SCREW AIR COMPRESSOR CONTROLLER

MODLE: MAM-860

USER

MANUAL

Shenzhen Plot Electronic Co., Ltd

Address：4-5F,5 Bldg,Highstar Industry Park,Gangtou Community,
Bantian,Longgang District,Shenzhen City，China
Telephone：（+86 0755）83173599 / 83172822 Postal code：518129
Fax：（+86 0755）83172966 E-mail：plt@pltsz.com
Web site：www.pltsz.com
 VOTE OF THANKS
Thank you for your trustworthy and select of PLOT air compressor controller !

Shenzhen Plot Electronic Co., Ltd specializes on the manufacture and R&D of air

compressor controller. We are devoted to win customer trust through our high quality

products and service.

We try our best to ensure the completeness and correctness of the manual, but

PLOT Company shall reserve the rights for continuous research and improvement on

its products and assume no obligation for the modification and improvement on the

previously delivered products. The design of products is subject to the change

without notice.

Please feel free to contact our after-sale service center if you encounter any

problem with our product.

You are always welcome to make suggestions and advices!

 Notice

Please read all the operation manual before operating the set and keep this manual for further
reference.

Installation of MAM—8** compressor controller can be performed only by professional technicians.

Installation position shall be considered carefully in order to ensure good ventilation and reduce
electromagnetic interference.

Wiring shall be performed respectively according to regulations for heavy and weak current to reduce
electromagnetic interference.

RC snubber must be connected to the two terminals of coil (such as AC contactor ,valve, etc),which
are controlled by relay output.

Port connection shall be inspected carefully before power on.

Correct ground connection (the third ground)can help increase product capacity of resisting signal
interference.

Set rated current of motor: the max current of motor/1.2.

Features：
● Chinese / English display.
● Remote control/Local control.
● Block mode/Independent mode.
● On-off control of motor.
● Prevention for air compressor reversion.
● Temperature measurement, control and protection.
● Voltage measurement and protection.
● RS485 communication function, supporting MODBUS RTU protocol.
● Protection for open phase, overload current, unbalance current, high voltage, low voltage.
● High integration, high reliability, high cost performance.

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 Contents
1, Basic Operation .................................................................................................................................................- 3 -
1, Button Explanation ....................................................................................................................................- 3 -
2, Indicator Instruction...................................................................................................................................- 4 -
3, Status Display and Operation ....................................................................................................................- 4 -
4, Operating Parameter and Menu .................................................................................................................- 4 -
5, User Parameter View and Modification:....................................................................................................- 5 -
6,User Parameter Sheet and Function............................................................................................................- 6 -
7, Factory Parameter View and Modification ................................................................................................- 8 -
8, Factory Parameter Sheet and Function ......................................................................................................- 9 -
9, Calibration Parameter ..............................................................................................................................- 10 -
10, Operating Authorization and Password .................................................................................................- 11 -
2, Controller Function and Technical Parameter .................................................................................................- 12 -
3, Model and Specification ..................................................................................................................................- 13 -
1, Model Description ...................................................................................................................................- 13 -
2, Power consumption Table for Corresponding Motor...............................................................................- 13 -
4, Installation .......................................................................................................................................................- 14 -
1, Mechanical Installation............................................................................................................................- 14 -
2,Electrical Wiring Installation....................................................................................................................- 16 -
5, Control Process................................................................................................................................................- 17 -
1, Single Machine ........................................................................................................................................- 17 -
2, Net Work..................................................................................................................................................- 18 -
3, Fan Operation ..........................................................................................................................................- 18 -
6, Alarm Function ................................................................................................................................................- 18 -
1, Air Filter Alarm .......................................................................................................................................- 18 -
2, Oil Filter Alarm .......................................................................................................................................- 18 -
3, O/A separator Alarm................................................................................................................................- 18 -
4、Lubricating Oil Alarm............................................................................................................................- 18 -
5, Grease Alarm ...........................................................................................................................................- 18 -
6, Belt Alarm................................................................................................................................................- 18 -
7, High Discharge Air Temperature Alarm ..................................................................................................- 18 -
7, Controller Protection .......................................................................................................................................- 19 -
1, Motor Protection......................................................................................................................................- 19 -
2, Protection of High Discharge Air Temperature .......................................................................................- 19 -
3, Protection of Air Compressor Non-reversing ..........................................................................................- 19 -
4, Protection of High Pressure .....................................................................................................................- 19 -
5, Protection of Sensor Failure ....................................................................................................................- 19 -
8, Troubleshooting ...............................................................................................................................................- 19 -
1, This Fault Review....................................................................................................................................- 19 -
2, Common Failures and Causes..................................................................................................................- 20 -
9, Block mode control and net work....................................................................................................................- 21 -
1, Block mode control..................................................................................................................................- 21 -
2. Net Work..................................................................................................................................................- 23 -
10. Schematic Diagram........................................................................................................................................- 24 -

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1, Basic Operation
1, Button Explanation

Figure 1.1.1
——Start Button:
1, When compressor is at stop status, press this button to start the compressor.
2, When compressor is set as master (No.1) in block mode, press this button to start the
compressor and activate block mode function at the same time.
——Stop Button：
1, When the compressor is at running status, press this button to stop the compressor;
2, When compressor is set as master (No.1) in block mode, press this button to stop
compressor and block mode function as well;
3, When compressor is at stop status, long press this button to display software edition.

