10 Troubleshooting
10 - 4
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
Overload
protection
*1
This function monitors the inverter output
current and, if the built-in electronic thermal
function detects a motor overload, causes
the inverter to shut off the output and
display an alarm .
The inverter trips depending on the
electronic thermal function settings.
E05.
Is the load too heavy? (Reduce the load
rate.)
Is the thermal level correct?
(Adjust the thermal level to an
appropriate level.)
*2
Braking
resistor
overload
protection
This function causes the inverter to shut off
its output and display an alarm if the usage
rate of the regenerative braking circuit
exceeds the value set in b090.
E06.
Is there any rapid deceleration?
(Increase the deceleration time.)
Is the operation cycle frequent?
(Increase the operation cycle time.)
Is the usage rate setting of the
regenerative braking function too low?
(Set it to an appropriate level.)
*3
Overvoltage
protection
Extremely high DC voltage between P/+2
and N/– may result in a fault.
This function therefore causes the inverter
to shut off its output and display an alarm if
the DC voltage between P/+2 and N/–
exceeds the specified level due to
regenerative energy from the motor or an
increase in the incoming voltage during
operation.
The inverter trips when the DC voltage
between P/+2 and N/– reaches
approximately 400 VDC for 200-V class,
and 800 VDC for 400-V class.
E07.
Is there any rapid deceleration?
(Increase the deceleration time.)
Is there any ground fault? (Check the
output wires and the motor.)
Is the motor rotated from the load side?
(Reduce the amount of regenerative
energy.)
EEPROM
error
*4
*5
The inverter shuts off the output and
displays an alarm if an error occurs in the
built-in EEPROM due to external noise or
abnormal temperature rise.
*6
E08.
Is there any large noise source around?
(Take measures against noise.)
Is the cooling efficiency reduced?
(Check the fin for clogging and clean it.)
(Replace the cooling fan.)
*1. The inverter will not accept the reset command until approximately 10 seconds after the occurrence of a trip
(specifically, after activation of the protection function).
*2. The electronic thermal function is likely to work at 5 Hz or lower. Therefore, if the load inertial moment is large,
the overload protect function will be activated during acceleration to prevent the inverter from accelerating
further. In this case, increase the torque boost or take other measures for adjustment.
*3. Pay attention to the allowable power of the resistor.
*4. The reset operation is not accepted if an EEPROM error occurs. Turn off the power supply once. If E08 is
displayed when turning on the power supply again, it is possible that the memory element is broken or the
parameters are not stored correctly. Perform user initialization to reset the parameter settings.
*5. If this occurs, the inverter will not accept the reset operation via the terminal RS or the STOP/RESET key. Turn
off the power supply once.
*6. This may result in a CPU error.
Name Description
Alarm
code on
Digital
Operator
Check and remedy
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