Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
146
# Name Description
39 LUBE OIL TMP The oil must reach this temperature before the system will move out of the LUBE state. If the
oil temperature is below this value before the compressor begins its startup sequence,
the circuit will be placed in the OFF-LO OIL TMP state.
‘Time (sec)’ field: If in LUBE state, the compressor type is centrifugal, and this field is equal to
0 then the calculated oil temperature shut down is the saturated suction temperature plus
the value of this Setpoint, else it is simply the value of this Setpoint. This option is
selected in in the ‘Lube State Oil Setpoint’ box in the ‘Compressor Information’ panel
under the MAG V8 screen.
40 LUBE OIL PSI The oil must reach this pressure differential between low and high oil pressure before the
circuit will move out of the LUBE state.
41 LUBE DELAY This is the maximum time that a compressor can be in the LUBE state. When this time is
exceeded, an alarm is generated and the compressor is locked out. Both the oil
temperature and pressure must be satisfied before the LUBE state will be exited. Refer
to the OIL PMP LUBING state.
42 HI WATER TMP If active, the control sensor’s value will be compared to the value of this Setpoint. If it exceeds
this temperature for the time specified in the ‘‘Time (sec)’ field’ a HI WATER TMP alarm
will be generated. No lockouts will occur. This alarm will repeat if the control value drops
.5° below this Setpoint and then rises above it again.
43 CENT P-DWN FLA Only used for centrifugal compressors. If active, this will be the threshold for ending the pump
down state (can either be number of amps or vane percentage, depending on the
compressor control method). If the Setpoint is inactive then the FLA Setpoint for that
compressor will be used.
44 CENT P-DWN TMR Only used for centrifugal compressors. This is the maximum time allowed in the pump down
state. NOTE: This value is used whether the Setpoint is active or inactive.
45 CND STG1 ON
(RO Type)
When the discharge pressure is above this value, turn on the first stage of the condenser
fans.
‘Time (sec)’ field: (Applies to compressors with shared condensers) If non-zero, then the
compressor in startup state will not be in sole control of the condenser fans, it will control
off of highest discharge pressure. If zero, then compressor in startup will have sole
condenser control for 5 minutes. This option is selected in in the ‘Newly started Comp
Controls Common Fan Bank’ box in the ‘Condenser Information’ panel under the MAG
V8 screen.
46 CND STG1 OFF
(RO Type)
If stage 1 of condenser capacity is on and the discharge pressure drops below this value,
then turn this stage off.
47 CND DIFF ON
(RO Type)
Differential pressure added to Setpoint #45 to set the threshold at which each additional
stage of condenser capacity will turn on.
48 CND DIFF OFF
(RO Type)
Differential pressure added to Setpoint #46 to set the threshold at which each additional
stage of condenser capacity will turn off.
CND ADJ DELAY
(Modulating Type)
If active this is the time in seconds between condenser adjustments to the AO. If inactive,
then 30 seconds will be used as the delay.
If type is DELAY: (required for condenser relay delays).
-MIN VFD Opening cell contains the time delay between turning on a relay and moving
the AO to its minimum position (Setpoint #52).
-MAX VFD Opening cell contains the time delay between turning off a relay and moving
the AO to 100%.
DUAL PSI DELTA
(Dual V8)
Minimum difference in pressure before the second stage of condenser capacity can be
started.
49 CND MIN RUN
(RO Type)
Once a condenser stage has been turned on, it will remain on for at least the amount of
minutes specified in this Setpoint.
DUAL TIME DELAY
(Dual V8)
Time delay once the pressure difference in Setpoint #48 has been reached before the
second condenser stage can be started.
CND START %
(Modulating Type)
If active, then the value is the starting % for the AO when the RO that is tied to it turns on.
The value in the “Time (SEC)” cell is the AO starting stage. If no Relays are used when
CMP starts set value.