return to the previous mode of operation.
key to call up the Security display. Press the [STEP] key until
the Enter Access Code asterisks (*****) flash, key the proper The Analog Offset Display is accessed by pressing [+/-] key.
five digit access code, and press [ENTER]. Now, select the
Enter Access Code a second time by pressing the [STEP] ANALOG OFFSET DISPLAY, PAGE 1 *
key until the asterisks flash, key in the new five digit access
code, and press [ENTER]. SUCT DISCH OIL TEMP.
+0 +1 -1
NOTE: Power loss will not affect the Security display.

NOTE: IF NO ACCESS CODE WAS ENTERED AND THE

DISABLED COMMAND WAS SELECTED, THE ACCESS ANALOG OFFSET DISPLAY, PAGE 2 *
CODE IS [00000].
DISCH OIL SEP TEMP.
LOST OR FORGOTTEN ACCESS CODE: Consult Frick +0 +0 +2
for assistance.
All analog values can be offset + or - 5 units, depending on
COMMUNICATIONS DISPLAY * which value is being adjusted. Use the [STEP] key to step
through the desired setpoint. Press the [CHANGE] key to
COMMUNICATIONS change the value of the offset by 1. The actual analog value
ID# = 33 BAUD = 9600 will be displayed under the word “PRESS” or “TEMP”.

ID - The ID number is a programmable identification code

used in telecommunications to access a specific compres-
sor.

BAUD - Shows the baud rate of the RS-422 communication

port. Both ports are configured as follows: word = 8 bit, par-
ity = none or even, stop = 1 bit. The communications port is
programmable from 300 to 19200 baud.

* Display for illustrative purposes only.

S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 10 OPERATION - MAINTENANCE

HOW THE MICROPROCESSOR WORKS A typical example of how the microprocessor responds can
SUMMARY be illustrated by the responses generated by the micropro-
cessor as oil temperature increases. Assume that the ambi-
The Frick microprocessor has 3 major components and a va- ent temperature and compressor unit temperature is 45OF,
riety of sensors. The major components are the SBC (single liquid injection, R-22 refrigerant and you have just pressed
board computer) 1 display screen, and the keyboard. the [RUN] key to start the compressor unit:

The SBC can be considered the brain of the microprocessor AT 45OF

control console. The SBC contains the logic center which Microprocessor receives information that the oil tempera-
provides the rules by which the microprocessor will oper- ture is below 49OF, the low oil temperature cutout setpoint,
ate, the integrated circuit chips which store the burned in and triggers a cutout. The microprocessor will prevent the
memory of how the compressor unit is to behave, an analog compressor package from being started. The microproces-
input to convert Volts DC from the various sensors into com- sor also instructs the oil heater(s) output to energize the oil
puter binary language, and RAM (random access memory) heater(s).
integrated circuit chips to store information which can be
readily changed by the microprocessor or, as in the case AT 50°F
of adjustable setpoints, by the operator. The SBC collects When the oil temperature reached 50OF the microprocessor
information, processes the information, and delivers instruc- would allow the Low Oil Temperature Cutout to be cleared
tions to the displays and to the output modules. and the compressor unit could now be started. (Assume that
the [RUN] key has been pressed and that the compressor
The SBC gathers information from several sources on the has now started.) The low oil temperature alarm would still be
compressor unit. Pressure transducers sense changes in engaged and cannot be cleared until oil temperature exceeds
pressure and return a variable DC voltage of 1 to 5 VDC to 58OF. The oil heater(s) shut off on compressor start.
the SBC. The signals are converted into binary code which
the microprocessor understands. The microprocessor scans AT 113°F
the incoming data many times per second and compares the The microprocessor instructs the liquid injection solenoid
information it receives with the instructions programmed in output to deenergize the liquid injection solenoid.
the PROM chips, information stored in the RAM chips, and
instructions it has received from the console keyboard. As AT 122°F
operating conditions change, the microprocessor also for- The microprocessor instructs liquid injection solenoid output
wards the information it is receiving to the display screen. to energize and the oil heater(s) output to deenergize (This
When an operating condition or conditions develop which is a fail-safe. The heater(s) should already be deenergized
the microprocessor program identifies as requiring a specific due to compressor running.)
action, the microprocessor generates an instruction which is
forwarded to the output modules. The instruction triggers a AT 50° TO 157°F
solid state output device capable of handling control voltage Normal operating range. The microprocessor continues
and the instruction is executed. monitoring oil temperature and reporting this information on
the Operating display.
If the microprocessor receives information that indicates an
abnormal operating condition has been reached or is present, AT 158°F
it will generate one or more of the following instructions: The microprocessor triggers the High Oil Temperature Alarm
and displays the alarm on the Operating display and the
1. If a subsystem on the compressor unit, such as the oil Annunciator display.
heater(s) or liquid injection, can correct the problem, the
microprocessor will energize or deenergize this system. AT 167°F
The microprocessor instructs the compressor motor to shut
2. If an alarm setpoint has been reached,the microprocessor down and displays a SHUTD indication on the Operating
will trigger the alarm and display this information on the display. Information regarding the cutout will also be retained
Operating display and the Annunciator display. by the Annunciator display(s).

