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Critical Fault - SEQ1

Display - Pre-Charge Timeout


Pre-charge operation not completed within 30 seconds PV Voltage must be >0 Vdc close DS1 DS2 DS3PV-voltage relative to existing DC-Bus (stack)voltage must be <20 Vdc to perform pre-charge(close DS1-2-3).


1. Verify PV voltage, allow DC-bus voltage to diminish(bleed-down). Reset fault on HMI, then re-start the pre-charge,closing disconnects within 30-seconds of the HMI “charging”state icon-buttons illumination.

2. Check the DC disconnect / pre-charge aux-switch (ST) wiring.

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