4.5 - GREEN MACHINE
™
- North America - Installation, Operation, Maintenance, & Troubleshooting Manual
Chapter 9: Replacement Procedures
Page 161
9.3.2.2
Replacing the Solid State Relay
•
See Figure 9-9.
1. Install the new solid-state relay, sliding it down into place onto the bottom screw.
2. Using a screwdriver, reinstall and tighten the top screw and tighten the bottom
screw.
3. Reinstall the wires to the appropriate contacts. The bottom VDC wires must be
installed as show in
Figure 9-9
because of polarity.
4. Close the Control Panel door and lock the 2 metal clasps on the right-hand side of
the Control Panel.
5. Remove locks and tags from lockout tagout.
6. Turn the Power Switch to the ON position.
7. If there is an alarm on the Main Screen, refer to Vacuum Pump Alarm
Troubleshooting is Section 8.6.
9.4
Pressure Sensor Replacement
Safety
Use lockout / tagout procedures prior to starting work.
9.4.1
Removing the Pressure Sensor
•
See Figure 9-10.
1. Turn OFF power to the VST Control Panel at the Power Switch located on the front
of the VST Control Panel. (The power, ground, and neutral will be completely
disconnected from the GREEN MACHINE
).
2. Follow lockout & tagout procedures prior to starting work.
3. Unlock the hasps and remove the cover from the GREEN MACHINE.
4. Close the 3-way ball valve below the Pressure Sensor. (The handle is horizontal.)
5. Remove the cover from the Internal Junction Box.
6. Disconnect the 3 Pressure Sensor wires from the terminal block inside the Internal
Junction Box.
See Figure 9-11
.
7. Loosen and remove the Liquidtight conduit from the Internal Junction Box and at
the top of the Pressure Sensor. Keep for re-use. The Pressure Sensor cable will
come out of the conduit.
8. Loosen the clamp screw and remove the Pressure Sensor from the piping.
CAUTION: Use the nut on the bottom of the Pressure Sensor during removal.
9. Loosen and remove the bushing from the top of the Pressure Sensor.
Keep for re-use.