3. If a cutout setpoint has been reached,the microprocessor NOTE: If the operator makes an error by attempting to
will trigger the cutout and shut down the compressor. The start the compressor under conditions outside safe
microprocessor will indicate CUTOUT on the Operating dis- normal operating conditions, the microprocessor will
play. Information will be available through the Annunciator prevent start-up and advise the operator of the fault.
display.
 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
OPERATION - MAINTENANCE Page 11

MULTIPLE COMPRESSOR SEQUENCING MICROPROCESSOR

FOR RXF COMPRESSOR UNITS WITH MI- TELECOMMUNICATIONS
CROPROCESSOR CONTROLS
The Frick RXF Microprocessor comes with an onboard
A - The standard microprocessor panel includes: telecommunications interface. The telecommunications fea-
ture permits interfacing the microprocessor with a modem,
1. Remote Run Input remote data communications terminal, or master computer
2. Remote Load Input via RS-422 protocol. In the case of a modem, telephone
3. Remote Unload Input lines are used for the actual transmission of data permitting
communications from a remote location.
The remote run input is only recognized when the remote
run mode has been selected by pressing the “remote start” The components necessary to utilize the telecommunications
key on the front panel of the microprocessor. feature will vary with the application. Information concerning
these items may be obtained from Frick, Waynesboro, Pa.
The remote load and unload inputs can only be recognized
when the [remote] key in the slide valve column on the front COMMUNICATIONS PROTOCOL
panel of the microprocessor has been pressed. SPECIFICATIONS:
B - A master sequence controller must be installed to provide All commands must be in ASCII (CAPS) to be recognized. A
the signals to remote start and stop the compressors and compressor with an ID code of [00] is considered disabled.
remote load and unload the compressors based on the ID Codes from [01] thru [99] are valid and are recognized
common suction pressure or other parameter. The customer by the microprocessor.
may supply his own master sequencer panel (usually a pro-
grammable controller) or Frick can supply this sequencer, if
desired (contact Frick for pricing). The following is a complete list of available command
types:

COMMAND CODE and DESCRIPTION

I = Returns compressor status information.
R = Compressor start command.
S = Compressor stop command.
V = Compressor capacity control command.
P = Return Pressures information.
T = Return Temperatures information.
A = Return full load amps information.
C = Enter Change setpoints mode.

The following is a detailed description of each command:

RETURN COMPRESSOR STATUS INFORMATION: #01I
# Start of command sequence.
01 Compressor ID code.
I Return Status information command.
RETURNED ANSWER, ie: 090RRRN340
Character Description
MICROPROCESSOR OUTPUT DATA CODE Position of returned data
1,2,3 Capacity control position.
A 3.5 K OHM, 10 watt resistor (RES) must be field installed, 4 Remote, Auto, Manual (Cap control)
as shown below, when the 120 VAC outputs of the RXF are 5 Delay-recycle, Running, Off.
driving 120 VAC solid state input devices such as program- 6 Rem, Man, Off, Auto (Compressor mode)
7 Cutout, Alarm, Normal.
mable controllers. 8,9,10 Suction in PSIA.
(Carriage return, line feed.)