——Set Button /Loading / unloading Button:

1, When the compressor is at running status, press this button to load, unload;
2, When the compressor is at setting mode, press this button after modification to
confirm and save the modified data.

——Move down button / Decreasing button:

1, When viewing the menu, press this button to move downward the cursor;
2,When modifying data, press this button to decrease the data at current position.

——Move up button/Increasing button:

1, When viewing the menu, press this button to move upward the cursor;
2, When modifying data, press this button to increase the data at current position.

——Shift button /Enter button:

1, When modifying data, press this button to move to the next data bit;
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 2, When select menu, press this button to switch to submenu. If no submenu
available, the controller will shift to data setting mode.

——Return button / Reset button:

1, When modifying data, press this button to exist data setting mode;
2, When viewing the menu, press this button to return to previous-menu;
3, When the controller is at failure stop status, long press this button to reset.

2, Indicator Instruction
Power Indicator：Indicator on when controller is energized.
Operation indicator：Indicator is on when motor is running.
Error indicator：Indicator is blinking when alarming; indicator on when fail to stop; indicator off when error
is cleared

3, Status Display and Operation

The display screen will show as below after power on:

WELCOME USING

SCREW COMPRESSOR After power on, show this menu

After 5 seconds, the menu will switch as below:

AIR T：78℃
AIR P：0.60MPA Main menu
NORMAL STOP 0S
C16 REMOTE

Press “ ” to enter into Selection Menu:

RUN PARA.
USER PARA. Level 1 menu
FACTORY PARA.
CALBR PARA.

4, Operating Parameter and Menu

Press “ ”to move the cursor to “RUN PARAMETER”, then press “ ” to switch to
the secondary menu:

MOTOR、 FAN CUR

TOTAL RUN TIME
THIS RUN TIME
MAINTAIN PARA.

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 HISTORY FAULT
PRODUCTION DATE、NUM.
THIS FAULT
COM STATUS

Move the cursor to the corresponding menu item, press “ ” to check the specific
parameter. Such as viewing "MOTER FAN CUR ", move the cursor to the “MOTER FAN
CUR " menu item, press the “ ”, switch to the item of motor , fan data .

MAIN（A） FAN （A）

A 50.1 2.1
B 50.1 2.1
C 50.1 2.1

Press the “ ” to return to the previous menu or the main menu. If no operation at the
current menu for 120 Seconds, controller will automatically return to the main menu and
turn off the backlight simultaneously.

5, User Parameter View and Modification:

In first menu, press the “ ” and “ ” to move the cursor to the "USER
PARA." item, press the “ ” to switch to the following menu:

P、T SET
SET TIME
OPERATION MODE
BLOCKING MODE

CLR LIFE TIME

MAX LIFE TIME
LANG. LANG. SELECT CH/EN
NEW USER PIN：****

Move the cursor to the "P、T SET " item, then press “ ” to switch to the following menu:
LOAD P：00.62 MPa
UNLOAD P：00.78MPa
FAN START T：0080℃
FAN STOP T：0075℃

Move the cursor to the “LOAD P” item, then press “ ” to switch to the following
menu which requires a user password input.

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 INPUT CODE
****

In this menu, the first data bit of password started blinking，press “ ” or “ ” to

modify the the first bit of password，Press the “ ”, move the cursor to the next data bit,
modify the second data of password. In accordance with the above, modify the third and
fourth data of password in sequence. Press“ ” to confirm the input data and the menu
will switch to the following menu after verification:

LOAD P：00.62 MPa *

UNLOAD P：00.78MPa The upper right corner with "*
FAN START T：0080℃ Indicates the system verification of the password
FAN STOP T：0075℃

In the menu above, press “ ”, the first data of loading pressure starts to blink, user
can press “ ” or “ ” to modify the present data in accordance with the above
method .Press “ ” to move to next data bit and modify to the target data in sequence.
When finished, press “ ” to confirm and save the data. The controller prompt sends out
a short voice to tip the completion of parameter set.

