Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 24)

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

Compressor Alarm and Trip

· Low Suction Pressure Setpoints 1&2 – This is

the low suction pressure safety. This safety is

active in both temperature and pressure control

modes. An alarm or trip will be active on a drop

in suction pressure below the setpoint value.

· High Discharge Pressure Setpoints 1&2 This is

the high discharge pressure safety. The alarm or

trip will be active on a rise in discharge pressure

above the setpoint value.

· Low Suction Temperature – This is the lowest

allowable Suction temperature. The compres-

sor will not be allowed to run if the Suction

Temperature is below the trip setting.

· High Discharge Temperature – This is the high

discharge temperature safety. The alarm or

trip will be active if the discharge temperature

should rise above the setpoint value.

· Low Oil Separator Start Temperature – This is the

starting low oil separator temperature safety.

The compressor is prevented from starting or

running if the oil in the separator is below the

trip value. After a time delay (Oil Separator

Temperature Safety Changeover), this safety is

deactivated and the Lo Oil Separator Run Tem-

perature is the active setpoint.

· Low Oil Separator Run Temperature – This is the

running low oil separator temperature safety.

After a time delay (Oil Separator Temperature

Safety Changeover), the Lo Oil Separator Start

Temperature is bypassed and Lo Oil Separator

Run Temperature is the active setpoint. The

alarm or trip will be active if the oil temperature

of the separator drops below the setpoint value.

· Low Oil Injection Temperature – This is the low

oil injection safety. The alarm or trip will be

active if oil injection temperature drops below

setpoint value after a time delay (Oil Injection

Temperature Safety Changeover).

· High Oil Injection Temperature – This is the high

oil injection temperature safety. The alarm or

trip will be active on a rise in oil injection tem-

perature above the setpoint value.

· Low Control Temperature – This is the low

process temperature safety. The alarm or trip

will be active on a drop in control temperature

below the setpoint (only in process temperature

mode).

· High Control Temperature – This is the high

process temperature safety. The alarm or trip

will be active on a rise in control temperature

above the setpoint (only in process temperaure

mode).

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Emerson VSG & VSSG Troubleshooting Guide Page 24

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