Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 32)

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

· Capacity Control °F Increase – The capacity of the compressor will increase when process temperature is at

or above the ON setpoint, and the increase “off” timer has cycled. Capacity will continue to increase until the

Capacity Control °F Increase OFF setpoint is reached. If closer system control is desired, set the ON and OFF

setpoints at the same values. This will essentially eliminate and difference between the ON and OFF setpoints.

Process temperature control of the capacity is active only if the Compressor Control Via Process Temperature

option is selected on the Setup screen.

· Capacity Control °F Decrease – The capacity of the compressor will decrease when process temperature is at

or below the ON setpoint, and the increase “off” timer has cycled. Capacity will continue to decrease until the

Capacity Control °F Decrease OFF setpoint is reached. If closer system control is desired, set the ON and OFF

setpoints at the same values. This will essentially eliminate and difference between the ON and OFF setpoints.

Process temperature control of the capacity is active only if the Compressor Control Via Process Temperature

option is selected on the Setup screen.

Compressor Control Setpoints

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Emerson VSG & VSSG Troubleshooting Guide Page 32