6,User Parameter Sheet and Function

First menu Second menu Preset Data Function

1, In AUTO LOADING, compressor will load if
pressure is below this set data
LOAD P. 00.60MPa
2, In STANDBY mode, compressor will start if
the pressure is below this set data
1, Compressor will unload automatically if air
pressure is above this set data
SET P. T. UNLOAD P. 00.80Mpa
2, This data should be set above LOAD P ,also
should be set below ULD LIM P
FAN START Fan will start if discharge air temperature is above
0080℃
T this set data
Fan will stop if discharge air temperature is below
FAN STOP T 0070℃
this set data
Set the master start time, record time when master
MOTOR is activated, controller will not start overload
TIME SET 0008S
DELAY protection during this time to avoid stopping the
master by impulse starting current
Set the fan start time, record time when fan is
activated, controller will not start overload
FAN DELAY 0006S
protection during this time to avoid impulse
starting current stopping the fan.
STAR
0006S Time from star start to delta start.
DELAY

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 LOAD Unloading in this set time after enter delta
0002S
DELAY running
When unloading continuously, compressor will
UNLOAD
0600S automatically stop and enter to standby status if
DELAY
over this set time
For NORMAL STOP operation, compressor will
STOP DELAY 0010S stop after it continuously unloading over this set
time
Machine can be restarted only over this set time
START
0100S at any case(after NORMAL STOP, STANDBY or
DELAY
FAILURE STOP )
ON/OFF
LOCAL/REMOTE c
MODE
1,When set as the MANU: only when the
pressure is above “unloading pressure”,
compressor will unload automatically .For any
other case, the Loading/Unloading function can
LOAD
AUTO/MANU only be executed by pressing “loading
MODE
/unloading ” key.
2,When set as AUTO ,the loading/ unloading
OPERATION function can be executed by the fluctuation of air
MODE pressure automatically
PRESET 1,When set as PROHIBIT, the communication
function is invalid.
2,When set as COMP. ,compressor function as a
PROHIBIT
COM MODE slave and is able to communicate with computer
/COMP./BLOCK
or DCS
3,When set as BLOCK, compressor can net
control
Set the communication ADD in block mode or
COM
0001 when communicate with monitoring center. This
ADDRESS
ADD is unique for every controller in net
1,When service as master in BLOCK. Master
controls slave, the COM ADDRESS should be
BLOCK
MASTER/SLAVE No.1
MODE
2,When service as slave in BLOCK, slave is
controlled by master
When master pressure is between BLOCK LOAD
TURN TIME 0099 Hours P and BLOCK UNLOAD P, master determine
BLOCKING slave work alternatively over this set time .
MODE
BLK NUMER 0000 Number of air compressors in block net
SETTING
In BLOCK, one compressor will start or load
BLK MIN 00.65MPa
when pressure is below this set data
In BLOCK mode, one compressor will stop or
BLK MAX 00.75MPa
unload when pressure is above this set data
In BLOCK mode, when master sends two
BLK DELAY 0050S commands continuously, second command signal
delays for this set data.
0000H Record total running time of oil filter, if changing
CLR LIFE
OIL FILTER new oil filter, the data should be reset by manual
TIME
operation.
0000H Record total running time of O/A separator. If
O/A
changing new O/A separator, the data should be
SEPARATOR
reset by manual operation
0000H Record total running time of air filter .If changing
AIR FILTER new air filter, the data should be reset by manual
operation

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 0000H Record total running time of lube. If changing
LUBE lubricate ,the data should be reset by manual
operation
0000H Record total running time of grease. If changing
GREASE new grease, the data should be reset by manual
operation
0000H Record total running time of belt. If changing
BELT new belt, the data should be reset by manual
operation
9999H 1,Alarm prompts when total running time of oil
filter is above the set data.
OIL FILTER
2,Set this data to “0” to clear oil filter running
time
9999H 1,Alarm prompts when total running time of O/A
O/A separator is above the set data.
SEPARATOR 2,Set this data to “0” to clear O/A separator
running time
9999H 1,Alarm prompts when total running time of air
filter is above the set data.
AIR FILTER
2,Set this data to “0” to clear air filter running
MAX LIFE time
TIME PRESET 9999H 1,Alarm prompts when total running time of
lubricate is above the set data.
LUB
2, Set this data to “0” to clear lubricate running
time.
9999H 1,Alarm prompts when total running time of
grease is above the set data.
GREASE
2,Set this data to “0” to clear grease running
time
9999H 1,Alarm prompts when total running time of belt
is above the set data.
BELT
2,Set this data to “0” to clear belt running
time .
1,Set to “EN” , Display in English
LANG.SEL EN/CH EN
2,Set to “CH” , Display in Chinese
NEW USER **** User could modify the user password by old user
****
PIN password or factory password

7, Factory Parameter View and Modification

FACTORY PARAMETER store relatively parameter set by factory. To check FACTORY PARAMETER,
you have to verify password first. In the first menu, press “ ” and “ ” to FACTORY PARAMETER,
press “ ”to switch to the menu below.

