5-2
5-1 Protective Functions and Troubleshooting
5
Maintenance Operations
*1. The reset command is not accepted until approximately 10 seconds after the trip occurs (protection function
works).
*2. The reset command is not accepted if the EEPROM error
E08.0 occurs. Turn off the power once. If you find
E08 when turning on the power again, it is possible that the internal memory element of the drive has been
damaged or the parameters have not been memorized correctly. Perform the user initialization to set the
parameters again.
*3. The reset command through the RS terminal or STOP/RESET key is not accepted. Turn off the power.
Overvolt-
age trip
Extremely high DC voltage between
P/+ and N/- may result in failure. This
function therefore shuts off the output
and displays an error if the DC
voltage between P/+ and N/- exceeds
the specified level because of
regenerative energy from the motor
or increase of the incoming voltage
during operation.
Trips when the DC voltage between
P/+ and N/- reaches approximately
400 V DC for 200-V class, and 800 V
DC for 400-V class.
E07.0
Is there any rapid deceleration?
(Increase the deceleration time.)
Is there any ground fault?
(Check the output wires and motor.)
Has the motor been rotated/driven from the
load side?
(Reduce regenerative energy.)
EEPROM
error
*2 *3
Shuts off the output and displays an
error if an error occurs in the built-in
EEPROM because of external noise
or abnormal temperature rise.
Note: This may be a CPU error
depending on the case.
E08.0
Is there any large electrical noise source
around?
(Countermeasures against electrical noise)
Has the cooling efficiency been reduced?
(Check that there is no clogging in the cooling
fan and fin, if so clean it.)
(Replace the cooling fan if faulty.)
Name Description Error Code Points to check and remedy
Reference
page
Name Description Error Code Check point and remedy
Reference
page
Undervolt-
age trip
Shuts off the output if the incoming
supply voltage drops below the
specified level. This is because the
control circuit stops working
properly when the incoming supply
voltage to the Inverter drops.
Trips when the DC voltage between
P/+ and N/- drops to approximately
175 V DC for 200-V class, and 345
V DC for 400-V class.
E09.0
Has the power supply voltage
decreased?
(Check the incoming power supply.)
Is the power supply capacity sufficient?
(Check the power supply.)
Has the drives internel charge circuit
thyristor been damaged?
(Check the thyristor.)
4-28
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.
E10.0 The Inverter has a fault. (Repair/Replace)
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.
E11.0
Is there any large electrical noise source
around?
(Countermeasures against noise)
The Inverter has a fault. (Repair/Replace)
*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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