CAMTECH/S&T/S/2009/HB/IPS/ 3.

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Chapter - 6

TROUBLE SHOOTING
6.1 General Checks

In case of malfunction, first check the following:

• All inter cell and inter tray battery connection. These connections are positive
to negative (in series) and must be securely tightened.
• Connection between battery, SMR panels, AC distribution panel and DC
distribution panel should be as per interconnection drawing provided in the
instruction manual.
• Individual cell voltage-
• In normal float : VRLA cell- 2.10 to 2.2V/cell
Conv.LA cell- 2.15 to 2.2 V/cell
• If there is more than 0.05V variation between the cell with lowest reading and
cell with highest reading, boost charge the battery for 24 hours and recheck.
• The AC input voltage of the system should be from 150V Ac to 275V AC.

If all the above connections are correct and cell voltages and AC input voltages
are within specified limits then try to rectify the fault as per troubleshooting
charts.

6.2 Troubleshooting

Since IPS systems are supplied by three different RDSO approved firms, their
indications/alarms and troubleshooting may differ slightly from one another.
Trouble shooting charts for these IPS systems are given below for the guidance
of maintenance staff.

6.2.1 Trouble shooting for IPS system of M/s Amararaja Power

Systems (P) Ltd.

Control & Supervisory Unit (CSU) Alarms

Before proceeding for troubleshooting one should be familiar with the meaning of
alarms and indications given by CSU.

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Alphanumeric display

A single line 16 characters alphanumeric backlit display with large 9 mm high

characters normally display output voltage and current as well as the system
status Float(FL) or Equalise (EQ). this is the default or “Home” screen.

10 A 123.6 V FL “Home Screen”

Fig – 1 Alphanumeric Display

Front Panel Push Buttons

There are push buttons associated with the LCD screen for the purpose of
entering different Menus and for scrolling through the menus.

The layout of the push buttons is shown below:

SMR BATT ALARM
SYSTEM OK

10 A 123.6 V FL ALARM

INC DEC ENTER SMR SHUTDOWN

Fig – 2 Front Panel push buttons

Apart from CSU or “Home” menu, which mostly include system oriented
parameters, there are three other menus which can be accessed by momentarily
pressing the relevant push buttons.

SMR Menu, which includes the rectifier related parameters as well as the output
current and heat-sink temperature for each rectifier.

Battery menu, in which all the parameters pertaining to the battery are found.

Alarm log, which stores all the individual alarm information together with date
and time starting with the most recent alarm. A total of 99 alarms are stored in
memory.

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Status Indicating LEDs

In addition to the alphanumeric display there are also three LEDs to indicate
system status as follows:
• System OK - Green
• Alarm – Amber
• SMR Shutdown – Red

When all the three LEDs are off, the unit is off and there are a number of possible
reasons for this:

• DC is not present
• Internal failure of CSU
The amber LED indicates any alarm condition, either system or rectifier related.
The Red LED indicates that one or more of the rectifiers in the system is shut
down.

A list of all the possible alarms, which can be annunciated is given in the
following table:

R = Red LED ON A = Amber LED flashing

Alarm Name Comments LED

SMR Alarm Combination of one or more SMR alarms A
SMR Alarm-Urgent One or more SMRs have shut down A+R
SMR HVSD SMR shut down due to output over voltage A+R
UNIT OFF SMR is off A+R
No Response A particular SMR is not responding to the CSU A
Power Limit SMR is in Power Limit A
SMR I Limit SMR in current limit A
Volts High Voltage measured by SMR too high A
Volts Low Voltage measured by SMR too low A
EEPROM Fail EEPROM failed (CSU or SMR) A
No Demand Control loop in SMR not in normal state A
H/S Temp High SMR heat sink temperature too high A
DDC Controller SMR DC/DC converter fault A+R
Temp Sensor Fail Temp sensor in SMR faulty - S/C or O/C A+R
Reference Fail Voltage reference in SMR microprocessor cct faulty A+R
HVDC not OK DC/DC converter (boost) voltage in SMR not OK A+R
High volts SD Shut-down of SMR due to output A+R
volts too high
AC Fail None of SMRs are responding (AC fail assumed) A+R
Temp Sensor Fail Temp sensor in MUIB not plugged in A
Battery Switch One or more battery switches open A
LVDS Open Low Voltage Disconnect switch open A