INPUT CODE
****

Input the correct password to switch to the FACTORY PARAMETER menu as below:

MOTOR CUR：100.0A
FAN CUR：010.0A -8-
ALARM T：0105℃
STOP T：0110℃
 STOP P：00.90MPa
MAX U.L.：00.85MPa
RUN TIME：001234H
LOAD TIME：001001H

For more factory parameter, please check factory parameter sheet. When modify factory parameter, please
refer to customer parameter modification method, supper-password is required to set TOTAL RUN
TIME,PHASE PROT,POWER FREQ and MAX RUN TIME.

8, Factory Parameter Sheet and Function

PARAMETER Initial Data Function

Maximum motor
When the current of motor is more than 1.2 times of the set data, the
MOTOR CUR overload data
unit will stop for overload feature. (see table2.1.1)
/1.2
Maximum fan When the current of fan is more than 1.2 times of the set data, the
FAN CUR
overload data/1.2 unit will stop for overload feature.
When discharge air temperature reaches this set data, compressor
ALARM T. 105℃
will alarm
When the discharge air temperature reaches this set data, compressor
STOP T. 110℃
will alarm and stop
STOP P. 1.00MPa When pressure reaches this set data ,compressor will alarm and stop
This data is the maximum of UNLOADING P. The UNLOADING P
MAX U.L. 0.80MPa
in the customer parameter must be set no higher than this data.
RUN TIME 000100Hours Modify the TOTAL RUN TIME
LOAD TIME 000095Hours Modify the TOTAL LOAD TIME
Input the password 8888 and press “set “button to clear all the
CLR FAULT ****
history failure record.
MAX-MIN >= SET*MIN/10 ,respond time is 5s
CUR UN.BAL. 0006
If the set data ≥ 15, the unbalance protection will be invalid.
If OPEN PHASE protection ≥20 seconds, OPEN PHASE protection
OPEN PAHSE 002.0s
is invalid
PROD DATE ****-**-** Production date
PROD NO ******** Product serial No.
PHASE ON: turn on phase sequence protection
ON/OFF
PROT.. OFF: turn off phase sequence protection
POWER FREQ 50HZ/60HZ Set the operation power frequency
Set as compatible mode, block mode is the same as the other series
ADV/COMPATI controller by PLOT
BLK MODE
BLE When block control with MAM 8*0 controller and set as advanced
mode, more block mode function is available
1, Controller detects the voltage higher than this set data, the
HIGH VOL. 0460V shutdown protection starts and reports HIGH VOL.
2,Set this data to 0000, the HIGH VOL. protection function is invalid
1, Controller detects the voltage lower than this set data, shutdown
LOW VOL. 0320V protection starts and reports LOW VOL.
2,Set this data to 0000, the LOW VOL. protection function is invalid
LOW T PRO- -0048℃ 1,In stop mode, air compressor is not allowed to start when discharge
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 air temperature is lower than this set data
2,Two minutes after turn on, when the air temperature is below this
data, compressor will stop and display T SENSOR FAULT
1,When the compressor is in a stop status and the TOTAL RUN
TIME exceeds this TIME LIM set, the controller will stop the
TIME LIM 0000H
compressor and display USER MISTAKE;
2,If this data is set to ‘0000’, TIME LIMIT function is invalid.
Controller detects oil filter, O/A separator, air filter, lubricate
ALM STOP 0010H oil ,grease and belt running with alarming over this ALARM STOP
set, compressor will stop and report ”ALARM LONG STOP ”
1,When set as ON, User can use DCS to set data through
MODBUS protocol；
COM SET 2,When set as OFF, User cannot use DCS to set data through
ON/OFF
PARA MODBUS protocol
3, User can use DCS to set data only when compressor is at stop
status
PARA1 **** User could modify the factory password by old factory password.