COMPRESSOR START COMMAND: #01R01

# Start command sequence.
01 Compressor ID code.
R Start compressor command.
01 ID code repeated for verification
NOTE: The compressor must be in the remote
start mode for this command to be executed.

Returned answer: A01

Character Description
Position of returned data

1 Acknowledge of command sent.

2,3 ID code of compressor.
(Carriage return, line feed.)
S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 12 OPERATION - MAINTENANCE

COMPRESSOR STOP COMMAND: #01S01 RETURN PRESSURES COMMAND: #01PX

# Start command sequence. # Start command sequence.
01 Compressor ID code. 01 Compressor ID code.
S Stop compressor command. P Return pressures command.
01 ID code repeated for verification
X = S Return suction pressure (PSIA).
NOTE: The compressor must be in the remote X = D Return discharge pressure (g/hg).
start mode for this command to be executed. X = O Return oil pressure (g).
X = A Return all pressures.
RETURNED ANSWER: A01
If the command was #01PS, then the micro-
Character Description processor would dump the suction pressure.
Position of returned data
RETURNED ANSWER:
1 Acknowledge of command sent.
2,3 ID code of compressor. XXX = 3 characters followed by a carriage
(Carriage return, line feed.) return, line feed.
If using the "A" command, then the returned
data would be:
COMPRESSOR SLIDE VALVE #01VLXX
CONTROL COMMANDS: #01VUXX XXXXXXXXX = 9 characters followed by a
#01VS carriage return, line feed.
#01VP
# Start command sequence.
01 Compressor ID code. RETURN TEMPERATURES COMMAND: #01TX
V Compressor control command.
L Load Slide valve command. # Start command sequence.
U Unload slide valve command. 01 Compressor ID code.
XX = 00 Turns selected output off. T Return temperature command.
XX = 01 to 15 Turns selected output on
for XX seconds. X = D Return discharge temperature.
XX = 99 Turns selected output on. X = O Return oil temperature.
S Return slide valve position value. X = P Return separator temperature.
P Return slide stop position value. X = A Return all temperatures as a string
of data.
If the command was #01VL00, then the load
slide valve output on compressor #1 would be If the command was #01TS, then the micro-
turned off. If the command was #01VL05, then processor would dump the suction temperature.
the load slide valve output on compressor #1
would be turned on for 5 seconds, and would RETURNED ANSWER:
then automatically turn off. NOTE: the slide
valve must be in the remote mode for this XXXX = 4 characters followed by a carriage
command to be executed. return, line feed for suction.
XXX = 3 characters followed by a carriage
RETURNED ANSWER (for L or U commands): A01 return, line feed for discharge, oil,
and separator.
Character Description If using the "A" command, then the returned
Position of returned data data would be:
1 Acknowledge of command sent. XXXXXXXXX = 9 characters followed by
2,3 ID code of compressor. carriage return, line feed.
(Carriage return, line feed.)

RETURNED ANSWER (for S command), ie: 090 COMPRESSOR DISPLAY SCREENS COMMAND: #01DX
1,2,3 Slide valve position.
RETURNED ANSWER (for P command), ie: 2.2 # Start command sequence.
(Carriage return, line feed) 01 Compressor ID code.
D Compressor control command.

X = O Operating display (Page 1,2,3,4, & 5

CHANGE SLIDE VALVE MODE #01MVR will be dumped consecutively)
X = S Adjustable Setpoints display
# Start command sequence (Page 1 through 5)
01 Compressor ID Code X = X Fixed Setpoints display (Page 1 & 2)
MV Change slide valve mode + ID X = C Autocycle display.
X = P Security display.
X = A Auto mode.
X = R Remote mode. If the command was #01D0, then the micropro-
cessor would dump the operating display.
If the command #01MVRID was sent, the slide
valve mode would change to Remote and
the returned answer would be A01 followed RETURN FULL LOAD AMPS COMMAND: #01A
by carriage return, line feed.
# Start command sequence.
01 Compressor ID code.
A Return full load amps command.
If the command was #01A, then the micro-
processor would dump the full load amps value.

