11 - 6
11. TROUBLESHOOTING
Display Name
Definition
Cause
Action
1. Wrong setting of parameter No.
PA02
Set correctly.
2. Built-in regenerative resistor or
regenerative option is not
connected.
Connect correctly
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative option to be
exceeded.
Checking method
Call the status display and check
the regenerative load ratio.
1. Reduce the frequency of positioning.
2. Use the regenerative option of larger
capacity.
3. Reduce the load.
4. Power supply voltage is abnormal.
MR-J3- T:260VAC or more
MR-J3- T1:More than 135VAC
Review power supply
Permissible
regenerative power
of the built-in
regenerative resistor
or regenerative
option is exceeded.
5. Built-in regenerative resistor or
regenerative option faulty.
Change servo amplifier or regenerative
option.
A30 Regenerative
alarm
Regenerative
transistor fault
6. Regenerative transistor faulty.
Checking method
1) The regenerative option
has
overheated abnormally.
2) The alarm occurs even after
removal of the built-in
regenerative resistor or
regenerative option.
Change the servo amplifier.
1. Input command pulse frequency
exceeded the permissible
instantaneous speed frequency.
Set command pulses correctly.
2. Small acceleration/deceleration time
constant caused overshoot to be
large.
Increase acceleration/deceleration time
constant.
3. Servo system is instable to cause
overshoot.
1. Re-set servo gain to proper value.
2. If servo gain cannot be set to proper
value:
1) Reduce load inertia moment ratio; or
2) Reexamine acceleration/
deceleration time constant.
4. Electronic gear ratio is large
(parameters No. PA06, PA07)
Set correctly.
A31 Overspeed Speed
has
exceeded the
instantaneous
permissible speed.
5. Encoder faulty.
Change the servo motor.
1. Short occurred in servo motor power
(U, V, W).
Correct the wiring.
A32
Overcurrent
Current that flew is
higher than the
permissible current
of the servo
amplifier.
2. Transistor (IPM) of the servo
amplifier faulty.
Checking method
Alarm (A32) occurs if power is
switched on after U,V and W are
disconnected.
Change the servo amplifier.
3. Ground fault occurred in servo motor
power (U, V, W).
Correct the wiring.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression measures.
Summary of Contents for MELSERVO MR-J3-xT
Page 22: ...8 MEMO ...
Page 156: ...4 46 4 SIGNALS AND WIRING MEMO ...
Page 276: ...7 26 7 MR Configurator MEMO ...
Page 324: ...10 16 10 SPECIAL ADJUSTMENT FUNCTIONS MEMO ...
Page 418: ...14 66 14 OPTIONS AND AUXILIARY EQUIPMENT MEMO ...