9, Calibration Parameter
You can set relative data of controller in CALBR PARA. It is not allowed to view and modify without
manufacturers authorization, so please verify the password before view and modification. The modification
of CALBR PARA is similar with CUSTOMER PARA. Main function is shown as below.
PARAMETER Initial Data Function
1,When calibrate the current of motor A, revise
standard current data, controller calibrate the current by
TARGET figuring the current coefficient and save the data
0000
CUR automatically
MOTOR
2,Standard current data will return to zero after
A calibration
When calibrate the current, revise coefficient. Current
COEF 1.000
data in display=sample data*coefficient
CUR ***.*A This data is qret
1,When calibrate the current of motor B, revise standard
current data, controller calibrate the current by figuring
TARGET
CUR
0000 the current coefficient and save the data automatically
MOTOR
2,Standard current data will return to zero after
B calibration
When calibrate the current, revise coefficient. Current
COEF 1.000
data in display=sample data*coefficient
CUR ***.*A this data is qret
1,When calibrate the current of motor C, revise standard
current data, controller calibrate the current by figuring
TARGET
CUR
0000 the current coefficient and save the data automatically
MOTOR
2,Standard current data will return to zero after
C calibration
When calibrate the current, revise coefficient. Current
COEF 1.000
data in display=sample data*coefficient
CUR ***.*A this data is qret
FAN
TARGET 0000 1,When calibrate the current of fan A, revise standard
A
CUR current data, controller calibrate the current by figuring
- 10 -
the current coefficient and save the data automatically
 2,Standard current data will return to zero after
calibration
When calibrate the current, revise coefficient. Current
COEF 1.000
data in display=sample data*coefficient
CUR ***.*A this data is qret
1,When calibrate the current of fan B ,revise standard
current data, controller calibrate the current by figuring
TARGET
CUR
0000 the current coefficient and save the data automatically
FAN
2,Standard current data will return to zero after
B calibration
When calibrate the current, revise coefficient. Current
COEF 1.000
data in display=sample data*coefficient
CUR ***.*A this data is qret
1,When calibrate the current of fan C ,revise standard
current data, controller calibrate the current by figuring
TARGET
CUR
0000 the current coefficient and save the data automatically
FAN
2,Standard current data will return to zero after
C calibration
When calibrate the current, revise coefficient. Current
COEF 1.000
data in display=sample data*coefficient
CUR ***.*A this data is qret

10, Operating Authorization and Password

Controller provides multiple passwords and access management. According to different levels
of passwords, controller provides different levels of operating authorization, details as following:
1. User operation password: fixed:___________
Permissions: allows to modify the LOADING P, UNLOADING P, FAN START T, FAN START T,
ON/OFF MODE, LOAD MODE, COM MODE, COM ADD and BLOCKING MODE.

2. New user password: factory set:___________

Permissions: Allows to modify all CUSTOMER PRAMETER.

3. Mmanufacturer sales password: factory set:___________

Permissions: Allows users to modify all CUSTOMER PRAMETER, the NEW USER PIN, some
MANUFACTURER PARAMETER, MANUFACTORY SALES PASSWORD.

4. Mmanufacturer operation Password: fixed:___________

Permissions: Allows users to modify all CUSTOMER PRAMETER, the NEW USER PIN, some
MANUFACTURER PARAMETER, MANUFACTORY SALES PASSWORD.
5. Calibrate Password: fixed:___________
Permissions: Allows users to calibrate currents in CALBR PARAMETER.

6. Super Password: fixed:___________

Permissions: Allows users to modify TOTAL RUN TIME,PHASE SEQUENCE PROTECTION,
OPWER FREQUENCY ,TIME LIMIT after user enter factory parameter and verify supper password.

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2, Controller Function and Technical Parameter
1, Digital input&output: 3 points of digital input ;5 points of digital relay output ;
2, Analog input: 1 point of Pt100 temperature input ; 1 point of 4～20mA pressure signal input; two groups of
three phases current inputs(CT provided）；
3, Input voltage of phases:380V/220V；
4, Compressor protection of high operation voltage and low operation voltage
5, Controller power supply: AC16-28V、50/60HZ、0.3A、5VA（recommend 10VA）
6, Measurement:
①、Discharge air temperature:-50～150℃；Accuracy:±1℃.
②、Operation time: 0～999999 hours.
③、Current:0～999.9A.
④、Pressure: 0～1.60MPa. Accuracy: ±0.01Mpa.
7,Phase sequence protection: When compressor is at stop mode and detects wrong phase sequence, respond
time≤1s (optional)；
8, Open phase protection: When compressor is at stop mode and detects open phase ,respond time≤1s
9, Motor protection: This controller has the following basic protection function for main motor and overload
protection for fan.
①、Open phase protection：When any phase opens, the respond time equals to set time, when phase open
time is set above 20s,open phase protection is invalid；
②、Unbalance protection: when MAX-MIN >= SET*MIN/10 ,respond time is 5s；
③、Protection features of overload (time unit: second)，please see following table（table 2.1.1），multiple

＝Iactual／Iset ,motor operates with delay time according to overload multiples and operation time

shown in following table (table 2.1.1) when motor working current is higher or equal to the set current
from 1.2 times and 3.0 times .

