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Errors (Alarms)
3.1 Errors (Alarms)
If any fault has occurred in the power regeneration common converter, the corresponding protective function is
activated and the error (alarm) indication appears automatically on the LED display.
When the protective function is activated, find the cause and take proper action.
If an alarm stop has occurred, the power regeneration common converter must be reset to restart it.
zWhen the protective function is activated, take the corresponding corrective action, then reset the power
regeneration common converter, and resume operation.
zResetting method
When the protective function is activated and the power regeneration common converter has stopped its output,
the inverter output is also shut off. Unless reset, the protective function of the power regeneration common
converter cannot be deactivated. To reset, use either of the following two methods: switch power off once, then on
again; short the reset terminal RES-SD for more than 0.1 seconds, then open.
( CPU alarm may be reset only by switching power off, then on again.)
If RES-SD are kept shorted, the LED shows .
3.1.1 Error (alarm) definitions
(1) Major faults
(2) Minor fault
LED
Display
Name Description Check Point
Overcurrent protection
The current of the power regeneration
common converter module exceeded the
specified value. (Detected only in the
regeneration mode.)
Check for sudden acceleration/
deceleration.
Check for sudden load change.
Check for incorrect wiring.
Check for occurrence of instantaneous
power failure.
Main circuit device
overheat
The main circuit device overheated.
Check that the cooling fan is not at a stop.
Check for operation under overload.
Check for too high ambient temperatures.
Overvoltage protection
The bus voltage (voltage across terminals
P/L+ and N/L-) of the power regeneration
common converter fell to or below the
specified value.
Check for sudden deceleration.
Check for sudden load change.
Electronic overcurrent
protection
Thermal protection of power regeneration
common converter module.
Check for operation under overload.
Undervoltage
The bus voltage (voltage across terminals
P/L+ and N/L-) of the power regeneration
common converter fell to or below the
specified value.
Check for a start of large-capacity motor.
Phase failure
A phase failure occurred in the input power
supply.
Check for incorrect wiring.
CPU alarm
The operation of the built-in CPU did not
end with the predetermined time.
An alarm was detected in the memory
circuit or A/D converter of the power
regeneration common converter.
Contact your sales representative or
distributor.
Instantaneous power
failure alarm
An instantaneous power failure of more
than 15ms and less than 100ms occurred.
When an instantaneous power failure of not
less than 100ms occurred, the same
operation as in power-on reset is
performed.
Find the cause of instantaneous power
failure.
Power supply alarm
The power supply frequency fell out of the
specified value.
Phase detection could not be made at
power-on.
Check for incorrect wiring.
LED
Display
Name Description Check Point
Fan fault
(400V class only)
The cooling fan stopped due to a fault. Check the cooling fan for a fault.