Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
160
# Name Description
COMP SURGING
(Only CENT)
(HVAC 08.02E1 or
Greater
Formerly #141)
The number of surges allowed before a safety trip occurs. Surges can either come in the form
of sudden amperage or lift changes.
The amp draw rate of change difference for the compressor is recorded over a period of time,
not to exceed 60 seconds. When change exceeds the value in Setpoint #210 “AMP
SurgeROC”, it is counted as a surge. This rate of change difference can be either a
positive or negative value.
The lift pressure rate of change is the difference between discharge and suction pressure for
the compressor recorded over a period of time, not to exceed 60 seconds. When change
exceeds the value in Setpoint #211 “LiftSurgeROC”, it is counted as a surge. This rate of
change difference can be either a positive or negative value.
210 ECO LL3 D-SHT
(Only HVAC)
If active and the economizer liquid line solenoid is controlled on percentage (not last
step), then a low discharge superheat test is added before checking whether the
solenoid should be turned on or not.
If discharge superheat is less than this value plus Setpoint #84 “LO DISC SHEAT”, then
the solenoid will simply be turned off.
AMP SurgeROC
(Only CENT)
Refer to Setpoint #209 “COMP SURGING”.
211 NO OIL FLOW
(Only HVAC)
If active and there is an Oil Flow sensor specified in the ‘Oil Flow Switch’ cell of the
Circuit SI screen, then the Magnum will test for oil flow. If the No Oil Flow sensor
reading is OFF (Digital) or falls below the value of this Setpoint (Analog) for the specified
period of time, then a safety trip occurs.
LiftSurgeROC
(Only CENT)
Refer to Setpoint #209 “COMP SURGING”.
212 COMP SPD FLT
(Only HVAC)
If active and there is an Compressor Speed Fault sensor specified in the ‘Compressor
speed fault’ cell of the Circuit Base screen, then the Magnum will test for
Compressor Speed Fault whether the compressor is running or not. The fault sensor
can be either an analog or digital input. If the fault sensor reading is ON (Digital) or falls
below the value of this Setpoint (Analog) for the specified period of time, then a safety trip
occurs.
SurgingCount
(Only CENT)
This Setpoint is used to take preventive action to avoid a safety trip from excess surges.
If the number surges exceed this value within the time in seconds of Setpoint #213
“SurgingTime”, then the compressor speed will increase and the vain will close and
the compressor state will change to UNIT LOADING-VFD.
213 PROC LOW FLOW
(Only HVAC)
If active and process pump differ. is less than this Setpoint, then a safety trip occurs.
SurgingTime
(Only CENT)
Refer to Setpoint #212 “SurgingCount”.
214 NO OIL FLOW
(Only CENT)
If active and there is an Oil Flow sensor specified in the ‘Oil Flow Switch’ cell of the
Circuit SI screen, then the Magnum will test for oil flow. If the No Oil Flow sensor
reading is OFF (Digital) or falls below the value of this Setpoint (Analog) for the specified
period of time, then a safety trip occurs.
215 COMP SPD FLT
(Only CENT)
If active and there is an Compressor Speed Fault sensor specified in the ‘Compressor
speed fault’ cell of the Circuit Base screen, then the Magnum will test for
Compressor Speed Fault whether the compressor is running or not. The fault sensor
can be either an analog or digital input. If the fault sensor reading is ON (Digital) or falls
below the value of this Setpoint (Analog) for the specified period of time, then a safety trip
occurs.
‘SEC to Ignore Safety’ field: delay before adjusting the EXV on TurboCor compressors on a
common suction group, allowing the system to stabilize before making an adjustment.
216 LIS MOTOR TEMP
If active, and motor temperature is greater than this value then Liquid injection solenoid
(LIS) is ON. If it is less than this value minus the ‘Time (sec)’ field of this set point
then the LIS is OFF.
‘Time (sec)’ field: Offset of motor temperature to turn LIS OFF.