Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 27)

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

· Filter Differential Pressure Safety Changeover

– This timer bypasses the Hi Run Filter Differen-

tial Pressure setting during start, to allow the

Hi Start Filter Differential Pressure to protect

against High Filter Differential during start. Af-

ter the timer has cycled, the Hi Run Differential

Pressure Safety is active.

· Low Oil Separator Level Bypass Timer – This

timer bypasses the low oil level switch for mo-

mentary drops in the oil level. If the switch is still

open after the Low Oil Separator Level Bypass

Timer has timed out, the compressor will be shut

down and an alarm will be displayed. This timer

is available if the unit is equipped with a low oil

separator float switch. The oil level switch is

standard on all liquid injection units and optional

on all others.

· Auto Restart After Power Failure – This timer

forces the microprocessor to wait for the set

time period after a power failure before start-

ing the compressor unit. By staggering the

time settings, the compressors can be allowed

to start automatically, one at a time, after a

power failure. This prevents excessive loads on

the power system that could be caused by all of

the equipment coming online at the same time.

The Power-Up Auto Start operator option must

be selected on the Setup screen for this option

to be active.

· Oil Separator Temperature Safety Changeover

– This timer allows Low Oil Separator Start

Temperature Safety setpoint to protect the

compressor against cold oil during starting.

After the timer has cycled, the Low Oil Separator

Run Temperature is then active.

· Low Oil Injection Temperature Bypass – This

timer bypasses the Low Oil Injection Tempera-

ture Safety Setpoint during start-up. After the

timer cycles, the Low Oil Injection Temperature

Safety is set.

· Hot Starts / Hr Counter – This counter counts

compressor starts. After every start, a one-hour

timer is reset and starts timing. If the timer

times out, the hot starts counter is reset. When

the counter reaches it’s preset value, it will not

allow another compressor start until the one-

hour timer times out and resets the counter.

In other words, the hot starts counter will be

reset when the time between compressor starts

total one hour. This counter allows repetitive

compressor starts, but once the counter has

reached its set point, it requires a one-hour

window between compressor starts in order

for the counter to be reset. Note: if this option

is chosen an arrow will appear alongside its

current value. When active a point will appear.

· True Anti-Recycle Timer – Once the compressor

turns off, the timer will keep the compressor

off for the setting of True Anti-Recycle Timer.

This timer is used to prevent short cycling of the

compressor. Note: if this option is chosen an

arrow will appear alongside its current value.

When active a point will appear.

· Accumulative Anti-Recycle Timer – This timer

also forces a specified time between compres-

sor starts. When the compressor starts, the

timer resets then starts timing and accumulates

running time. Once the compressor shuts

down, it will not be allowed to restart for the

remainder of the time left on the Accumula-

tive Anti-Recycle Timer. Unlike the True Anti-

Recycle Timer, if the compressor has run for a

time period that exceeds the setpoint of the

Accumulative Anti-Recycle Timer, then when

the compressor shuts down, it will be allowed

to restart immediately. The compressor restart

options (Hot Starts or Anti-Recycle Timers) are

selected from the Setup screen. One additional

Anti-Recycle Timer that can be selected from

the Setup screen is the Modified Anti-Recycle

Timer. Note: if this option is chosen an arrow

will appear alongside its current value. When

active a point will appear.

Compressor Timer Setpoints

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Emerson VSG & VSSG Troubleshooting Guide Page 27

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