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Sys Volts High System output volts too high A

Sys Volts Low System output volts too low A
Battery Disch Batteries are discharging A
SMR Comms Fail One or more of SMRs are not responding A
AC Volt Fault AC voltage lower or higher than preset value A+R
Batt Temp High Battery temperature higher than preset limit A
Batt I-Limit Battery charging current is being limited to preset value A
Equalise System is in equalize mode A*
*not flashing
SMR ModuleTroubleshooting through alarm conditions

Some possible causes for alarms that may occur from time to time and
procedures that should be followed to clear the alarms are given in the following
table:
Alarm Condition Possible Cause Action Suggested
UNIT OFF No AC power to SMR Check AC supply to SMR; if necessary
reset CB supplying SMR
SMR faulty Replace SMR
Equalise Mode Automatic cycle in progress due to No action required
recent AC power failure
Automatic Periodic Equalise cycle in Check on CSU if system is in AUTO or
progress MAIN mode -If in AUTO mode, display will
show remaining Equalise time. Check log
for previous cycle date. If cycle too early,
replace CSU

Manual initiation of Equalise cycle

Check Operator log; in BATT menu, scroll
to “Manual Stop EQ” screen and press
ENTER to terminate cycle if necessary

SMR Alarm – If possible restore AC power

All SMRs off due to AC power failure
Urgent
Check Individual SMRs for obvious
1 or more SMRs off due to faults;
problem; replace SMRs if necessary
Replace CSU
All SMRs off due to incorrect Inhibit
signal from CSU
One or more SMRs in Current Limit Check Current Limit settings and adjust if
necessary; or batteries being recharged
SMR Warning Any of the above or non critical
problem with one or more SMRs Check SMRs
Any of the above or No Load alarm If unit is not sharing correctly, replace
SMR
Any of the above or unit is in Equalise Check Equalise/Float Mode and change if
mode in incorrect state; change SMR if CSU is
not requesting Equalise mode

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Alarm Condition Possible Cause Action Suggested

AC Fail Total AC power failure or AC voltage Check AC supply and confirm condition; If
not within operating limits AC is OK replace SMR units if only two
show alarm condition
Communications link failure Check 4-way communications cable
between CSU and all SMRs
Battery Switch Any one of 3 battery switches is open Close if appropriate
Bad connection to MUIB Repair connection
Batt Temp High Battery sensors is reporting
temperature higher than pre-set level Check battery temperatures and if
necessary increase ventilation and cooling

Set point is too low Check Batt Temp High threshold level and
re-adjust if necessary
Temperature sensor is faulty Replace sensor
Connection to MUIB faulty Repair connection
Volts High SMR fault SMR Fault Chart
One SMR in Equalise Mode Switch SMR back to Float mode
Float level set too high on CSU Check and adjust if necessary
CSU fault Replace CSU
Volts Low AC power has failed; system on battery
power Restore AC power if possible

Alarm threshold level set too high Check set point and adjust if necessary
All SMRs are off due to CSU Inhibit Check reason for signal; if necessary
signal replace CSU
Inhibit signal Replace CSU
Battery charging current limit LED on Check battery currents. If one of them
due to faulty battery current signal - this shows figure higher than Batt Chg Curr
will depress float voltage Lim set point, check corresponding current
transducer; check connections to
transducer; check MUIB connections
Battery Temperature Compensation Check battery temperature readings in
too high due to faulty battery Batt menu; Check and if necessary
temperature monitoring replace faulty sensor; check connection to
MUIB
Battery Temperature Compensation
Replace MUIB
too high due to faulty MUIB
SMR HVSD Output voltage too high due to SMR
fault Replace faulty SMR

HVSD threshold level on SMRs set too

low Check and re-adjust threshold level
CSU fault Replace CSU
SMRs not sharing Faulty CSU voltage and current control
load current loop IODEM signal Replace CSU

