Emerson VSG & VSSG Installation Manual download pdf (Page 52)

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VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG

Section 4 • Operation

Fail Position

The temperature control valve remains in the last posi-

tion when power is removed.

Screen Display

The oil temperature control valve, identiﬁ ed as “OIL MIX”

on the main PLC display screen, shows a numerical value

with “%” as units. This is to be understood as “% OPEN.”

It is a direct indication of the position of the ball valve.

100% OPEN

Oil ﬂ ow stream is entirely bypassing the oil cooler.

99% to 1% OPEN

Oil ﬂ ow stream is partially bypassing the oil cooler and

partially diverted to the oil cooler.

0% OPEN

Oil ﬂ ow stream is entirely diverted to the oil cooler.

Figure 4-6. Oil Temperature Control Valve (Oil Mixing Valve)

MANUAL OVERRIDE

The actuator of the oil temperature control valve has a

handwheel that can be engaged to override the electri-

cally determined position of the ball valve.

1. Push handwheel down and rotate to engage inter-

nal slot with ﬂ ats, see Figure 4-6.

NOTE

Actuator does not have mechanical stops. Do Not

rotate past open or close position. Use visual indicator

to position actuator.

2. Once engaged, push down handwheel a second

time to disengage gear train and rotate CLOCKWISE

to OPEN or COUNTER CLOCKWISE to CLOSE.

3. To return actuator to normal operation, ﬁ rst check

“% OPEN” on control panel. If value is 100%, return

actuator to OPEN position as shown on the visual

indicator. If value is 0%, return actuator to CLOSE

position as shown on the visual indicator.

Handwheel Visual Indicator

Actuator

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Emerson VSG & VSSG Installation Manual Page 52