VST GREEN MACHINE VST-GM-CS2-101, Installation, Operation, Maintenance, & Troubleshooting Manual

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4.5 - GREEN MACHINE ™ - North America - Installation, Operation, Maintenance, & Troubleshooting Manual
Chapter 8: Troubleshooting Page 139
Troubleshooting Procedures, continued
Steps Procedures
2. Check to see if the Vacuum Pump Solid State Relay is damaged.
a) 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.
b) Follow Lockout/Tagout procedures prior to starting work.
c) Open the Control Panel front door.
d) Turn the Power Switch on the inside of the Control Panel to the ON position.
**CAUTION: You are now working in a hot panel**
e) Push the Maintenance button on the PLC touch screen.
f) Enter 878 then push the return button.
g) Push the Reset Motor Alarm button to reset the motor alarm. Without resetting the
alarm, you will not be able to do the next step.
h)
i)
Push the Manual ON button. This button runs the GREEN MACHINE which allows you to
check the voltage on each of the terminals of the solid-state relay. See the table below
for expected voltage values of each terminal.
Wire Number Terminal Location Expected Voltage
02051A Top Left to 115 VAC ground ~120 VAC
02052 Top Right to 115 VAC ground ~120 VAC
02093
05051
Bottom Left to Bottom Right ~24 VDC
05051 Bottom Right to 24 VDC ground ~24 VDC
j) If any of the voltages are not correct, check the associated breakers, fuses, and wiring
for proper connections. If the voltages are correct, go to Step m).
k) If the wiring connections are all tight, replace the relay. Note the wire numbers and
location.
l) After the relay is replaced, close the Control Panel front door. Go to Step h) to retest.
m) Turn OFF the Power Switch inside the Control Panel.
n) Close and latch the Control Panel door.
o) Turn ON the Power Switch on the front of the Control Panel and re-install the carabiner
clip. The PLC will turn ON in the Main Screen.
p) Push the Maintenance button on the PLC touch screen.
q) Enter 878 then push the return button.
r) You will now be in the Maintenance Screen.
s) The Reset Motor Alarm button will be RED. Push the Reset Motor Alarm button so the
alarm resets.
t) Push ESC on the PLC to go back to the Main Screen and the Alarm will be cleared.
u) The GREEN MACHINE is now in a Normal Operating Mode and will operate if the UST
pressure is above 0.2 IWC.
v) NOTE: IF THE VACUUM PUMP CONTINUES TO ALARM, GOTO STEP 3