Iactual/Iset
≥1.2 ≥1.3 ≥1.5 ≥1.6 ≥2.0 ≥3.0
Time parameter

Response time（S） 60 48 24 8 5 1

Table 2.1.1 curve table for protection of motor

10, Temperature protection: when actual temperature measured is higher than temperature set; response
time≤2s；
11, Contact capacity of output relay: 250V,5A；Contact endurance : 500000 times
12, Current error is less than 1.0%.；
13, RS485 communication function
1, Block mode control
2, Communicate with-external devices as slave through MODBUS RTU, baud rate 9600BPS,1start bit,8
data bits,1 stop bit and even parity
14, Remote control compressor: When set as remote control mode, user can remotely control the compressor.

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3, Model and Specification

1, Model Description

MAM 860（B）（T） （V）（40）

Max work current match with motor

With voltage detection& protection
With RS485 communication
Pressure converter

860 controller
Series

2, Power consumption Table for Corresponding Motor

Parameter Corresponding
Current range
main motor Remark Description
(A)
Specification power (KW)
MAM860（20） 8～20 Below 11 Fan has three
MAM860（40） 16～40 11-18.5 levels of current,
MAM860（100） 100 22-45 such as 0.2-2.5A,
MAM860（200） 200 55-90 1-5A and 4-10A,
MAM860（400） 400 110 determined-by
With CT current of motor
MAM860（600/5） 600/5 200-250
Table 3.2.1 Power consumption specification sheet for corresponding motor

- 13 -
4, Installation
1, Mechanical Installation
① Current transformer installation
The CT shall be installed at a place where the current of motor cable can be measured, thus controller
can be set according to instructions on motor nameplate, the detailed dimensions is shown as below:

Figure 4.1.1. Structure dimensions of CT1（ф36 through hole） Figure 4.1.2. Installation dimensions of CT1

A
B

Figure 4.1.3. Structure dimensions of CT2 (ф10 through hole) Figure 4.1.4. Installation dimensions of CT2

- 14 -
② Controller installation
A certain room should be left around controller for wiring. The specific dimension is shown as below:

Figure 4.1.5 Controller structure dimension

Figure 4.1.6 Hole size

- 15 -
 2, Electrical Wiring Installation

、 △

21 20 19 11 12 13 14 15 16 17 18

22 23 24 25 26 27 28 29 30 31
C1
10 9 8 7 6 5 4 3 2 1

uc ub ua
a
b CT2

c
A A
RS-485 B CT1
B
FG
C

Figure 4.2.1 Terminal arrangement diagram

Cable connection of controller：

1 Common terminal for digital 2 Input terminal for emergency 3 Input terminal for remote
input stop signal control signal ( on/off )
4 Input terminal used to detect 5 N/A 6 RS485+
oil filter
7 RS485- 8 Terminal for ground 9 Terminal for the AC20V
connection power source
10 Terminal for the AC20V 11 N/A 12 N/A
power source
13 Common terminal for digital 14 Terminal to control fan 15 Terminal to control load valve
output
16 Terminal to control delta 17 Terminal to control star 18 Terminal to control main
contactor contactor contactor
19 Input terminal to detect the 20 Input terminal to detect the 21 Input terminal to detect the
phase sequence and voltage phase sequence and voltage phase sequence and voltage
22 Power terminal for pressure 23 Input terminal to receive 24 Terminal for motor CT1
sensor pressure sensor signal input
25 Terminal for motor CT1 26 Terminal for motor CT1 input 27 Terminal for fan CT2 input
input
28 Terminal for fan CT2 input 29 Terminals for fan CT2 input 30 Terminal for discharge air
temperature sensor
31 Terminal for discharge air
temperature sensor
Note :Electromagnetism coil shall be connected nearest with RC snubber during wiring

- 16 -
5, Control Process

1, Single Machine

1, working principle (On/off mode: Local; Load mode: Auto)

①. Press “ ”to start: (Y-△start)
The air compressor can not be started by pressing “ “ until 5 seconds self checking finished. The
start process of compressor is as followed: 18 terminal closed, KM2 is energized;17 terminal
closed ,KM3 is energized → Y start → STAR DELAY time starts record; when Y-△transfer time
over,17 terminal open ,KM3 is de-energized and 16 terminal closed,KM1 is energized → motor
operates in △ . (KM1 and KM3 are interlocked)
②. Automatic operation control:
A, When motor enter delta status, LOAD DELAY starts, controller will load automatically after
LOAD DELAY.
B, If air pressure is detected higher than UNLOADING P set,15 terminal opens, loading valve is
de-energized, and air compressor starts unloading, and also starts EMPTY LONG STOP time record ,if
unloading time exceed EMPTY LONG STOP set, compressor will enter STANDBY mode; if
compressor loading again within “EMPTY TIME” set(when pressure is below LOADING P or
receiving load command),compressor will reset “EMPTY LONG STOP”.
C, In STANDBY mode, controller start automatically if pressure detected is below LOADING P
③. Manual loading/unloading operation under automatic status
A: When air pressure is between LOADING P and UNLOADING P, press “loading/ unloading” to
switch the current status of controller.
B, When air pressure is above the UNLOADING P, controller unloads automatically, the
loading/unloading button is invalid
C, When air pressure is below the UNLOADING P, controller loads automatically, the
loading/unloading button is invalid
④. Normal stop:
Press “ ” , the loading magnetic valve will be de-energized, after a while of delay (stop delay),
all output relay stop working.
⑤. The frequent starting control
Air compressor can not start again immediately after NORMAL STOP ,EMPTY LONG STOP or
FAILURE STOP. It can start again after START DELAY.

