Emerson VSG & VSSG Spécifications télécharger pdf (Page 33)

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Section 2 • Operational Descriptions

Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM

Figure 2-6. Control Panel Master Power and Emergency Stop Electrical Circuit

OIL HEATERS

Immersion Heaters in the oil separator are controlled by

the compressor PLC to maintain warm oil. The heaters

cycle on and off to maintain a desired separator oil tem-

perature range.

SUCTION OIL INJECTION SOLENOID

Used on 401mm screw machines (models 2401-3001).

If installed, the suction oil injection solenoid feeds addi-

tional oil from the oil separator to compressor suction

on start. The valve is opened for a settable time after the

compressor main motor starts.

SUCTION-DISCHARGE EQUALIZING SOLENOID

If installed, the equalizing solenoid opens for a settable

time on compressor stop to equalize pressure between

suction and discharge of the compressor.

OIL DRAIN SOLENOID

If installed, the oil drain solenoid valve opens for a set-

table time on compressor stop to allow oil to drain from

the compressor. It also opens during the prelube retry

wait periods in the prelube sequence.

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Emerson VSG & VSSG Spécifications Page 33