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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
51
F1: DC BUS VOLTAGE TOO LOW
DEFINITION
If DC bus voltage of compressor module P and N is less than 200 VDC for five seconds, relay on the main board is inoperable.
POSSIBLE CAUSES
• Abnormal power supply to power drive board
• Damaged rectifier
• Damaged DC fan motor
• Damaged power drive board or main board
• The communication wire between power drive board and main board is loose
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Fig. 58 —F1 Troubleshooting Chart
Note: Check the voltage between red and black terminals.
Note: Check whether the PFC and IPM in power drive are
shorted.
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Note: Check whether these three voltage are normal or not.
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