Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 46)

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

3.0 Initial Position

3.1 With the electrical power to the valve de-energized, the valve is set to its initial position by ensuring that

the ball is in the closed position and that the actuator indicator displays CLOSED.

3.2 When the electrical power to the valve is energized, the valve should rotate to fully OPEN.

4.0 Operation

4.1 When initially installed, the ball must be in the closed position.

4.2 When electrically energized, if the compressor is not running, the compressor

controller will turn the valve fully open (100%).

4.3 When the compressor starts, the valve remains fully open (100%) until the oil injection

temperature rises above the control setpoint.

4.4 When the oil injection temperature rises above the control setpoint, the oil

temperature control valve will begin to close.

4.5 The hot oil from the oil separator begins to divert to the oil cooler, mixing the hot and

cooled oil flow streams together downstream of the oil temperature control valve. The

valve can fully close (0%) diverting the entire oil flow stream to the oil cooler.

4.6 As the oil injection temperature drops below the setpoint, the oil temperature control

valve begins to open so that the oil injection temperature does not become too cold.

4.7 When the compressor stops, the valve returns to fully open (100%).

5.0 Fail Position

The actuator remains in its last position when power is removed.

6.0 Screen Display

The oil temperature control valve, identified as “OIL MIX” on the main HMI 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.

6.1 100% OPEN

Oil flow stream is entirely bypassing the oil cooler

6.2 99% to 1% OPEN

Oil flow stream is partially by-passing the oil cooler and partially diverted to the oil

cooler

6.3 0% OPEN

Oil flow stream is entirely diverted to the oil cooler

7.0 Control Settings

The oil temperature control setpoints are entered on the compressor controller screen “Oil Mixing Valve

PID (Oil Return from Cooler)”.

8.0 Rotating the Actuator for Convenience of Installation

The actuator can be rotated to any one of four positions.

8.1 Remove both 120V and 24V power from the actuator.

Oil Mixing Valve

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Emerson VSG & VSSG Troubleshooting Guide Page 46