46
Compressor Protection Module (CPM) alarms, 1.xx, 2.xx,
5.xx, or 6.xx require additional steps to reset these alarms. To
clear these alarms, first find and correct the cause of the alarm.
Then press and hold the Reset Button located on the CPM
board for 5 seconds. This action will reset only the alarmed cir-
cuit, and clear the CPM. Next, reset the alarm in the PSIO as
described above. For CPM alarms, 1.95, 2.95, 5.95 and 6.95,
first correct the configuration header problem, turn LOCAL-
OFF-REMOTE switch to the “OFF” position, then press and
hold the reset button on the unit’s control/fuse panel for 5 sec-
onds. This action removes power to the CPM, and should not
be used while another compressor is in operation. Next, reset
the alarm in the PSIO as described above.
Compressor Alarm/Alert Circuit —
Each compres-
sor is controlled by a CPM processor, which controls the com-
pressor operation. Power is supplied to the CPM logic circuit.
Table 36 — Alarm and Alert Codes
ALARM/ALERT
CODE
ALARM OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM GENERATED?
ACTION TAKEN
BY CONTROL
RESET METHOD
PROBABLE
CAUSE
0 —
No Alarms or Alerts
Exist
——— —
1.xx
See CPM subcodes
below
Compressor A1
Failure
See CPM subcodes
below
See CPM subcodes
below
Manual See CPM subcodes
below
2.xx
See CPM subcodes
below
Compressor A2
Failure
See CPM subcodes
below
See CPM subcodes
below
Manual See CPM subcodes
below
5.xx
See CPM subcodes
below
Compressor B1
Failure
See CPM subcodes
below
See CPM subcodes
below
Manual See CPM subcodes
below
6.xx
See CPM subcodes
below
Compressor A2
Failure
See CPM subcodes
below
See CPM subcodes
below
Manual See CPM subcodes
below
CPM SUBCODES
(xx)
x.0 —No Error — — — —
x.1 Alarm High Pressure Switch
Tr i p
HPS input to CPM mod-
ule open
Comp. shut down Manual/Button Loss of condenser air/ water
flow. Operation beyond chiller
capability. Liquid valve not
open.
x.2 Alarm No Motor Current CPM reads less than
10% of MTA on all legs
for >3 seconds
Comp. shut down Manual/Button Power supply disconnected,
blown fuse(s), wiring error,
contactor not energized, faulty
current toroid, check toroid
wiring
x.25* Alarm Current Imbalance
>10% (Alarm)
CPM measures current
imbalance between
phases greater than
10% for 25 minutes
Circuit shut down Manual/Button Loose terminals on power
wires. Poor power supply. Dis-
played only if current unbal-
ance alarm feature is enabled
in
x.27* Alert Current Imbalance
>10% (Warning)
CPM measures current
imbalance between
phases greater than
10% for 25 minutes
None — Loose terminals on power
wires. Poor power supply. Dis-
played only if current unbal-
ance alarm feature is disabled
in
x.3 Alarm Current Imbalance
>25%
CPM measures current
imbalance between
phases greater than
25% for 25 minutes
Circuit shut down Manual/Button Loose terminals on power
wires.
Poor power supply.
x.35 Alarm Single Phase Current
Loss
CPM measures current
imbalance between
phases greater than
50% (running current
< 50% of MTA) or 30%
(running current >
50%
of MTA) for 1 second
Circuit shut down Manual/Button Blown fuse, wiring error, loose
terminals
x.4 Alarm High Motor Current CPM detects high cur-
rent compared to MTA
setting
Comp. shut down Manual/Button Operation beyond chiller
capability, improperly
punched configuration
header, blown fuse
x.5 Alarm Ground Fault CPM detects ground
current (4.5 ± 2.0 amps)
Comp. shut down Manual/Button Motor winding(s) gone to
ground, wiring error, loose
plug connector.
x.75 Alarm Contactor Failure CPM detects min. 10%
of MTA for 10 seconds
after shutting off com-
pressor contactor. Oil
solenoid is energized.
All remaining com-
pressors shut down.
All loaders deener-
gized. Min. load
valve of affected cir-
cuit energized (if
equipped)
Manual/Button Faulty contactor, contactor
welded, wiring error.
x.8 Alarm Current Phase
Reversal
CPM detects phase
reversal from toroid
reading or from incom-
ing power supply
Circuit shut down Manual/Button Terminal block power supply
leads not in correct phase.
Toroid wire harness crossed.
Check compressor contactor.
x.85 Alarm Motor Over
Temperature
CPM detects high motor
temperature
Comp. shut down Manual/Button Motor cooling (all) or Econo-
mizer (2 comp. circuits) sole-
noid failure, low refrigerant
charge.
x.9 Alarm Open Thermistor CPM detects open cir-
cuit in motor temp
themistor
Comp. shut down Manual/Button Wiring error or faulty ther-
mistor†
x.95 Alarm Config. Header Fault CPM finds error with
MTA value punched out
in header
Comp. shut down Manual/Button Header pins on CPM board
either all or none punched
out, header not fully sealed in
CPM board.
x.10 Alarm Shorted Thermistor CPM detects short
circuit in motor temp
thermistor
Comp. shut down Manual/Button Wiring error or faulty
thermistor†
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