RETURNED ANSWER:
XXX = 3 characters followed by a carriage
return, line feed.
 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
OPERATION - MAINTENANCE Page 13

READ FAILURES COMMAND: #01F READ INPUT/OUTPUT COMMAND #01X

# Start command sequence. # Start command sequence.
01 Compressor ID Code. 01 Compressor ID Code.
F Read Failures command. X Read Input/Output(s) command.

Returned Answer: Returned Answer:

00000000000000000000000 1000001100000000

Character Description Character Description

Position Position
1 High Press Cutout 1 Oil Level Input 1
2 High Press Alarm 2 Remote Run Input 2
3 Low Press Cutout 3 Remote Load Input 3
4 Low Press Alarm 4 Remote Unload Input 4
5 Oil Press Cutout 5 Compressor Aux Input 5
6 Oil Press Alarm 6 Aux 1 Input 6
7 Hi Oil Temp Cutout 7 Aux 2 Input 7
8 Hi Oil Temp Alarm 8 Compressor Run Output 1
9 Lo Oil Temp Cutout 9 Slide Valve Load Output 2
10 Lo Oil Temp Alarm 10 Slide Valve Unload Output 3
11 Disch Temp Cutout 11 Slide Stop Increase Output 4
12 Disch Temp Alarm 12 Slide Stop Decrease Output 5
13 Comp Auxiliary 13 Liquid Injection Output 6
14 Pump Auxiliary 14 High Vi Liquid Injection
15 Oil Level Output 7
16 Comp Differential 15 Oil Heated Output 8
17 Aux. #1 Alarm 16 Alarm Output 9
18 Aux. #1 Shutdown
19 Aux. #2 Alarm Example:
20 Aux. #2 Shutdown If the answer returned was
21 Bad E2Prom Chip U6
22 Sensor Fault 1000001100000000

Example: the inputs/outputs on compressor #1

If the answer returned was which are energized are:

00000100000000000000000, Oil Level Input 1

Aux 2 Input 7
compressor #2 has an Oil Press Alarm. Compressor Run Output 1

CHANGE SETPOINTS COMMAND: #01C RETURN FAIL LIST: #01L

# Start command sequence. #

01 Compressor ID code. 01
C Change setpoint command. L Return Fail List
xxx New setpoint
xx New setpoint Will return a descriptive comment for
y g or h for gauge or inches each fail that is currently active, each
line is terminated by a carriage return,
The following is the complete list of the line feed if there are no failures active.
setpoints that may be changed while in the No response is given.
change setpoints command:

01xxxy Capacity Control Setpoint

02xxxy Change Low Pressure Cutout Setpoint. CHANGE COMPRESSOR MODE #01MCR
03xxxy Change Low Pressure Alarm Setpoint.
04xxx Change High Pressure Cutout Setpoint # Start command sequence
05xxx Change High Pressure Alarm Setpoint. 01 Compressor ID Code
06xxx Change MLC Stop Load Setpoint. MC Change compressor mode + ID
07xxx Change MLC Force Unload Setpoint.
08xx Change Recycle Delay Setpoint. X = O Off mode.
09xxx Change CTF Setpoint. X = A Auto mode.
X = R Remote mode.
01 Compressor ID code.
If the command #01MCRID was sent, the com-
RETURNED ANSWER: pressor mode would change to Remote and
the returned answer would be A01 followed
Axxxx The new setpoint which was sent by carriage return, line feed.
followed by a carriage return, line
feed.
CLEAR FAILURE COMMAND #01KF
If the command was sent #01C01300g01, the
capacity control setpoint would be changed # Start command sequence
to 30.0g and the returned answer is A300g 01 Compressor ID Code
followed by a carriage return, line feed. K Clear command + ID
If the command sent was #01C0711001, the MLC
force unload setpoint would be changed to X = F Clear fails.
110% and the returned answer is A110 fol- X = R Clear recycle delay.
lowed by a carriage return, line feed.
If the command sent was #01C0520002, the If the command #01KFID was sent, the
returned answer is “BAD” followed by the ID compressor cutout would clear and
number and a carriage return, line feed. the returned answer would be A01 followed
by carriage return, line feed.
g or h : must be lower case - exception to "All commands
must be caps" statement at beginning of section.
S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 14 MAINTENANCE

