E6581531
M-1
13
13. Before making a service call
- Trip information and remedies
13.1
Trip causes/warnings and remedies
When a problem arises, diagnose it in accordance with the following table.
If it is found that replacement of parts is required or the problem cannot be solved by any remedy described in the
table, contact your supplier.
[Trip information]
Error
code
Description Possible
causes
Remedies
QE
*
QER
Overcurrent
during
acceleration
•The acceleration time
CEE
is too short.
•The V/f setting is improper.
•A restart signal is input to the
rotating motor after a momentary
stop, etc.
•A special motor (e.g. motor with a
small impedance) is used.
•Manual torque boost value (
XD
) is large.
•Increase the acceleration time
CEE
.
•Check the V/f parameter setting.
•Use
WX
(Auto-restart) and
WXE
(Regenerative
power ride-though control).
•Increase the carrier frequency
EH
.
•Decrease
XD
setting value.
•Decrease
H
(stall prevention level) to 110
as a guide.
QE
*
QER
Overcurrent
during
deceleration
•The deceleration time
FGE
is too
short. (in deceleration)
•Increase the deceleration time
FGE
.
QE
*
QER
Overcurrent
during fixed
speed
•The load fluctuates abruptly.
•The load is in an abnormal
condition.
•Reduce the load fluctuation.
•Check the load (operated machine).
[Note]
QER
,
QER
,
QER
originate from
causes other than those
mentioned above.
•A main circuit elements is defective.
•Overheat protection is activated.
•Make a service call.
•Check operation of cooling fan.
•Check cooling fan control mode parameter
H
.
*
QEC
U-phase arm
short-circuit
•A main circuit elements is defective
(U-phase).
•Make a service call.
*
QEC
V-phase arm
short-circuit
•A main circuit elements is defective
(V-phase).
•Make a service call.
*
QEC
W-phase arm
short-circuit
•A main circuit elements is defective
(W-phase).
•Make a service call.
QEN
Loaded side
overcurrent at
start time
•The insulation of the output main
circuit or motor is defective.
•The motor has too small
impedance.
•The drive circuit board in the
inverter was damaged.
•Check the cables and wires for defective
insulation.
•Selection of short circuit detection at starting
parameter
H
.
•If this error message appears when a motor is not
connected to the inverter, the inverter itself may
be faulty, so make a service call.
QET
Dynamic braking
element
overcurrent
(110kW or
larger)
•PB-PC/+ circuit is shorted.
•A resistor with resistance smaller
than the minimum allowable
resistance is connected.
•Parameter
RD
was set to
or
without connecting regenerative
brake or with wire disconnected
(with dynamic braking).
•Check the impedance wiring for the resistor, etc.
•Make a service call.
•Check if regenerative brake is connected.
•If regenerative brake is not necessary, set
parameter
RD
to
.
QJ
Overheating
•The cooling fan does not rotate.
•The ambient temperature is too
high.
•The vent is blocked up.
•A heat generating device is
installed close to the inverter.
•The thermistor in the unit is
disconnected.
•Restart the operation by resetting the inverter
after it has cooled down enough.
•The fan requires replacement if it does not rotate
during operation.
•Secure sufficient space around the inverter.
•Do not place any heat generating device near the
inverter.
•Make a service call.
QJ
Thermal trip
stop command
from external
device
•An input signal is impressed at
control input terminal PTG for
optional add-on cards.
•A thermal trip command (input
terminal function:
or
) is
issued by an external control
device.
•The motor is overheated, so check whether the
current flowing into the motor exceeds the rated
current.
*
In the event one of the error codes
QER
to
QER
and
QEC
to
QEC
appears, in which case a main
circuit component has most probably failed, the only way to reset the inverter is to turn power off and back on.
(Continued overleaf)
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