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Alarm Condition Possible Cause Action Suggested

Float or Equalise level on SMRs not set Check and re-adjust Float or Equalise
sufficiently high level
Float or Equalise level on CSU set too Check and re-adjust Float or Equalise
high level on CSU
No Response SMR not responding to CSU Check and if necessary replace comms
cable at back of magazine faulty
Faulty DSCC card in SMR Replace SMR
Power Limit Unit not current sharing (if only one
showing power limit) Replace SMR

Load current too high (if more than one

unit showing alarm) Reduce load

Reduce battery charging current limit if it is

too high
No Load Load circuit breakers have tripped and
there is no load Reset circuit breakers
If only one unit showing alarm, comms
line to SMR faulty Check and replace comms line

Faulty SMR Replace SMR

Current Limit Batteries being recharged if more than
one unit showing alarm No action required

If only one unit shows alarm, internal

control loop faulty Replace SMR
No Demand Internal control loop faulty Replace SMR
EEPROM Fail Faulty EEPROM or DSCC Replace SMR
DDC Controller Fault in DC/DC converter Replace SMR
H/S Temp High SMR Heat sink temperature too high.
Check that air intake by the fans into SMR
is not blocked and the fan is healthy.
Ambient temperature is too high Try to reduce ambient temperature
DSCC card is faulty Replace SMR
Temp Sensor Fail Temperature sensor is faulty Replace SMR or temperature sensor in
SMR
Reference Fail Reference voltage source in DSCC is
faulty or DSCC is faulty Replace SMR
HVDC not OK Faulty boost controller; Replace SMR
Inrush limiting fuse or resistor O/C Replace SMR
High Volts SD Feedback voltage circuit faulty Replace SMR
Temp Sensor N/A Temperature Sensor in CSU not Plug in temperature sensor if required;
attached or faulty Replace temperature sensor
Faulty MUIB connection(s) Replace MUIB
Faulty CSU card Replace CSU

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Alarm Condition Possible Cause Action Suggested

LVDS Open Battery discharged to the limit voltage
level due to no AC power Check AC voltage and reset if possible
Battery voltage OK, and CSU faulty Replace CSU
Battery voltage OK, and CSU faulty Replace CSU
LVDS threshold level set too high Reset level in BATT menu
Sys Volts High Volts High threshold in CSU set too low
Reset level to correct value
Temperature compensation coefficient Set correct temperature compensation
set too high coefficient
Faulty MUIB or CSU Replace CSU
Sys Volts Low Volts Low threshold in CSU set too
high Reset level to correct value
Temperature compensation coefficient Set correct temperature compensation
set too high coefficient
Faulty MUIB or CSU Replace CSU or MUIB
Battery Disch Output voltage low due to SMRs off Check AC voltage and restore if possible;
Float level set too low Set float level to correct value
Battery Disch level set too high Set correct Battery Disch level
Faulty control loop in CSU Replace CSU
SMR Comms Fail Comms cable faulty Replace cable
Faulty MUIB or CSU Replace CSU or MUIB
AC Volt Fault AC voltage out of tolerance Check AC voltages and fix if possible
Batt I-Limit Battery charging current is being
limited to preset value No action necessary

Battery current limit set too low Set correct limit

Battery current sensor faulty replace sensor
Alarm Condition Possible Cause Action Suggested
Faulty MUIB or CSU Replace CSU or MUIB
Batt Dis 1 Fail Check battery and repair/replace if
Battery 1 is faulty
necessary
(For all Batteries) Battery 1 current sensor is faulty Check and replace sensor if necessary
Fault y MUIB or CSU Replace CSU or MUIB

MUIB – Main User Interface Board – interface card between CSU and external
transducers/other inputs

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Troubleshooting of other modules

DC-DC Converters

Sr. Symptom Possible Cause Action Suggested

No.
I/P ON LED glowing. O/P OK LED not
glowing. But voltage is available at Test Output OK LED is Get it changed by the
1.
Points. defective. manufacturer

