Protective and Diagnostic Functions
7-
3
Main Circuit Undervoltage
The main circuit DC voltage is below
the Undervoltage Detection Level
(L2-05).
200 V class: Approx. 190 V
400 V class: Approx. 380 V
Main Circuit MC Operation Failure
The MC stopped responding during
Inverter operation. (Applicable
Inverter Capacities
200 V class: 37 to 110 kW
400 V class: 75 to 300 kW)
• An open-phase error occurred at the
input power supply.
• A momentary power loss occurred.
• The wiring terminals for the input
power supply are loose.
• The voltage fluctuations in the input
power supply are too large.
• A fault occurred in the inrush cur-
rent prevention circuit.
Reset the fault after correcting its
cause.
Control Power Fault
The control power supply voltage
dropped.
---
• Try turning the power supply
off and on.
• Replace the Inverter if the fault
continues to occur.
Inrush Current Prevention Circuit
Fault
Overheating occurred in the inrush
resistor.
The MC did not respond for 10 s after
the MC ON signal has been output.
• The MC in the main circuit failed.
• The MC excitation coil is burned
out.
• Try turning the power supply
off and on.
• Replace the Inverter if the fault
continues to occur.
Main Circuit Voltage Fault
The main circuit DC bus voltage oscil-
lates unusually (not when regenerat-
ing).
• An open-phase occurred in the input
power supply.
• A momentary power loss occurred.
• The wiring terminals for the input
power supply are loose.
• The voltage fluctuations in the input
power supply are too high.
• The voltage balance between the
phases is bad.
Reset the fault after correcting its
cause.
(
)
Cooling Fin Overheating
The temperature of the Inverter's cool-
ing fin exceeded the setting in L8-02
or 105
°
C.
OH: The temperature exceeded the
setting in L8-02 (Stopping method can
be changed by L8-03.).
OH1: The temperature exceeded
105
°
C (Stopping method: Coast to
stop).
The ambient temperature is too high.
Install a cooling unit.
There is a heat source nearby.
Remove the heat source.
The Inverter's cooling fan has stopped. Replace the cooling fan. (Contact
your sales representative.)
Inverter's Cooling Fan Stopped
The Inverter's cooling fan has stopped.
Motor Overheating Alarm
The Inverter will stop or will continue
to operate according to the setting of
L1-03.
The motor has overheated.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the motor temperature
input at terminal A2.
Table 7.1 Fault Displays and Processing (Continued)
Display
Meaning
Probable Causes
Corrective Actions
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