Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
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Compressor Speed Control 7.7.4.
Compressor speed is controlled by the associated Analog Output. The speed will only be changed after the
vanes are either completely opened (speed will be increased) or closed (speed will be decreased).
Compressor Vane Control 7.7.5.
If more capacity is needed the vanes will be opened by pulsing the Open Vane Relay Output (refer to UNIT
LOADNG-VANE state). If less capacity is needed the vanes will be closed by pulsing the Close Vane Relay
Output (refer to UNIT UNLDNG-VANE state). Vane positioning is based upon the Vane Position sensor if
specified. If no Vane Position sensor is used, then the compressor amps are used to determine vane
positioning.
Trane Purifier Purge System Interface 7.7.6.
Since many centrifugal compressors operate in a vacuum, there is an opportunity for contaminates to get into
the system from small leaks or minor servicing errors. These contaminates are classified as non-condensable
requiring a method of disposal, known as purging. Setpoint #163 “Purge Target” must be active for the system
to check for purge cycles.
(Refer to section 13 Setpoints #163, #164, and #165)
7.7.6.1. Purge Interface Setup
Under the Circuit Base screen, scroll down to the “Purge Relays and Sensors” section and enter the
requested information.
Purge Enable RO – This relay will be turned ON when a purge cycle is active, else it will be off.
Purge Solenoid RO – This relay will be turned ON once the Purge Exhaust Pump has been on for 1 second.
Purge Exhaust Pump RO - This relay will be turned ON when a purge cycle is active, else it will be off.
Purge Mode Switch SI – This input’s type must be MODE SEL SW. This is an external three-way switch that can be
set to:
OFF - in this setting the purge system will not function, the purge state will be SWITCHED OFF.
MANON - in this setting the purge state will be either M-PRG OFF if the system is not purging or M-PRG
RUNNING if a purge cycle is active.
AUTO - in this setting the purge state will be either A-PRG OFF if the system is not purging or A-PRG
RUNNING if a purge cycle is active.