Over Voltage Condition Replace the faulty

2 Converter Fail LED blinks Converter.
Converter Fail , I/P ON , O/P OK LEDs
Conv. Fail LED is Get it changed by
3 glowing continuously. But voltage at test
defective. manufacturer
points is available.
Converter Fail , I/P ON , O/P OK LEDs Disconnect the load
glowing continuously in Main and Stand-by Converter output is short and check if the voltage
4 is restored. If so, check
converters. Voltage at test points is less circuited.
than 3 V. for the short in load.
Improper plugging of Insert the connectors
5 No LED glows on the front panel connectors firmly
Failure of I/P, O/P surge
Converter Fail or Converter is in Restart suppression circuit Get it changed by the
6
mode manufacturer

Inverters
Sr.
No. System fault Probable Cause Remedy

a) Skin effects due to prolong use. a) Replace fuse.

b) Short circuit or excessive b) Check Inverter O/P for excessive
1. DC Fuse fail. overload on Inverter. over loading & reduce the load to the
limit or Check Inverter Power
Transistors for short circuit & replace
defective Transistors.
DC UNDER a) DC Input Cable is less than a) Replace the cable. Use the cable of
Voltage comes rated capacity. proper rating.
2. immediately after b) Loose contact at input side. b) Tighten all connections.
Inverter is switched
ON & Inverter trips
a) Break in DC supply either due a) Replace fuse & check wiring as may
to blown fuse or disconnected be necessary.
wire.
3. Inverter not ON. b) Power Supply Transistors c) Replace them.
faulty.
c) Control card defective. d) Replace control card.
4. Inverter output a) Feedback loop broken. a) Check Feedback X’mer or break in
high wiring of X’mer or voltage adjust
Potentiometer.

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Sr.
No. System fault Probable Cause Remedy

b) Inverter card not functioning b) Replace control card.

properly.
c) False indication due to defective c) Check the set right O/V sensing
O/V sensing circuit. circuit.
5. Inverter trips a) Over Load trip setting not a) Set the overload tripping by means of
before loaded fully. proper. adjusting pot on the Inverter card.
Check power requirement of the load.
Switch on the load one by one after the
output reaches 220V.
6. Unit not working a) Output Fuse is blown. a) Replace the fuse.
neither on Inverter
nor on Mains.

ACDP
Sr. Symptom Possible Cause Action to be taken
No.
Inverter I/P ON LED is O/P LED is defective. Check the connections and
glowing. O/P OK LED is not change the LED.
1
glowing . But voltmeter shows
the O/P voltage.
Inv-1 Fail Indication glowing. Faulty Inverter –1 Send it for repair.
2
Inv-2 is taking the load.
Inv-1 is faulty . But Inv-2 is Contacts of Relay – 4/5 may Change Relay 4/5
3 not taking the load though not be proper.
O/P LED is glowing.
Though both inverters are in Defective Contactor ( Relay - Check if the coil is getting + 24V
4 working condition , only 4 ) or PC -1 DC to Relay - 4. If yes , Change
inverter-2 is taking the load. the Relay. If not replace the PC–1
Though both inverters are in Either Con-1 or Con-2 or both Change the defective contactor.
5 working condition , only are defective.
bypass CVT is ta he load.

6.2.2 Troubleshooting for IPS system of M/s Statcon Power Controls Ltd.

Sr. Observation Possible Cause Action suggested

No.
SMR Module
1. No output (a) Main supply may be out of Check Mains Supply. It should be within
range. specified range of 150-275V.
(b) Incoming MCB may be OFF Check MCB. If OFF, switch ON the MCB.
(c) O/P fuse may be blown Check O/P fuse. If blown off, replace the
same.
2. O/P is coming (a) Module may be working in Adjust float or boost current limit as the case
but it is low current limit may be with pre-set provided on front.
(b) Voltage adjustment may not Adjust voltage in float to 2.25 V/cell and
be proper. boost 2.3 V and 2.4V/cell for VRLA and Low
Maintenance Battery.
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Sr. Observation Possible Cause Action suggested

