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*Overcurrent
The current flowing in the converter is larger
error
than the specified value.
1) The amplifier failed (due to
defectivecircuits or IGBT parts).
2) Motor wires (U, V and W) are shorted.
3) Motor wires are grounded.
4) Motor burned
5) Poor connection of Motor wires
6) The relay for the dynamic brake ismelted
and stuck due to the frequent Servo-
ON/OFF.
7) The motor is not compatible with
theamplifier.
8) Pulse input and Servo-ON
occurssimultaneously, or pulse input
occurs faster than Servo-ON.
Alarm
Protection
Code
No.
Cause
- 81 -
1) Disconnect
the
motor
enterServo-ON. If this trouble happens
immediately, replace the amplifier with a
new one (that is working correctly).
2) Check if
the U. V and W wires are
shortedat the connections. Reconnect
them, if necessary.
3) Measure
the
insulation
between U/V/W and earth wire. If the
resistance is not correct, replace the
motor with a new one.
4) Measure the resistance between U, V
and W. If they are unbalanced, replace
the motor with a new one.
5) Check if the U/V/W connector pins
arefirmly secured with screws. Loosened
pins should be fixed firmly.
6) Replace the amplifier with a new one.
Donot start or stop the motor by entering
Servo-ON or OFF.
7) Check the capacity of the motor and
amplifier on the nameplate. If the motor
is not compatible with the amplifier,
replace it with a correct one.
8) Pulse input should occur after at
least100 ms following Servo-ON. Refer
to Appendix "Timing Chart".
Countermeasures
wires,
and
resistance
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