Bus Low-Voltage Protection; Ph Bus High-Voltage Protection - Toyotomi KURO Mini Service Manual

TOYOTOMI
Troubleshooting：
PL
Grid voltage is normal or not ?
3.4.35 ―PH‖ Bus High-Voltage Protection
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display
Error judgment condition and method:
If there is no other malfunction and the busbar voltage is higher than the set value for high voltage protection,
then it can be judged that bus high-voltage protection occurs. System will shut down for protection.
Possible reason:
■Voltage of power grid is abnormal.
■Drive board busbar voltage sampling circuit element is damaged or drive board busbar voltage sampling AD
terminal is abnormal.
Troubleshooting：

Bus low-voltage protection

YES
Replace the dr ive
board .
Bus high-voltage
PH
protection
Grid voltage is normal or not ?
YES
Replace the dr ive
board .
U-Match 5 SERIES UNIT SERVICE MANUAL
NO
Normal
protection
NO
protection
70
PH
Normal