No.
3. O/P comes but O/P voltage setting may be high. Set voltage to proper level. Reset the push
module trips button to defeat Over Voltage which has
occurred due to transient.
4. Unit is not Modules voltage setting may be Set the voltage of individual module and
sharing current different. keep float and boost voltage of all module to
properly. same value within 0.1V with 4½ digit
multimeter.
DC-DC Converters
1. DC is not coming (a) Input connector may be Insert incoming connector properly.
loose and not inserted.
(b) Input fuse may be blown. Check fuse if fail, replace the same.
2. Converter O/P is Voltage may not be adjusted. Adjust voltage with preset provided on the
low side of the unit.
3. Converter Converter Voltage loop may be Replace DC-DC Converter.
voltage is not faulty.
settable through
preset.
Inverter Module
1. Inverter is not It may be tripping due to one of
getting ON even these causes
after lifting on (a) Input DC supply across Check 110 V DC across termination points.
the input MCB termination points is not If not available check it across terminals at
available. rear side of first PANEL. Check fuses. If
blown replace them.
(b) Input MCB inside the inverter Check input MCB, MCB -1. If tripped, put it
might have tripped. to ON position.
(c) Input fuse inside the inverter Check input fuse F1 inside the inverter
is blown. module. If blown, replace it.
(d) DC Under Voltage Check input DC voltage across the terminal
points. It should be above 98 V DC.
(e) DC Over Voltage Check input DC voltage across the terminal
points. It should be lower than 138 V DC.
(f) AC Over Voltage Check inverter output AC voltage. If
exceeding 250 V, replace driver card.
Transformer module
1. No output (a) Input connector may be Check and firmly insert the connector.
loose.
(b) Input fuse may have been Check and replace the fuse if blown.
loose.

Note: In case of further problem, module should be returned to STATCON, since any of
the SMR/DC modules need special Anti-static Set-up.

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6.2.3 Troubleshooting for IPS system of M/s HBL NIFE Power Systems Ltd.

Sr. Alarm/Indication & Fault symptom Corrective action

No. description /Probable cause
A. SMR Module
1. Mains ON Mains available but LED Replace LED.
(Indicates availability of the not glowing. Module
mains to the module) working normally.
2. Float Mode (Indicates that the System working normally Replace LED.
module is in Float Mode). This in float mode but LED not
indication glows even while the glowing.
battery is discharging. Ignore in
this condition.
3. Boost Mode (Indicates that the System working normally Replace LED
module is in Boost Mode) in boost mode but LED
not glowing.

4. DC output under voltage Audio/visual indication

(Module O/P <120 V) appears and also
Overload appears. Reduce the loads to normal
levels.
i. O/P fail appears. Refer corrective action at
Sr. No.7.
i. Overload and Adjust float voltage module
O/P fail do not appear. to specified limit using
‘Float Voltage Adj.’
potentiometer provided on
the front panel using preset
driver supplied in tool kit.
5. DC output over voltage (>130 Audio/visual indication Switch OFF O/put MCB of
V) appears; modules trips corresponding module.
and O/P fail also appears Press the o/put high reset
along with Call S&T staff push button. Fault may
indication in Status disappear on its own and
Monitoring Panel of ASM system works normally. If
room. not take a Multimeter and
connect same to test
sockets provided on front
panel then reset the push
button again by observing
the O/P voltage. If the
output voltage is beyond
130 V and module trips
again, then adjust the float
voltage adj. potentiometer
anti-clockwise 3 to 4 times
and reset the push button
again. O/P high will
disappear and reduced O/P
will come at this juncture.
Readjust the float voltage to
its specified value.

