SJ700
2
Inverter
T
roub
leshooting
and Maintenance
6–9
OPE / SRW
Display
Name
Description
Troubleshooting and
Corrective Action
E23.-
Gate array
communica-
tion error
If an error occurs in the communication
between the internal CPU and gate array,
the inverter will trip.
•
Check for the noise sources located near
the inverter (remove noise sources).
•
Check whether the communication cable
has been disconnected (check the connec-
tors).
GA.COM
E24.-
Phase loss
input protec-
tion
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.
•
Check for the phase loss power input.
(check the power supply input wiring).
•
Check the MCB and magnetic contactors
for poor contacts (replace the MCB and
magnetic contactors).
PH.fail
E25.-
Main circuit
error (*6)
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.
•
Check for the noise sources located near
the inverter (remove noise sources.)
•
Check the main circuit element for
damage. Check the output circuit for a
short circuit (check the IGBT).
•
Check the inverter for abnormality (repair
the inverter).
Main.Cir
E30.-
IGBT error
(*7)
If instantaneous over-current occurs, the
main circuit element temperature is
abnormal, or the main circuit element
drive power drops, the inverter will turn
OFF its output to protect the main circuit
element. (After tripping because of this
protective function, the inverter cannot
retry the operation.)
•
Check the output circuit for a short circuit
(check the output cables).
•
Check for the ground fault (check the
output cables and motor).
•
Check the main circuit element for
damage (check the IGBT).
•
Check the heat sink for clogging (clean
the heat sink).
IGBT
E35.-
Thermistor
error
The inverter monitors the resistance of the
thermistor (in the motor) connected to the
inverter’s [TH] terminal, and will turn
OFF the inverter output if the motor
temperature rises.
•
Check whether the motor temperature is
high (check the motor temperature).
•
Check whether the internal thermistor of
the motor has been damaged (check the
thermistor).
•
Check whether noise has been mixed in
the thermistor signal (separate the therm-
istor wiring from other wirings).
TH
E36.-
Braking error
When “01” has been specified for B120
Brake Control Enable, the inverter will
trip if it cannot receive the braking confir-
mation signal within B124 Brake Wait
Time for Confirmation after the output of
the brake release signal.
•
Check whether the brake has been turned
on and off or not (check the brake).
•
Check whether the wait time (B124) is
too short (increase the wait time B124).
•
Check whether the braking confirmation
signal has been input (check the wiring).
BRAKE
E37.-
Emergency
stop (*8)
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 turn OFF the
inverter output and display the error code
shown on the left. The malfunction is due
to incoming noise when EMR terminal is
not ON.
•
Check whether an error has occurred in
the external equipment since the
emergency stop function was enabled.
(recover the external equipment from the
error.)
•
Check for the noise sources located near
the inverter (remove noise sources).
EMR
E38.-
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:
A high frequency may be recorded
as the error history data.
•
Check whether the motor load is too high
(reduce the load factor).
OL-LowSP
