Emerson VSG & VSSG Software Manual page 48

Auto Button
In this mode the compressor will respond to its on-board settings for start, stop, load and
unload commands.
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%.
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.
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.
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