Most problems encountered with the microprocessor and

Maintenance control circuits will be the result of a wiring fault, blown fuse,
or failure of a peripheral control such as a solenoid coil or a
TROUBLESHOOTING pressure transducer. Faults in the computer, while possible,
THE RXF MICROPROCESSOR are unlikely. If a fault develops in the computer, the prob-
ability is that all functions will cease and the display screen
This section contains information on troubleshooting and will go blank.
making corrections to the microprocessor and control circuits
of the RXF unit. This section is composed of four parts: a The control system of the RXF compressor consists of a
general information section, a troubleshooting guide, a repair 120 volt AC (high voltage) side and a DC (low voltage) side.
procedure guide, and a section with illustrative schematics The 120 volt side actuates solenoids, relays, alarms, and
and data. other electromechanical functions. The DC side operates
the computer and its various sensors. The microprocessor
GENERAL INFORMATION console contains the SBC (single board computer) and one
display screen.
THE COMPONENTS WITHIN THE
MICRO PROCESSOR CONSOLE When working within the micropro-
CAN BE INADVERTENTLY DAM- cessor console, 120 VOLTS CAN
AGED BY STATIC ELECTRICITY OR MISHANDLING. CAUSE INJURY OR DEATH.
ONLY QUALIFIED TECHNICIANS SHOULD DIRECTLY
HANDLE THESE COMPONENTS. To troubleshoot the low voltage side of the RXF control cir-
cuits, it is necessary to have the following tools:
1. DO NOT REMOVE the microprocessor console cover or 1. Accurate digital multimeter.*
attempt to make corrections to the microprocessor power 2. Small wire stripper.
supply without shutting off the control power. Accidental 3. Small screwdriver.
shorts can irreparably damage the SBC (single board com- 4. Small snip nose pliers.
puter) or the display screen. 5. 15 watt soldering iron (no larger).
6. .032,60/40 rosin core solder.
2. DO NOT HANDLE the SBC or the display screen board 7. IC chip extraction and insertion tools.*
when their cables are disconnected without first attaching 8. Grounding strap.*
a ground strap to prevent static electrical discharge from 9. Static-free grounded work surface.
your body.
* Available from Frick. Order kit 451862, P/N 111Q0451862.

TROUBLESHOOTING FRICK SBC MICROPROCESSOR SYSTEM

(Refer to wiring diagrams)
NOTE: Before proceeding, check all wiring connections, wire nuts, terminal strips, etc. Also, make sure operating condi-
tions are calling for change.

SYMPTOM PROBABLE CAUSES and CORRECTIONS

DISPLAY IS INOPERATIVE Check the 10 amp fuse (2FU) which controls all voltage going to the microprocessor.

Check F1 on SBC, F2 if 230 VAC.

Shut off power to the microprocessor and confirm that all cable and wire connections are made.

COMPRESSOR AUXILIARY Output 1 controls the Compressor Start Relay (2CR). If the compressor does not start and
SHUTDOWN the LED for Output 1 is on, check the fuse FU1 (5 amp). If the problem persists,
check the interposing relay (2CR). Check Wire 28 before fuse. If fuse ok, then possible bad output.

The Compressor Starter Auxiliary Contacts turn on Input 5 when they are closed.
These contacts are located on the Compressor Starter.Check terminal 20 for voltage input.

OIL HEATERS DO NOT The oil heaters should operate only when the compressor is NOT running and the oil in the
OPERATE separator sump is cold.

If the oil heaters do not work, check between wires 25 and 2 for voltage. If none, check fuse FU1
(15 amp). If the fuse is not blown, check between Wires 11 and 2. If 120VAC is not found, check
output 8 to ensure it is energized. Check fuse FU8 if output is on. If there is voltage, check between
Wires 26 and 2. If no voltage, then replace CR1.

