SC No. Level Error Name/Error Condition/Major Cause/Solution
SC547-01 D
Zero-crossing error (adhered relay contact)
When the fusing relay is in an OFF state, a "zero-crossing interrupt
request" occurs in 50 ms.
Damaged fusing relay (adhered contact)
• Turn the main power OFF and then ON.
• Replace the harness.
• Replace the PC board.
• Replace the PSU.
SC547-02 D
Zero-crossing error (bad relay contact)
If a "zero-crossing interrupt request" does not occur when the fusing relay
is in an ON state, an error results.
• Damaged fusing relay (open contact)
• Failed fusing relay drive circuit
• PSU fuse (24VS) blown
• Turn the main power OFF and then ON.
• Replace the harness.
• Replace the Engine Board.
• Replace the PSU.
• Replace the fuse.
SC547-03 D
Zero-crossing error (low frequency error)
The number of zero-crossing interrupts does not reach a certain value in
500 ms.
The frequency of the commercial power supply line is unstable.
• Turn the main power OFF and then ON.
• Check the commercial power supply line.
• Replace the harness.
• Replace the Engine Board.
• Replace the PSU.
6. Troubleshooting
130
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