Emerson VSG & VSSG Specifications download pdf (Page 134)

11 – 20

Section 11 • Alarms, Trips, Status Information & Troubleshooting

Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM

Troubleshooting

IF THE COMPRESSOR WILL NOT START

In order to initiate a start at the compressor, make sure all permissives to initiate a start are met.

To initiate a start, the following conditions must be met:

• Control Power is ON (Emergency Stop button is not pressed and Master Control Relay is energized, indicated by

pilot light on front of panel)

• No Active Trips

If a start has been initiated and the compressor has not started, it is in standby mode. When in standby mode, the

status banner will indicate the condition that is preventing the compressor from starting.

IF CONTROL POWER WILL NOT TURN ON

If unable to turn on control power/reset an emergency stop, check the following conditons:

To energize the Master Control Relay, the following conditions must be met:

• Compressor PLC Panel must be supplied with 120VAC power.

• “Master Power” Selector Switch must be ON

• Local Emergency Stop pushbutton (mounted on PLC enclosure door) must be pulled out.

• DC power supplies must be powered up and functional, “DC OK” Relay must be energized.

• Compactlogix processor must be powered up and functional, “PLC OK” Output must be ON.

• Optional/External Emergency Stop Devices are not tripped.

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Emerson VSG & VSSG Specifications Page 134