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# Name Description
63 ACYC ON->ON This is the anti-cycle time delay (in seconds) from when the compressor was turned on. This value is
used in a calculation to determine how long a compressor should be in the anti-cycle state. Defi nes the
number of cycles per hour the compressor can have.
64 COMP MIN RUN This is the minimum run time (in minutes) for a compressor once it is turned on. This minimum run time
can be overridden by a safety condition.
75 HI AMPS This Setpoint is a percentage of the FLA; it is used to create the high amp draw limit. The value of this
Setpoint is multiplied by the respective compressor’s full load amps Setpoint (#171 through #190) to
obtain its upper limit. If the compressor’s amps exceed this value for the time specifi ed in this Setpoint,
then a safety trip occurs. At 50% of value above FLA the controller will start unloading to provide as
much capacity without shutting down.
76 LO AMPS NoSTART This Setpoint is a percentage of the FLA; it is used to create the low amp draw limit. The value of this
Setpoint is multiplied by the respective compressor’s full load amps Setpoint (#171 through #190)
to obtain its lower limit. If the compressor’s amps fall below this value for the time specifi ed in this
Setpoint, then a safety trip occurs. (indicates the compressor has not started. Look for a mechanical
safety that’s holding off the compressor.)
ed period of time, a safety trip occurs.
78 LO SUCT UNLD The purpose of this Setpoint is to take corrective action to prevent a low suction pressure safety trip.
For variable step compressors: If a compressor has a suction pressure less than the value of Setpoint
#77 “LOW SUCTION” plus the value of this Setpoint, then the compressor will be forced to unload.
The circuit state will be changed to LO SUCT HOLD, and will remain in this state the time defi ned in
Setpoint #101 “SAFETY HOLD DELAY”. At that time, if the suction pressure has increased greater
than the value of Setpoint #77 “LOW SUCTION” plus the value of Setpoint #79 “LOW SUCT RELD” the
compressor will return to normal control.
79 LOW SUCT RELD Refer to Setpoint #78 description.
77 LOW SUCTION If active, the Magnum checks for low suction pressure for each running compressor. If suction pressure
is less than this value for the specifi
80 UNSAFE SUCT If active, the Magnum checks for unsafely low suction pressure for each running compressor. If suction
pressure is less than this value for the specifi ed period of time a lockout occurs. NOTE: The time
period specifi ed should be very short (3 to 10 seconds). If this Setpoint trips, the compressor will be
sent straight to the Lockout state.
81 HI DISC PSI If active, the Magnum checks for high discharge pressure for each running compressor. If the
discharge pressure sensor reads greater than this Setpoint for the specifi ed period of time, a safety trip
will occur.
Refers to ‘Discharge Pressure’ column in the Circuit SI screen.
82 HI DISC UNLD The purpose of this Setpoint is to take corrective action to prevent a high discharge pressure safety
trip. For variable step compressors: If a compressor has a discharge pressure more than the value
of Setpoint #81 “HI DISC PSI” minus the value of this Setpoint, then the compressor will be forced to
unload. The circuit state will be changed to HI DISC HOLD, and will remain in this state for a minimum
of the time in Setpoint #101 “SAFETY HOLD DELAY”. At that time, if the discharge pressure has
decreased below than the value of Setpoint #81 “HI DISC PSI” minus the value of Setpoint #83 “HI
DISC RELD” the compressor will return to normal control.
83 HI DISC RELD Refer to Setpoint #82 description.
87 HI DISC TMP If active, the Magnum checks for high discharge temperature for each compressor. If the discharge
temperature sensor reading is greater than this Setpoint for the specifi ed period of time, a safety trip
will occur.
Refers to ‘Discharge Temperature’ column in the Circuit SI screen.
88 DIS TMP UNLD The purpose of this Setpoint is to take corrective action to prevent a high discharge temperature safety
trip. For variable step compressors: If a compressor has a discharge temperature more than the value
of Setpoint #87 “HI DISC TMP” minus the value of this Setpoint, then the compressor will be forced to
unload. The circuit state will be changed to HI DISC HOLD, and will remain in this state for a minimum
of the time in Setpoint #101 “SAFETY HOLD DELAY”. At that time, if the discharge temperature has
decreased below than the value of Setpoint #87 “HI DISC TMP” minus the value of Setpoint #89
“HDISC T RELD” the compressor will return to normal control.
89 DIS TMP RELD Refer to Setpoint #88 description.
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