Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
158
# Name Description
201 MOP ADJ % TME
(Only HVAC)
The adjustment value by which the EXV valve will close each time the MOP logic calls for it to
maintain the suction pressure target. This adjustment will be made each time after the
delay in the ‘Time (sec)’ field has expired.
‘Time (sec)’ field: The delay between MOP adjustments.
LOW SI OFF
(Only CENT)
FEATURE NOT YET AVAILABLE
If active, the Magnum checks for a Low SI Off sensor for each compressor. The sensor can
be either an analog or digital input, and is specified in the Circuit SI screen. If the Low SI
Off sensor reading is OFF (Digital) or falls below the value of this Setpoint (Analog) for
the specified period of time, the circuit will be disabled. If a digital input, the circuit will be
enabled once the sensor is ON. If an analog input, the circuit will be enabled once the
sensor is greater than this value plus the value in the ‘Time (sec)’ field.
‘Time (sec)’ field: Differential value of this Setpoint which the analog input must be greater
than to enable the compressor.
202 DELTA TEMP EVP
(Only HVAC)
If active, the Magnum will check the temperature differential before additional capacity is
enabled. If the difference between entering and leaving temperature is greater than the
value of this Setpoint for the amount of time in the ‘Time (sec)’ field, then no additional
capacity will be allowed.
HI SI OFF
(Only CENT)
FEATURE NOT YET AVAILABLE
If active, the Magnum checks for a High SI Off sensor for each compressor. The sensor can
be either an analog or digital input, and is specified in the Circuit SI screen. If the High SI
Off sensor reading is ON (Digital) or rises above the value of this Setpoint (Analog) for
the specified period of time, the circuit will be disabled. If a digital input, the circuit will be
enabled once the sensor is OFF. If an analog input, the circuit will be enabled once the
sensor is less than this value minus the value in the ‘Time (sec)’ field.
‘Time (sec)’ field: Differential value of this Setpoint which the analog input must be less than
to enable the compressor.
203 HiSuctSheat
(Only HVAC)
If active, the Magnum will check for high suction superheat. If the suction superheat is
greater than the value of this Setpoint for the specified period of time, an alarm will
be generated and a safety trip occurs.
204 COND LOW AMB
(Only HVAC)
Standard condenser logic dictates that a newly started compressor will use its own discharge
pressure as the control for the first five minutes. If this Setpoint is active and the ambient
temperature sensor is reading less than the value of this Setpoint, then this compressor’s
discharge pressure will remain in control for the additional time in seconds as specified in
the ‘Time (sec)’ field.
SurgeHldDlay
(Only CENT)
The time in minutes to remain in a surge increase hold state after the occurrence of a surge.
The surge counter will be reset with each new surge. When the surge counter exceeds
this value the compressor state will move to CMP IS HOLDING state.