Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 49)

VSG/VSSG • Compact Logix PLC Manual •Vilter/Emerson • 35391CL

Start In Auto Button

In this mode the compressor will respond to its on-board settings for start, stop, load and

unload commands.

UNIT START LOCAL

START IN

MANUAL

Start In Manual Button

In this mode the compressor will respond to operator inputs from the HMI screen. They

Capacity and Volume Slide Valve Position can be adjusted by the up and down arrows that

appear on the main screen. The Position is a value 0% to 100%.

UNIT START LOCAL

START IN

MANUAL

AUTO

Remote Digital Button

The Compressor Controller must be in Local-Auto in order to activate Remote mode. In

Remote Digital Mode the compressor is controlled by digital input signals.

1. Remote Start Input: Permissive Start/Stop for the compressor.

2. Remote Increase Input: Increases the Capacity Slide Valve.

3. Remote Decrease Input: Decrease the Capacity Slide Valve.

UNIT START LOCAL

REMOTE

CAPHOLD

Remote Capacity Hold Button

From Local mode, Remote Caphold button can be pressed to put the compressor controller in

Central mode. Central mode allows for external capacity control via communications link.

Central Mode

The remote PLC must maintain the Central mode operation by setting a tag in the compressor

controller memory at least every 60 seconds. If the Central mode signal is lost during

operation, the compressor controller reverts to Local Auto mode.

Unit Start Screen (Start / Stop Logic)

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Emerson VSG & VSSG Troubleshooting Guide Page 49