Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 63)

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

Safety Failure Message

Oil Separator Start Temp Fail –

This message will appear when the Oil Separator Temp is below the Low Oil Separator Start Temp Trip

setpoint. In addition this message will appear after the Oil Separator Temp Safety Changeover timer times

out and the Oil Separator temperature fails to rise above the Low Oil Separator Start Temp Reset after the

compressor is started.

Oil Separator Run Temp Fail –

This message will appear when the Oil Separator Temp is below the Low Oil Separator Run Temp Reset

setpoint after the Oil Separator Temp Safety Changeover timer times out.

Percent Capacity Fail –

This message will appear if the percent capacity reading exceeds 300% or goes below –15%.

Percent Volume Fail –

This message will appear if the percent volume reading exceeds 300% or goes below –15%.

Low Control Temperature Fail –

This message will appear when the Process Control Temperature falls below the safety setting of the Lo

Control Temperature Trip Setpoint. In addition, this message will appear when the Process Control Tem-

perature rises above 300 degrees F, indicating an open RTD.

Low Start Oil Pressure Fail –

This message will appear with the Prelube Oil Pressure (Manifold minus Discharge) has remained below the

Prelube Oil Pressure Reset setpoint. The Prelube Oil Pressure must be above the Prelube Oil Pressure for a

time period of the Minimum Compressor Prelube time. It will continue to try to do this for a time period

of the Prelube Oil Pump Time Limit. When the Prelube Oil Pressure fails to achieve this, then the failure

message will occur.

Low Oil Pressure Fail –

This message will appear when the Running Oil Pressure (Manifold minus Suction) has remained below the

low Oil Pressure Reset setpoint when the Oil Pressure Bypass at Compressor Start timer times out. This

message will also appear when the Running Oil Pressure falls below the Low Oil Pressure trip setpoint after

the Oil Pressure Bypass at Compressor Start timer times out.

Low Oil Injection Temp Fail –

This message will appear when the Oil Injection temperature falls below the Low Oil Injection Temperature

trip setpoint. This message will also appear when the Oil Injection temperature fails to rise above the Low

Oil Injection Temperature reset setpoint after the Low Oil Injection Temp Bypass timer times out.

Hi Oil Injection Temp Fail –

This message will appear when the Oil Injection temperature rises above the High Oil Injection Temperature

trip setpoint.

Manifold Pressure Fail –

This message will appear with the manifold pressure rises above 300 PSI or falls below 30” Hg.

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Emerson VSG & VSSG Troubleshooting Guide Page 63