Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 26)

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

Compressor Timer Setpoints

· Capacity Decrease At Start – At compressor

startup, the capacity motor is held at minimum

position for this time period. After the timer

expires, the slide is free to move in accordance

to the system demands.

· Compressor Starter Auxiliary Contact Bypass –

This timer is used to bypass the motor amperage

input at start. After the timer times out, the

program determines if the motor starter has

pulled in by testing the amperage channel. If

the program determines that the starter did not

“pull in”, then the compressor will fail on “Motor

Starter Fail” message.

· Volume Slide Adjustment Timer – This timer

determines the intervals the volume slide is

adjusted. If the volume slide is between 2½% &

7% away from the desired volume ratio, the mo-

tor is pulsed once toward the desired volume.

If the volume slide is more than 7% away from

the desired value, the volume slide motor is

continuously energized until the valve is within

2½% of the desired value. If the actual position

is within 2½% of the desired value, no adjust-

ment will be made.

· Minimum Compressor Prelube Timer – This is

the length of time the oil pump will run after

establishing the Prelube Oil Pressure, to prime

oil circuit before starting the compressor.

· Oil Pressure Bypass At Compressor Start – This

timer bypasses the Low Oil Pressure limits.

The timer starts when the compressor starts.

After the timer has cycled, the Low Oil Pressure

setpoint is active.

· Prelube Oil Pump Time Limit – This timer puts

a limit on how long the prelube oil pump is al-

lowed to run without establishing the Prelube

Oil Pressure.

To change a timer set-

ting, a user with high

access level must be

logged on.

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Emerson VSG & VSSG Troubleshooting Guide Page 26

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