Troubleshooting
Polycold Cryochiller
Remote Monitor Troubleshooting
Installation and Operation Manual
Brooks Automation
10-14
214072 Revision B
Bit 15
Thermal Overload
Fault LED Amber
Compressor OFF
Absolute difference between
PT2 and PT1 < 137.9kpa (20
psi) for 20 seconds
Alarm 1
30 min to restart compressor
OR
“Aux” contact pair on the Contac-
tor is 1 (open), and contactor is
programmed to be 0 (closed)
Alarm L1
Wait 30 minutes to clear
Check input power and load.
Check for cause of thermal
overload
Check the contactor operation.
Check the “Aux” contact set on
the Contactor
Bit 16 Not used
N/A
N/A
Bit 17 Not used
N/A
N/A
Bit 18 Not used
N/A
N/A
Bit 19 Not used
N/A
N/A
Bit 20
Buffer Valve Cycle Count
Fault LED Amber
Compressor ON
Buffer Valve cycle count has
exceeded limit
CRYO_VALV_OPEN_CNT
for Buffer Valve >
VALVE_CYCLE_WARN.
Alarm L1
Contact authorized service
Bit 21
Cylinder Unloader Valve Cycle
Fault LED Amber
Compressor ON
Cylinder Unloader Valve Cycle
Count has exceeded limit
CRYO_VALV_OPEN_CNT
for Cylinder Unloader valve >
VALVE_CYCLE_WARN
Alarm L1
Contact authorized service
Bit 22
Cool Valve Cycle
Fault LED Amber
Compressor ON
Cool Valve Cycle Count has
exceeded limit
CIRC_VALV_OPEN_CNT
for Cool valve >
VALVE_CYCLE_WARN
Alarm L1
Contact authorized service
Bit Mask Value / Problem
Possible Cause
Corrective Action
