Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
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the suction pressure reaches Setpoint #61 “PMP DWN OFF” or the time has exceeded Setpoint #62
“PMP DWN DELY”. The compressor will then move to the CMP ANTICYCE state.
CMP ANTICYCE (4) 6.2.5.
This state is entered when the UNLD and PMPDWN state has been completed. The compressor will stay
in this state with all compressor points off for the period of time contained in Setpoint #59 “ACYC OFF->
ON” or Setpoint #63 “ACYC ON -> ON”, whichever is longer. The compressor will then move to the OFF
state. NOTE: “ACYC ON -> ON” can be used to set the maximum number of compressor starts per hour.
CMP OFF/READY (5) 6.2.6.
This state is entered when no capacity is required from this compressor, or the last state was CMP
ANTICYCE, LOST I/O LOCKED, or SWITCHED OFF. In this state the compressor is ready to provide
capacity if needed. The compressor will remain in this state for a minimum of 60 seconds.
OIL PMP LUBING (6) 6.2.7.
Screw, centrifugal, and compressors with external oil pumps all use this state. This state is used to ensure
proper oil flow prior to compressor startup. Options that affect this state are setup in Compressor
Information button under the MAG V8 screen and in the Setpoints screen:
In this state the following Relay Outputs, if present, are set as follows:
1. Compressor relay(s) are OFF.
2. Oil pump is ON.
3. If suction group running is either 1 or 2 the hot gas
solenoid is OFF.
4. Fast unloader is ON.
5. First 120 seconds or until the unload switch is ON
the unloader is ON else it is OFF.
6. Loader is OFF.
7. VI increase and decrease are OFF.
8. Start unloader is OFF.
9. Low discharge superheat relay is OFF.
10. All liquid line solenoids are OFF.
11. Oil equalization relay is ON.
12. All unloaders are OFF if they are load type else
they are ON.
13. All turbo ice relays are off.
14. Oil heater is controlled to maintain oil temperature.
All of the following conditions must be met within the time allowed in Setpoint #41 “LUBE DELAY”. If the
compressor type is centrifugal an additional 10 seconds will be allowed for these conditions to be met.
1. Oil differential must be equal to or greater than the value in Setpoint #40 “LUBE OIL PSI”. If this
Setpoint is not active this test is bypassed.
2. Oil temperature must be equal to or greater than the calculated oil temperature target. If Setpoint
#39 “LUBE OIL TEMP” is not active this test is bypassed. If the compressor type is centrifugal
and the option to use the saturated temperature is indicated, then the value of the saturated
temperature will be added to Setpoint #39 “LUBE OIL TEMP”, else the value of Setpoint #39 will
be used by itself as the calculated oil temperature target.
3. The compressor must be unloaded. If there is an unloaded indicator it must be on. If it is a
centrifugal compressor, it is forced to stay in this state for minimum of 15 seconds. If the
compressor has no unloaded indicator it must stay in this state for a minimum of 10 seconds less
than Setpoint #41 “LUBE DELAY”.
If all of these conditions are met within the allotted time, the compressor will move to another state.
If a fixed step compressor with an external oil pump the state will either be UNLOADED or
LOADED, depending if there are multiple compressor steps.