5-3
5-1 Protective Functions and Troubleshooting
5
Maintenance Operations
CT error
Shuts off the output if an error
occurs in the CT (current detector)
built into the Inverter. Trips if the CT
output is approximately 0.6 V or
more when the power is turned on.
The Inverter has a failure. (Repair)
CPU error
*1
Shuts off the output and displays an
error if the internal CPU has worked
erroneously or abnormally.
Note: If an abnormal value is read
from EEPROM, it may
become a CPU error
depending on the case.
Is there any large noise source around?
(Countermeasures against noise)
The Inverter has a failure. (Repair)
External
trip
If an error occurs in the external
equipment or devices, the Inverter
receives the signal, and the output is
shut off.
(Available with the external trip
function selected)
Has any error occurred in the external
devices when the external trip function is
selected?
(Correct the external device error.)
4-82
USP trip
Appears when the power is turned
on with the RUN signal input into the
Inverter.
(Available with the USP function
selected)
When the USP function was selected, did
you turn on the power with the RUN
signal input into the Inverter? (Cancel the
RUN command and turn on the power.)
4-82
Ground
fault trip
*1
Protects the Inverter if a ground fault
between the Inverter output unit and
the motor is detected when turning
on the power.
(This function does not work when
there is residual voltage in the
motor.)
Is there any ground fault? (Check the
output wires and motor.)
Is there any error in the Inverter itself?
(Disconnect the output wires to check.)
Is there any error in the main circuit?
(Check the main circuit. Refer to Chapter
6.) (Repair)
Incoming
overvoltage
trip
Appears if the incoming voltage
continues to be higher than the
specification value for 100 seconds
while the Inverter is stopped.
Trips when the main circuit DC
voltage reaches approximately 390
V DC for 200-V class, and 780 V DC
for 400-V class.
Is the incoming voltage high while the
Inverter is stopped?
(Lower the incoming voltage, restrain the
power supply fluctuation, apply the AC
reactor to input.)
Momentary
power
interruption
trip
Shuts off the output when a
momentary power interruption
occurs for 15 ms or more.
If the shutoff time is long, it is
normally recognized as a power
shutoff. Note that, when restart is
selected, the Inverter restarts at
power-on as long as the RUN
command remains.
Has the power supply voltage dropped?
(Power recovery)
Is there a contact failure for MCB and/or
Mg?
(Replace MCB, Mg.)
4-60
Name Description
Display on
Digital
Operator
Check point and remedy
Reference
page
*1. The reset command through the RS terminal or STOP/RESET key is not accepted. Turn off the power.
*2. The reset operation via the Digital Operator is not accepted. Be sure to reset via the RS terminal.
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