Hitachi America, Ltd. RCU SERIES
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5.3 Fault Codes
When RCU fault occurs, the Fault LED on the keypad will be lit. According to the fault states,
fault code is displayed such as below. When Fault occurs, Reset should be performed by DI5.
Fault
Code
Function
Fault Description
F 01
Overload Protection
Occurs after 100% for 100sec, 150% for 30sec
F 02
Over current
Protection
Occurs at approx, 200% of the current on power side (Protected by Software)
F 07
Over voltage
Protection
Threshold at approx, 800 VDC
F 21
Overheating
Protection
Protected by thermistor at overheat condition(95
℃
)
F 22
Short Circuit
Protection
Detects over current and protects RCU by hardware
F 25
External Emergency
Input Signal
Fault generated by external input signal
F32
AC Supply Open
The RCU detects no, or under voltage at the AC line terminals
F 35
Phase Imbalance
Protection
Imbalance between phases (R, S, T) exceeds 2%.
Table 5.1 Fault code / Fault Description
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