2, Remote Automatic Control (Control Mode: Remote; Load Mode: Auto)

In this mode, compressor can be turned on or off by remote control .

1, Local Control (Control Mode: local, Load Mode: Manual)

A, Control of start and stop are same as automatic control, but device is in status of unloading after finish
starting process.
B, In unload status, press “ ” to load . When air pressure is higher than UNLOADING P set, the device
will unload automatically.
C, If not press “loading/ unloading”, the device will run unload until EMPTY LONG STOP.
D, In load status, press “ ” to unload.
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 2, Net Work
①.Controller works as slave when communication mode is set as “computer”, and communicates with
monitoring center through MODBUS.
②.Controller and other controller can block work when communication mode is set “block” but the master
only can service as 1# compressor.

3, Fan Operation
When discharge air temperature is higher than FAN START T, fan operates; when discharge air
temperature is lower than FAN STOP T, fan stops.

6, Alarm Function

1, Air Filter Alarm

The monitor displays AIR LIFE END when the running time of the air filter exhausts.

2, Oil Filter Alarm

①. Oil filter block check.
The monitor displays OIL BLOCK by checking pressure differential switch operating state.
②. Oil filter alarm
The text displays OIL LIFE END when running time of the oil filter exhausts.

3, O/A separator Alarm

The text displays “O/A LIFE END” when running time of the O/A separator exhausts.

4、Lubricating Oil Alarm

The text displays LUBE LIFE END when running time of the lubricating exhausts.

5, Grease Alarm
The text displays GREASE LIFE END when running time of the grease exhausts.

6, Belt Alarm
The text displays BELT LIFE END when running time of the belt exhausts.

7, High Discharge Air Temperature Alarm

The text display HIGH TEMPERATURE when controller detects the discharge air temperature higher
than ALARM T set data in MANUFACTORY PARA.

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7, Controller Protection

1, Motor Protection
MAM-860 air compressor controller provides overload, open phase, current unbalance, high voltage, low
voltage protection for motor and overload protection for fan
Electronic
Failure Display Reason
failure
Overload, bearing wear and other mechanical
Overload Display “MOTOR/FAN OVER LOAD”
failure
Power supply, contactor and open phase of
Open phase Display “MOTOR OPEN PHASE”
motor
Poor contact of contactor, inside open-loop of
Unbalance Display “MOTOR-UNBLANCE”
motor
High
Display “HIGH VOLTAGE” High supply voltage
voltage
Low
Display “LOW VOLTAGE” Low supply voltage
voltage

2, Protection of High Discharge Air Temperature

When discharge air temperature is above the high limit of set temperature, the controller will send out the
alarm to shut down the machine and This fault displays HIGHT T.

3, Protection of Air Compressor Non-reversing

When compressor stops and three phases sequence is not in order, THIS FAULT displays PHASE
REVERSAL, and the controller cannot start the motor. Change the position of any arbitrary two-phase
power lines and check the rotation of motor.

4, Protection of High Pressure

When the discharge air pressure is above the MAX LIM P, the controller will send out the alarm to shut
down the machine and THIS FAULT displays HIGH P.

5, Protection of Sensor Failure

When pressure sensor or temperature sensor is disconnected, the controller will send out the alarm to shut
down the machine and THIS FAULT displays **SENSOR FAULT.

6, Low Temperature Protection

When discharge air temperature is below LOW T PRO in manufacturing parameter, THIS FAULT displays
P SENSOR FAULT two minutes after compressor turns on, the controller will send out the alarm to shut
down the machine.

