Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
162
# Name Description
225 CLLC LEVEL
TARGET
Condenser Liquid Level Control level target.
The safety time is dead band + and -.
226 CLLC VALVE
TARGET
‘Safety Time’ is normal delay between valve adjustments.
Time to bypass safety test is delay when in startup or unstable.
Time to extend safety time is ADJ % if AO valve.
227 CLLC MAX ROC Condenser Liquid Level Control max ROC both + & -.
228 Force On Oil
Recovery
If active, this Setpoint force compressor ON for oil, if more than 1 compressor in a group is
needed then the safety time is delay.
The ‘Value’ is compressor current run time in minutes.
The safety time is time between turning on multiple compressors.
Time to bypass or extend safety time is not used.
The max adj is time that a compressor is in ON OIL RECOVERY state.
Extend safety test time is on time to force off ready compressor to on.
229 CHK VALVE FLT If active, when the compressor is off, test the difference between discharge & suction psi.
This safety is to determine if a check valve has failed; when triggered an error message
with “CHK VALVE FLT” and the circuit that has the problem will be generated and the
entire unit will be locked out.
Value: The pressure difference.
Time (SEC): The safety delay; SEC to Ignore Safety cell contains the time in seconds that the
compressor must be off before the safety test is made.
230 MAX DIFF PSI ROC If active, this Setpoint helps with Low Suction/Unsafe Suction trips in EXV Logic.
Value field: Maximum Differential Pressure Rate of Change before forcing a change to the
EXV position (Suggested value of 10 PSI).
‘Time (sec)’ field: Seconds between samples used for calculating the Rate of Change
(Suggested value of 15 seconds).
‘Safety Down Time(min)’ field: Minimum delay between EXV adjustments (Suggested value
of 10 seconds).
‘Sec. to Ignore Safety’ field: Delay after compressor start before adjusting the EXV based on
the Maximum Differential Pressure Rate of Change (Suggested value of 300 seconds).
‘Window to Extend Safety Time(sec)’ field: Adjustment multiplier to the EXV (Suggested
value of 1).
‘Safety Time Extension (sec)’ field: Adjustment divisor to the EXV (Suggested value of 20).