Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
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The CENT V8 software will keep the last 60 seconds of samples for both amps and lift pressure. It will
calculate the last ten 1 second Rate of Changes for both amps and lift pressure. If within these 10
Rate Of Changes there is a value less than (Setpoint #220 “AmpSurgeROC” x –1) or (Setpoint #221
“LiftSurgeROC” x –1) followed by a value greater than Setpoint #220 or #221, a compressor surge
has occurred.
The software will then count the number of compressor surges that occur. If the number of surges is
more than the value in Setpoint #219 “ExcessSurges” within 5 minutes (value of Setpoint #219 ‘Time
(sec)’ field) the system will shut down and generate an “ExcessSurges” alarm. This safety condition
will automatically restart the compressor after the time in the Safety Down Time of the Setpoint #219.
If a second “ExcessSurges” occurs within the time of the Lockout Delay Field, the compressor will be
placed in “Cmp Locked Out” state and a manual reset is required to enable the compressor to restart
again.
Centrifugal Base Compressor Setup MCS-Config 7.7.2.
Similar to the HVAC V8 software the header buttons for this type of configuration file are as follows:
In the MAG CENT V8 screen the same information is required as for HVAC V8 setup. The compressor type must be
centrifugal.
The VFD for compressor speed control, VFD fault, and Vane Closed Indicator are specified in the Circuit Base screen
if they are used.
In the Circuit SI screen the sensors for the Turbine Inlet Pressure and Vane Position are specified if they are used.
For compressors with a VFD, a Vane Position sensor is required and is used for opening and closing the vanes.
For compressors without a VFD, a Vane Position sensor is optional. If unspecified then the amp sensor is used for
opening and closing the vanes. In the above example the Vane Position sensor is not specified; therefore, the vane
control will be based upon amp draw.
Typical Relay Output Setup 7.7.3.
Typical setup of a centrifugal compressor: