Chapter 5 Error Codes
5-3
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*4 The inverter will not accept reset commands input via the RS terminal or entered by the STOP/RESET key. Therefore, turn off the
inverter power.
*5 The inverter will not accept the reset command entered from the digital operator. Therefore, reset the inverter by turning on the RS
terminal.
Name Description
Display on
digital operator
Option 1
error
The inverter detects errors in the option
board mounted in the optional slot 1.
For details, refer to the instruction
manual for the mounted option board.
Option 2
error
The inverter detects errors in the option
board mounted in the optional slot 1.
For details, refer to the instruction
manual for the mounted option board.
Waiting in
undervoltage
status
If the input voltage falls, the inverter will
shut off its output, display the code
shown on the right, and wait for the
recovery of the input voltage.
The inverter will display the same error
code also during an instantaneous
power failure.
(remark) Inverter trips with under
voltage when this status continues for
40 seconds.
Communica-
tion error
If a problem occurs in the
communication between the digital
operator and inverter, the inverter will
display the code shown on the right.
Waiting for
retry
When the retry after instantaneous
power failure or tripping has been
enabled, the inverter displays the code
shown on the right while awaiting retry
after an instantaneous power failure or
tripping.
Power-off
The inverter displays the code shown
on the right when the inverter power is
turned off.
Restricted
operation
command
When an operation direction has been
restricted by the setting of "b035", the
inverter will display the error code
shown on the right if the operation
command specifying the restricted
operation direction is input.
Empty trip
history
If the inverter has not tripped before,the
inverter displays .
Name Description
Display on
digital operator
Gate array
communica-
tion error
If an error occurs in the communication
between the internal CPU and gate
array, the inverter will trip.
Phase loss
input
protection
When the phase loss input protection
has been enabled (b006 = 01), the
inverter will trip to avoid damage if an
phase loss input is detected. The inverter
trips when the phase loss input
continues for about 1 second or more.
Main circuit
error (*4)
The inverter will trip if the gate array
cannot confirm the on/off state of IGBT
because of a malfunction due to
noise,short or damage to the main circuit
element.
IGBT error
If instantaneous overcurrent occurs, the
main circuit element temperature is
abnormal, or the main circuit element
drive power drops, the inverter will shut
off its output to protect the main circuit
element. (After tripping because of this
protective function, the inverter cannot
retry the operation.)
Thermistor
error
The inverter monitors the resistance of
the thermistor (in the motor) connected
to the inverter's TH terminal, and will
shut off the inverter output if the motor
temperature rises.
Emergency
stop (*5)
If the EMR signal (on three terminals) is
turned on when the slide switch (SW1)
on the logic board is set to ON, the
inverter hardware will shut off the
inverter output and display the error code
shown on the right.
Malfunction due to incoming noise,in
case EMR terminal is not ON.
Low-speed
overload
protection
If overload occurs during the motor
operation at a very low speed at 0.2 Hz
or less, the electronic thermal protection
circuit in the inverter will detect the
overload and shut off the inverter output.
(2nd electronic thermal control)
(Note that a high frequency may be
recorded as the error history data.)
Modbus
communica-
tion error
If timeout occurs because of line
disconnection during the communication
in Modbus-RTU mode, the inverter will
display the error code shown on the
right. (The inverter will trip according to
the setting of "C076".)
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