Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 7)

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

Operational Flow Charts

Volume and

Capacity slides are

less than 5 %.

Requirements to Start Compressor

Oil Separator Temp

> Oil Sep Start

Trip

Setpt.

Filter Diff Press <

Start

Filter Diff

Trip Setpt

Oil Pump On: Prelub Oil Press is > Prelub Oil

Press Reset Setpt for “Min Compressor Prelub

Timer” setting (Default 7 Seconds)

Start Compressor

Critical Compressor Run Logic @ Compressor Start

Run Oil Press >

Run Oil Press

Reset

setpt?

(Default 40 PSI)

Run Oil Press Failure

“Filter Diff Press Safety

Changeover” timer expires

(60 sec after start).

Filter Diff < Hi Filter

Diff Press Run Trip

setpt?

Oil Separator Temp

Safety Changeover

Timer expires. (5 min

after start)

Oil Sep Temp > Lo

Oil Sep Run Reset

setpt:?

Run

Run Filter Diff Press Failure Lo Run Oil Sep Temp Failure

Yes

Yes Yes

Yes

Compressor Amperage Load Limiting

High Disch Pressure Load Limit

Motor Amps >

FLA (ON

)

Setpt?

Motor Amps >

Max (OFF

)

Setpt?

Normal Loading &

Unloading

Capacity Decrease

until Amps < FLA x

1.0625

Normal Loading &

Unloading

Capacity Decrease until

DischPress < ON Setpt x

1.0625

Disch Press >

Cutin (ON

)

Setpt?

Disch Press >

Cutout (OFF

)

Setpt?

Yes

Capacity INC Disabled

Start

Compressor

Prelube 5

Seconds

Satified Oil

Pressure

Compressor

Start Mode

Is Run Oil Press >

Run Oil Press setpt?

Yes

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