Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
114
Low Suction Pressure
If the suction pressure drops below the value of the Setpoint or the digital input turns ON for the time
specified in the ‘Time (sec)’ field, the compressor will be locked out and a LOW SUCTION alarm
generated. This safety is bypassed when the compressor is in a Pump Down state. This safety can also
be used as a freeze protection based upon the suction pressure. When this safety trip occurs, all
compressors in the same suction group will react in the same manner. Refer to section 13 Setpoint #77.
Unsafe Suction Pressure
This safety is similar to the low suction pressure safety, except it is often set up with a lower value and a
shorter safety time. If the suction pressure drops below the value of the Setpoint or the digital input turns
ON for the time specified in the ‘Time (sec)’ field of that Setpoint, then the circuit will be Locked Out and a
UNSAFE SUCTION alarm generated. This safety will always cause a Lock Out on the first trip, requiring a
manual reset. This safety is bypassed when the compressor is in a Pump Down state. When this safety
trip occurs, all compressors in the same suction group will react the same. Refer to section 13 Setpoint
#80.
High Discharge Pressure (SAFETY IS ALWAYS CHECKED)
If the discharge pressure rises above the value of the Setpoint or the digital input turns ON for the time
specified in the ‘Time (sec)’ field of that Setpoint, then the circuit will be locked out and a HIGH
DISCHARGE alarm generated. Refer to section 13 Setpoint #81.
Low Discharge Pressure
If the discharge pressure drops below the value of the Setpoint for the time specified in the ‘Time (sec)’
field, the compressor will be Locked Out and a LOW DISCHARGE alarm generated. Refer to section 13
Setpoint #85.
High Discharge Temperature (SAFETY IS ALWAYS CHECKED)
If the discharge temperature analog input rises above the value of the Setpoint or the digital input turns
ON for the time specified in the ‘Time (sec)’ field, the compressor will be Locked Out and a HIGH
TEMPERATURE alarm generated. Refer to section 13 Setpoint #87.
High Motor Temperature or Motor Fault (SAFETY IS ALWAYS CHECKED)
If the high motor temperature input rises above the value of the Setpoint or the digital input turns ON for
the time specified in the ‘Time (sec)’ field, the circuit will be Locked Out and a HIGH MOTOR
TEMPERATURE or MOTOR FAULT alarm generated. Refer to section 13 Setpoint #95.
High Oil Temperature
If the oil temperature rises above the value of the Setpoint or the digital input turns ON for the time
specified in the Time (sec)’ field, the compressor will be locked out and a HIGH OIL TEMPERATURE
alarm generated. Refer to section 13 Setpoint #94.
High Motor Amperage
If the amperage analog input rises above the value of the compressor’s respective FLA Setpoint #171 –
190 times the value of Setpoint #75 or the digital input turns ON for the time specified in the Time (sec)’
field, then the circuit will be Locked Out and a HIGH MOTOR AMP alarm generated. Refer to section 13
Setpoint #75.
Low Motor Amperage,
If the amperage analog input drops below the value of the compressor’s respective FLA Setpoint #171 –
190 times the value of Setpoint #76 or the digital input turns ON for the time specified in the Time (sec)’
field, then the circuit will be Locked Out and a LOW MOTOR AMP alarm will be generated. Refer to
section 13 Setpoint #76.
No Compressor Proof
If a compressor is called to be on and the compressor proof digital input is OFF, a NO COMP PROOF
alarm will be generated. Refer to section 13 Setpoint #96.
High Oil Seal Temperature (Screw Compressors only)
If the oil seal temperature analog input rises above the value of the Setpoint for the time specified in the
Time (sec)’ field, then the circuit will be Locked Out and a HIGH OIL SEAL alarm generated. This safety is
bypassed when the compressor is in a Pump Down state. Refer to section 13 Setpoint #93.