5-4
5-1 Protective Functions and Troubleshooting
5
Maintenance Operations
Input open
phase trip
Prevents Inverter damage due to
input phase loss when the input
phase loss protection selection is
enabled (b006=01), and trips.
Trips when the phase loss time is
approximately 1 s or more.
E24.0
Is there any input power supply phase
loss?
(Check the input wiring.)
Is there a contact failure for MCCB and/or
Mg?
(Replace MCCB, Mg.)
Main circuit
error
*1
Trips when the gate array cannot
confirm IGBT ON/OFF because of a
main element failure, a load short
circuit, or an erroneous operation
resulting from radiated electrical
noise.
E25.0
Is there any large electrical noise source
around?
(Countermeasures against electrical
noise)
Has the main element/IGBT been
damaged?
Is there any output short-circuit?
(Check the IGBT.)
The Inverter has a failure. (Repair/
Replace)
IGBT error
Shuts off the Inverter output to
protect the main element when a
momentary overcurrent,
temperature error in the main
element, or drop of the main
element driving power supply
occurs.
(Retry operation cannot be
performed for this trip.)
E30.0
Is there any output short-circuit? (Check
the output wires.)
Is there any ground fault?
(Check the output wires and motor.)
Has the main element been damaged?
(Check the IGBT.)
Is there any clogging in the fin?
(Clean the fin.)
Thermistor
error
Shuts off the Inverter output when
detecting the thermistor resistance
value inside the motor has changed
which is connected to the TH
terminal, resulting motor
temperature rise.
E35.0
Is the motor temperature too high?
(Check the motor temperature.)
Is there any damage to the thermister
inside the motor?
(Check the thermistor.)
Is there any electrical noise being
introduced in the thermister signal?
(Separate the wiring.)
2-9
4-75
Brake error
When 01 is selected in b120 (brake
control selection), this error appears
if the brake ON/OFF cannot be
confirmed within the b124 set time
(brake confirmation wait time) after
the Inverter outputs the brake
release signal.
E36.0
Is the brake ON/OFF function working?
(Brake check)
Is the set time for b124 too short?
(Increase b124.)
Has the brake confirmation signal been
input?
(Wiring check)
4-76
Emergen-
cy shutoff
*2
Shuts off the hardware output and
displays an error when the EMR
terminal (S3) is turned on with SW1
on the logic board ON.
E37.0
Did any error occur in the external
devices when the emergency shutoff
function was selected?
(Correct the external device error.)
2-9
Overload
trip in low
speed
range
If an overload is detected in the
lowest speed range of 0.2 Hz max.,
an electronic thermal trip inside the
Inverter works to shut off the Inverter
output. (2nd electronic thermal)
(However, a higher frequency could
remain in the error history.)
E38.0
Is the load too large? (Reduce the loading
factor.)
ModBus
communic
ations error
Appears when the timeout occurs
because of disconnection during
Modbus-RTU communication.
(Trip by the C076 setting)
E41.0
Is the communication speed correct?
Is the wiring distance appropriate?
(Connection check)
4-147
Name Description Error Code 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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