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Sr. Alarm/Indication & Fault symptom Corrective action

No. description /Probable cause
6. DC O/P Over Load (O/P current Audio/visual alarm Reduce the loads to the
is >21A) appears prescribed values.
7. Output Fail (When DC O/P is Audio/visual indication Check that O/P MCB is in
Zero or O/P MCB in OFF appears. ON condition. If fault
position) Also ‘Call S & T Staff’ persists check as follow:
indication appears in i. I/P AC voltage to
Status Monitoring Panel be brought to within
in ASM Room. specified limits.
ii. Check and remove
any short circuits at the O/P
side.
iii. Check voltage at
I/P and O/P side of MCB.
Replace if it is faulty.
8. Fan fail (When any one or both Audio/visual alarm Check if there are any
the fans fail) appears visual damages/objects in
the fan. Remove/replace if
any. Also check for visual
loose contacts if any. For
any abnormal observations
replace fan.
SMR Supervisory Control Unit
Status indications
1. Mains ON (Healthy input supply ---- ----
available)
2. Float (System is in float mode) ---- ----
3. Boost (System is in boost ---- ----
mode)
Alarms
1. Mains fail (Non-availability of Input not available to the i. switch on MCB
Mains to the rack) rack due to after checking any short
i.I/P main MCB in off circuit at input after MCB
position ii. check the Mains
ii.I/P contactor is off due and restore it
to mains out of range iii. Restore mains or
iii. I/P not available. alternative supply.
2. Float rectifier cum battery LED glows due to i. Check for any short
charger (FRBC) fail (Output 1. O/P MCB of circuit and switch on.
from any SMR is not available) module is OFF ii. -----------do------------
2. I/P MCB of
module is OFF iii. See fault condition
3. Internal fault of on modules concerned and
module. take corrective action
accordingly as described in
corrective actions described
for SMR modules above.
(A/1 -8
3. Battery/load fuse fail LED glows due to failure i. Check the cells of
of battery set and replace the
i. Battery fuse fuse.
ii. Load fuse ii. Check all loads for
any excess loads/short

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Sr. Alarm/Indication & Fault symptom Corrective action

No. description /Probable cause
circuits and replace the
fuse.
4. Battery Low Pre Alarm (Battery LED glows cautioning the Start generator.
condition ~ 50% DOD) discharge condition of the
battery.
5. Low Voltage Battery LED glows alarming non- Call S&T staff
Disconnection. (End Cell availability of battery to
Voltage 1.8 V/Cell) the loads except for Block
Tele.
6. Temp. Comp. Fail (Failure of LED glows Check sensor is properly
Temperature compensator) connected.
7. Mains out of range (Mains LED glows Restore mains within 150
beyond specified limits) VAC -275 VAC (150 V on
full load and 275 V on no-
load)
8. System Over Load (Load more i) LED glows but i. Reduce load to the
than specified value) system works normally extent that the current on
due to availability of the 110 V bus will be [(No.
redundant extra module of modules provided-1) x
If one module fails 20A]
under this condition, the ii. Take action as
O/P voltage will drop and per details under SMR
FRBC FAIL indication will module troubleshooting..
appear
9. Load Voltage High (O/P DC LED glows and the Take action as per details
from SMR is beyond particular FRBC where under SMR module
132V/138V for VRLA/LMLA this has occurred will troubleshooting.
respectively) have its output zero along
with FRBC fail indication.
10. Mains on Battery discharge LED glows due to Take action as per details
(Mains available but system (a) Output not under SMR module
working on battery discharge) available from SMR. troubleshooting
(b) Output of SMR
lower than battery
voltage.
11. 60% DOD (Battery condition at LED glows cautioning the Emergency Start
60% Discharge) discharge condition of the Generator
battery.
12. 70% DOD (Battery condition at LED glows cautioning the System Shutdown.
60% Discharge) discharge condition of the
battery.
DC-DC Converter
Status indications
1. Input ON (Input DC available to ---- ----
the module)
2. Output ON (DC output ---- ----
available)
Alarms
1. Output Fail (Output not LED glows indicating
available) output non-availability
due to

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Sr. Alarm/Indication & Fault symptom Corrective action

