Brooks Polycold MaxCool Series - Page 198

Troubleshooting Polycold Cryochiller
HMI and Observed Errors Installation and Operation Manual
Brooks Automation
10-8 214072 Revision B
LQD LINE START TEMP
NO RECOMMENDATION
Fault LED is Amber
Cooling water flow and / or
temperature are outside of
acceptable limits during system
start
This fault will occur during
startup if the system coolant sen-
sor fails to reach a temperature
below 42 C within 14 seconds.
Check your temperature and
flow to ensure it is within
acceptable limits.
THERMAL OVERLOAD
NO RECOMMENDATION
Fault LED is Amber
Motor thermostat has tripped Contact authorized service.
CB1 has tripped Check for cause of excessive
thermal load on the cryocoil,
Check if supply voltage is below
nominal conditions.
If application has a combination
of high load, near max rating
and supply voltage is below
93% nominal, have a qualified
electrician rewire CB2 to
“Excepted Wiring”.
See Appendix C: CB2 Excepted
Wiring.
C1 COOL VALVE CYCLE
C2 COOL VALVE CYCLE
NO RECOMMENDATION
Fault LED is Amber
Cool valve requires replacement Contact authorized service
C1 DEFR VALVE CYCLE
C2 DEFR VALVE CYCLE
NO RECOMMENDATION
Fault LED is Amber
Defrost valve requires replace-
ment
Contact authorized service
Problem / HMI Display Possible Cause Corrective Action