Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
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7.46. Motor Amps (08.00-R)
Up to three sensors that measure amperage input can be specified per circuit. If used a safety condition based
upon Setpoints #75 HI AMPS and #76 LO AMPS, plus the associated Full Load Amps (FLA) for that circuit will
be checked. If a safety trip occurs, that circuit will be placed in a safety hold state.
7.47. Custom display description of circuit (08.00-R)
Instead of displaying the circuit number in the status screens of both the Magnum and MCS Connect, up to 3
characters can be supplied using MCS-Config to replace the circuit number. For example, if 1-A is entered for
circuit 1, then 1-A will be displayed in place of 1. This provides the user additional flexibility in describing a
particular circuit.
7.48. User Logic RO Delay Before Off (08.00-R)
A timer delay before turning off a relay has been added, providing the ability to keep a relay on for a period of
time after the condition to turn it off is met.
7.49. Additional Information Messages (08.00-U)
The messages generated when manually changing the status of a Relay Output or Sensor Input have been
expanded. The messages now indicate which relay or sensor was changed and if the change was from
AUTO to MANUAL or MANUAL to AUTO.
7.50. Pump Rotation (08.01-C)
Pump rotation functionality has been added. This is specified with Setpoint #106 LEAD PUMP. If the Setpoint
is active and its value is zero, then rotation will occur with each on/off cycle of the pump.
7.51. Process Pump Addition and Rotation (08.01-C)
The number of process pumps has been expanded to two and rotation functionality has been added. This is
specified with Setpoint #197 LEAD ProcPmp. If the Setpoint is active and its value is zero, then rotation will
occur with each on/off cycle of the process pump.
7.52. MOP Control Option to EXV Logic (08.01-G)
Maximum Operating Pressure (MOP) has been added to the EXV control logic. If Setpoint #199 MOP TARG
PSI is active then MOP logic will be activated. Refer to section 7.43 on Electronic Expansion Valve Control
Logic.
7.53. Delta Temperature Evaporator (08.01-G)
If Setpoint #202 DELTA TEMP EVP is active and the delta temperature across the evaporator is greater than
the value of this Setpoint the unit will not increase wanted capacity.
7.54. Condenser Low Ambient (08.01-O)
When a compressor is started its discharge pressure will be used as the controlling pressure for five minutes,
enabling that compressor to build head pressure. However, if Setpoint #204 COND LOW AMB is active and
there is an ambient temperature sensor reading less than this Setpoint, then this compressor’s discharge
pressure will remain in control for an additional time as specified in the “Time (sec)” field.
7.55. New Pressure Sensor Supported (08.01-V)
Two pressure transducers developed by Huba Control designed refrigeration industry. These are the HB-350
and the HB-700.
7.56. Centrifugal Vane Control (08.01-C)
Vane control now can be based on either a vane position or compressor amp draw Sensor Input.