No. description /Probable cause
(a) Drift in output voltage a)Check the output voltage
adj. pot. adj. pot. For any physical
changes and correct the
setting.
(b) Short circuit at the (b) Remove the short
output. circuits if any on the output
side.
Inverter Module
Status indications
1. Input ON (DC input to the ---- ----
module available)
2. Output ON (AC output ---- ----
available)
Alarms
1. Output fail (Output voltage is LED glows whenever the (i) Adjust O/P volt.
less than specified limit) output voltage is below Adj. Pot.
180V AC. This can be on (ii) Reduce loads.
account of Adjust O/P volt. Adj. Pot.
(i) Drift in set value. and switch OFF/ON I/P
(ii) Voltage droop MCB.
due to overload.
LED glows whenever the
output voltage is above
180V AC.
2. Output fail LED glows whenever Restore I/P within specified
output is Zero on account limits (100V-132V). check
of for short circuit and switch
DC I/P beyond limits. ON MCB.
3. Over Load LED Glows whenever Load should not be more
load increases beyond than 100%.
110% and O/P voltage
droops.
4. Fain Fail LED glows whenever Fan Replace the fan.
fail condition.
5. Reset Switch Reset the output short Replace the switch.
circuit latch.
Transformers
Status Indications
1. Input ON ---- ----
(Input is available)
2. Output ON ---- ----
(Output is available)
Alarms
1. Output Fail (Non-availability of Indication appears (a) Reconnect
output) (a) On any loose properly.
connection. (b) Check for any short
(b) On fuse failure. circuit.
(c) Any internal (c) Replace module.
failure.

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Sr. Alarm/Indication & Fault symptom Corrective action

No. description /Probable cause
Status Monitoring Panel
1. Start Generator/Run Gen. Set Alarm and Red LED ACK. Alarm by pressing
indication appear. Battery ACK/RESET push button
discharged to 50% DOD. for audio cut-off and Start
Generator.
2. Emergency Start Generator Alarm and Red LED ACK. Alarm by pressing
indication appear. Battery ACK/RESET push button
discharged to 60% DOD. for audio cut-off and Start
Generator
3. System Shutdown Alarm and Red LED Start Generator (Alarm
indication appear. Supply continues till GENERATOR
to signals is cut off. DC is started.)
feed to DCDP will
continue. Battery
discharged to 60% DOD.
4. Call S&T Staff Alarm and Red LED Alarm can be
indication appear for any acknowledged for audio
equipment fail in IPS sub- cut-off.
modules.
5. Stop Gen. Set Alarm and Green LED Stop the D.G. Set.
indication appear when
battery fully charged on
D.G. Set.
Ferro Resonant Voltage Regulator
1. No AC Output Green Lamp OFF but I/P (a) Identify the faulty
switch in ON position due capacitor and replace.
to: (b) Remove the main
(a) One or more transformer and send for
capacitors shorted. replacement.
(b) Secondary (c) Remove over-
winding shorted. loading.
(c) Entire regulator (d) Remove short-
overloaded. circuit.
(d) Entire regulator (e) Replace Green
short circuited. lamp.
(e) Green lamp (f) Replace Green
fused. lamp holder.
(f) Green lamp (g) Check input
holder shorted. connections.
(g) No input power.
2. Low AC Output indication at Unit voltmeter calibration Calibrate from a standard
unit voltmeter not correct. Input line voltmeter or Zero
frequency below 50 Hz. adjustment.
3. Low AC Output at 50 Hz/Green (a)Capacitor open. (a)Identify capacitor and
light OFF or Dim (b)Indicating voltmeter replace.
faulty. (b)Replace.
(c)Partly overloaded. (c)Remove overloading.
(d)Input voltage below (d)Higher input of 160/150V
specified limit. required.
4. No Voltmeter indication. Green Voltmeter defective. Replace.
light ON.

SMPS based Integrated Power Supply Ver. 3.0 March 2009

Chapter-6:Troubleshooting
CAMTECH/S&T/S/2009/HB/IPS/ 3.0 16

Sr. Alarm/Indication & Fault symptom Corrective action

No. description /Probable cause
5. No Ammeter indication. Green (a)Ammeter defective. (a)Replace.
light ON but O/P volts OFF. (b)Very low load (b)Increase load.
connected.
6. Fuse at input line blowing Primary coil shorted. Replace.
repeatedly on turning on the
unit. No Green light.

SMPS based Integrated Power Supply Ver. 3.0 March 2009

Chapter-6:Troubleshooting