SLIDE VALVE DOES NOT LOAD Verify that the Slide Valve is in the AUTO mode and that capacity control is calling for loading
and/or UNLOAD or unloading (AUTO L or AUTO U will appear on the Operating display).

If 120VAC is not found when the LED for Output 2 is on, check the fuse (FU2).

Output 2 controls the Slide Valve Load Solenoid. If 120VAC is found across Wires 17 and 2, the
Slide Valve Load Solenoid should be energized. If not, the solenoid is defective or neutral
wiring from coil is loose.
 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
MAINTENANCE Page 15

TROUBLESHOOTING FRICK SBC MICROPROCESSOR SYSTEM (Continued)

SYMPTOM PROBABLE CAUSES and CORRECTIONS

SLIDE VALVE DOES NOT LOAD Output 3 controls the Slide Valve Unload Solenoid. If 120VAC is found across Wires 16 and 2, the
and/or UNLOAD (Continued) Slide Valve Unload Solenoid should be energized. If not, the solenoid is defective. If 120VAC is
not found across Wires 16 and 2 when the LED for Output 3 is on, check the fuse (FU3).

Check for Motor Load Control Stop Load (MLSL) and Motor Load Control (Forced Unload) (MLFL);
Check Autocycle-minimum Slide Valve position;manually cycle to check for bad pot or that rod is
hung. If all ok, Hydraulic System Troubleshooting.

NOTE: Verify that the proper setpoint has been programmed into C.C. (Capacity Control) on
theAdjustable Setpoints display.

SLIDE STOP DOES NOT Output 4 controls the Slide Stop 3.5 Vi Solenoid. If 120VAC is found across Wires 15 and 2, the
INCREASE and/or DECREASE Slide Stop 3.5 Vi Solenoid should be energized. If not, the solenoid is defective. If 120VAC is not
found across Wires 15 and 2 when the LED for Output 4 is on, check the fuse (FU4).

Outputs 4 and 5 control the Slide Stop 2.2 Vi Solenoid. If 120VAC is found across Wires 14 and 2,
the Slide Stop 2.2 Vi Solenoid should be energized. If not, the solenoid is defective. If 120VAC is
not found across Wires 14 and 2 when the LED for Output 5 is on, check the fuse (FU5).

LIQUID INJECTION SOLENOID Verify that the Liquid Injection TXV is modulating properly and not feeding excessive liquid to
DOES NOT ENERGIZE (LICO the compressor. When oil temperature drops too low, the microprocessor SHOULD deenergize
ONLY) this solenoid.

Output 6 controls the Liquid Injection Solenoid. If 120VAC is found across Wires 13 and 2, the
Liquid Injection Solenoid should be energized. If not, the solenoid is defective. If 120VAC is not
found when the LED for Output 6 is on, check the fuse (FU6).

HI Vi LIQUID INJECTION PORT Output 7 controls the Hi Vi Liquid Injection Port solenoid. If 120VAC is found across Wires 12 and
SOLENOID DOES NOT 2, the Hi Vi Liquid Injection Port Solenoid should be energized. If not, the solenoid is defective.
ENERGIZE If 120VAC is not found when the LED for output 7 is on, check the fuse (FU7).

NOTE: This output should only be on when the Vi is at 5.0.

ALARM CIRCUIT DOES NOT Output 9 controls the Alarm Circuit. The Alarm should turn on only when there is a prealarm or
ENERGIZE shutdown. If the Alarm does not sound when these conditions are found, check for 120VAC
across Wires 10 and 2. If 120VAC is not found, check the fuse (FU9).

CONTROL PANEL DOES NOT Inputs 2 through 4 can be used to operate the compressor from a remote location.
RESPOND TO REMOTE
CONTROL SIGNALS NOTE: Check the Operating display to verify that the compressor and the Slide Valve
are in the REMOTE MODE.

If 120VAC is found (across Wires 21 and 2, 22 and 2, and 23 and 2) and the input does not turn
on, and after checking for bad input and loose wires, consult Frick.

