51Service Manual – SC5000 04 - Control System
2-014 K2 Contact Open
Description K2 Power Module contactor did not close
Setting
Conditions
The power module did not detect power at the B+ lug when
the K2 relay was commanded to close.
When Monitored
Always
Possible Causes
• Open circuit in the relay coil
• Faulty relay
Initial Action None
Troubleshooting Steps
1. Check the voltage between the two coil terminals of the K2 relay.
− If the voltage is at or near zero volts, continue to step 2
− If the voltage is at 36 volts, proceed to step 3.
2. Check the voltage between contacts J3-2 and J3-9 at the power module.
− If the voltage is 36 volts, repair or replace the Brown wire between J3-2 and the relay.
− If the voltage is not 36 volts, replace the power module.
3. Check the voltage between the output contact of the K2 relay and the main ground lug in the electrical
bay.
− If the voltage is zero volts, replace the K2 relay.
− If the voltage is 36 volts, continue to step 4.
4. Check the voltage between B+ and B- lugs of the power module.
− If the voltage is at or near 0 volts, repair or replace the main wire between the K2 relay and the B+
lug.
− If the voltage is 36 volts, replace the power module.
2-017 Overvoltage Cutoff
Description Excessive voltage present at Power Module power supply
Setting
Conditions
When Monitored
Always
Possible Causes Faulty power module.
Initial Action
Troubleshooting Steps
The machine is battery-powered. There is no common failure that can cause the batteries to achieve a
voltage high enough to trigger this error.
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