GPS 8500/GPS 9700 Troubleshooting Voltage Issues
wc_tx000828gb.fm 29
3.11 Checking the Voltage Selector Switch (VSS)
Prerequisites
Machine shutdown
Multimeter
Procedure
Follow the procedure below to check the Voltage Selector Switch (VSS)
1. Place the VSS in the 120V position.
2. Remove the switch handle (a).
3. Remove the screws that secure the VSS (b) to the control panel.
4. Label the wires connected to the VSS.
5. Remove the wires connected to the VSS.
6. Reconnect the switch handle to the switch.
7. Check the resistance between the terminals.
Your meter should read less than 1 Ohm for closed terminals and “OL” or “OPEN”
for open terminals.
Does the switch perform as stated above?
8. Reassemble the generator.
The VSS has now been checked.
Position Closed terminals Open terminals
120 1–2; 5–6; 9–10 3–4; 7–8; 11–12
240 3–4; 7–8; 11–12 1–2; 5–6; 9–10
Yes ____ No ____
The VSS is OK. The VSS has failed; replace it.
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