MOTOR LOAD CONTROL The current transducer is used to convert the AC motor amps to a DC voltage signal for the
(FORCED UNLOAD) OCCURS microprocessor. If the %FLA reading from the Operating display is incorrect, consult Frick Co.

PRESSURES ON THE TEST 1 - Shut down the compressor and allow pressures to equalize. Discharge pressure
OPERATING DISPLAY and oil pressure should have the same reading.
DO NOT APPEAR CORRECT
TEST 2 - If either oil pressure or discharge pressure read different pressures, one or both
transducers are at fault. Valve off the suction transducer from the unit and open the vent
valve on transducer manifold to atmosphere. If the suction transducer reads atmospheric
pressure, then the suction transducer is correct.

NOTE: A 1% tolerance is allowed for all transducers.

COMPRESSOR DOES NOT Verify that the [AUTO] key has been pressed and AUTO appears under SV Pos on the
AUTOMATICALLY Operating display #4.
LOAD OR UNLOAD
If the problem persists, see the Troubleshooting section SLIDE VALVE DOES NOT LOAD
and/or UNLOAD.

DISPLAY SCREENS DISPLAY A loose or improper connection between the displays and the SBC is indicated. Remove fuse
SCRAMBLED PATTERN OR (2FU, 10 amp) for 15 seconds, then restore to reset the displays.
LIST ALPHABET

ANNUNCIATOR DISPLAY E2PROM chip malfunction or bad. The system may still be run by resetting all Adjustable Setpoints
MESSAGE “BAD E2PROM and clearing Annunciator Display. If condition repeats, replace E2PROM chip in slot U6.
CHIP U6”
S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 16 MAINTENANCE

EPROM MEMORY I/C CHIP REPLACEMENT Pay particular attention to the

orientation of the notch(es) on
Microprocessor EPROM memory I/C chip is located inside the end of the chip(s). Install the
the microprocessor console on the SBC board. A special chip(s) on the replacement board in exactly the same
tool is required to remove this chip to prevent damaging it position as they were on the defective board.
(See Troubleshooting The Microprocessor). The procedure
to replace the EPROM memory chip is outlined below: 4. Then install the modified replacement board in the panel.

1. Shut off control power. MICROPROCESSOR DISPLAY REPLACEMENT

2. Open console cover. The procedure to replace the microprocessor display is
outlined below:
3. Using a chip extraction tool, remove old and install new
chip. NOTE: The chip must be inserted into socket U3. 1. Shut off control power.
The notched end of the chip must 2. Remove the defective display(s).
be up when the chip is inserted to
match the notch on the U3 chip 3. Install the new display(s).
socket.
FUSE REPLACEMENT
SBC BOARD REPLACEMENT 1. Shut off control power.
The procedure to replace SBC boards is outlined below:
2. Open console cover.
1. Shut off control power.
3. Identify faulty fuse.
2. Remove the old board from the machine and the new board
4. Use voltmeter to verify that no voltage is present on either
from its packing and place both on an antistatic surface.
side of the fuse.
3. Remove the program chip(s) from the defective board and
5. Remove faulty fuse using fuse puller.
install them in the replacement board.
6. Install new plug-type fuse.
 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
MAINTENANCE Page 17

MICRO COMPONENT PLACEMENT DIAGRAM

S70-400 OM (JUN 99) RXF "MINI" MICROPROCESSOR CONTROL
Page 18 MAINTENANCE

MICROPANEL ASSEMBLY WIRING DIAGRAM

 RXF "MINI" MICROPROCESSOR CONTROL S70-400 OM (JUN 99)
MAINTENANCE Page 19

MICROPANEL ASSEMBLY WIRING DIAGRAM - continued

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Form S70-400 OM (600) FRICK

Supersedes: NOTHING 100 CV Avenue • P.O. Box 997
Subject to change without notice Waynesboro, PA USA 17268-0997
Printed in USA • GUI 100 806 2.00 Phone: 717-762-2121 • FAX: 717-762-8624
© 2006 Johnson Controls Inc. - ALL RIGHTS RESERVED www.frickcold.com