8, Troubleshooting

1, This Fault Review

Failure stop caused by the external parts of controllers may be removed by checking THIS FAULT or
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 HISTORY FAULT , method is shown as below:
Press “ ”to move the cursor to “RUN PARAMETER” menu, then press “ ” , the secondary
menu would be prompted out:

MOTORS /FAN CURRENT

TOTAL RUN TIME
THIS RUN TIME
CLR LIFE TIME

HISTORY FAULT
PROD DATE NO.
THIS FAULT
COM STATUS.
Move cursor to THIS FAULT press “ ” to switch to the following menu:

STOP:T SENSOR FAULT

0170℃

User can reset the error according to the following information

2, Common Failures and Causes

Failure Reason Solution
High temperature of Check the vent condition and lubricant
Bad vent condition, Oil shortage etc.
discharge air amount etc.
Temperature Sensor
Cable off or PT100 failure Check the wiring and PT100
Failure
Check the pressure and the pressure
High Pressure Pressure too high or the pressure sensor failure
converter
Pressure Sensor Cable off, Sensor failure or the cable connect Check the wiring and pressure
Failure reversed converter
Power open phase or the contactor terminal
Open Phase Check the power and contactors
failure
Voltage too low, tubes block, bearing wear off
Check the set data, voltage, bearings,
Overload or other mechanical failure or wrong set data
tubes and other mechanical system.
etc.
Power unbalance, contactor failure or the Check the power, contactor and the
Unbalance
internal open loop of the motor motor
Wrong Phase
Reversed phase sequence or open phase Check the wiring
Sequence
Master start time set to less than the star delta Reset the master start time to be longer
Overload during start
delay time than star delta delay + 2 seconds
Check the wiring; if the coil of
Main Contactor The emergency button loose, controller reset by
contactor connect with surge absorber
shakes frequently interference
or not

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 9, Block mode control and net work
1, Block mode control
① Block control explanation
MAM860 controller can block operate with MAM series compressor (with communication function).16 pcs
compressors are allowed in the net at most. The cable connection for block mode control is as below....

............

A B A B A B A B A B

一号机
Master 二号机
Slave Slave Slave Slave
No.1 No. 2 No. 3 No. 4 No. N
Picture 9.1.1
Compressor with net communication address 0001 is master, others are slave. Any one MAM series
compressor can be set as master or slave.
② Block mode setting
1. Set as master:
In main menu, press “ ” to enter select menu and choose USER PARAMETER, press “ ” and switch
to the menu below:

SET P,T.
SET TIME
OPERATION MODE
BLOCKING MODE

Move the cursor to OPERATION MODE, press “ ” to switch to the menu below.

ON/OFF MODE：REM
LOAD MODE ：AUTO
COM MODE ：BLOCK
COM ADD ：0001

Set COM MODE as BLOCK,COM ADD as “0001”,return to the previous menu ,move the-cursor to
BLOCKING MODE press “ ” to switch to the menu below

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 BLK STATE:MASTER
ALTER TIME：0002H
BLK NUMER.：0004
BLK MIN：00.62MPa

BLK MAX：00.78MPa
BLK DELAY：0020s

According to user requirement, set BLK STATE as MASTER, set ALTER TIME, BLK NUMER,BLK
MIN,BLK MAX,BLK DELAY according to user’s need .After-setting ,controller-needs to be powered off and
restarts to the setting.

2, Set as slave:
When MAM controller serves as slave ,it is only necessary to set COM MODE as BLOCK mode, set COM
ADD from2-16 with sequence according to the quantity of compressors, .BLK STATE set as SLAVE.
1, Start, stop block control:
Make sure block cables connect correctly and the parameter of compressors in net set correctly. Activate master,
master controls the compressors in net automatically according to the air pressure detected . Block control stops
at the same time when manually stop the master so master will no longer send command to compressor in net .

Discharge air TEM: 78℃ ◇

◇ Blinking icon indicate master
Air pressure: 0.53MPa
has activate block mode function
NORMAL STOP 0s
C16 remote control

2, Block communication receiving and sending message:

The message received and sent by RS485 can be displayed by the corresponding indication screen which is
convenient for customer to make sure if they have received and feedback data in BLOCK mode or COM MODE.
The method to switch to communication menu is as below: press “ ” in main menu and enter main menu
and select run parameter and move down the cursor to communication menu, press “ ” and switch to the
COM MODE menu as below

RX：—
TX：—

When controller receives data, RX “— ”and“*”display alternately, When sends data, TX:“— ”and“*”display
alternately. When controller is in block control or communicates with monitoring center ,user can confirm the
establishment of communication through this menu.
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2.Net Work
MAM860 controller supports MODBUS RTU protocol and can serve as slave when connect with other equipment
and supports 03、06、16 MODBUS command. Communication baud rate: 9600BPS, 1 start bit, 8 data bits, 1 stop
bits and even parity. For MODBUS register address, please see MODBUS communication manual.

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10.Schematic Diagram

21 20 19 11 12 13 14 15 16 17 18

22 23 24 25 26 27 28 29 30 31
C1 Disc T

10 9 8 7 6 5 4 3 2 1
uc ub ua
a
b
c
A A
RS-485 B
B
FG
C
AIr P

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