Mitsubishi Electric MELSERVO MR-J2-A Product Specifications And Installation Manual page 200

8. TROUBLESHOOTING
Alarm Code
Display
CN1B- CN1A- CN1A-
19 pin 18 pin 19 pin
A. 17 0 0
A. 18 0 0
A. 20 1 1
A. 24 1 0
A. 25 1 1
A. 30 0 0
Name Definition
0 Board error 2 CPU/parts fault
0 Board error 3
0 Encoder Communication error
occurred between
error 2
encoder and servo
amplifier.
0 Motor output Ground fault
occurred at servo
ground fault
motor outputs
(U, V, W phases)
of servo amplifier.
0 Absolute Absolute position
position erase data in error
Power was switched
on for the first time
in the absolute
position detection
system.
1 Regenerative The permissible
error regenerative
power of the
built-in
regenerative
brake resistor
or regenerative
brake option is
exceeded.
Regenerative
transistor fault
Cause
Faulty parts in the servo amplifier
Checking method
Alarm (A. 17 or A. 18) occurs if
power is switched on after
CN1A, CN1B, and CN3
connectors have been disconnected.
1. Encoder connector disconnected. Connect correctly.
2. Encoder cable faulty
(wire breakage or short)
1. Power input wires and servo motor
output wires are in contact at main
circuit terminal block (TE1).
2. The servo motor power line cover is
deteriorated, and causes earthing.
3. The main circuit of the servo
amplifier is broken.
Investigating method
Disconnect the U, V, and W power
lines from the servo amplifier, and turn
on the servo motor. A. 24 still occurs.
1. Reduced voltage of super
capacitor in encoder
2. Battery voltage low
3. Battery cable or battery is
faulty.
4. Super capacitor of the absolute
position encoder is not charged
1. Wrong setting of parameter No. 0 Set correctly.
2. Built-in regenerative brake
resistor or regenerative brake
option is not connected.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative brake option to be
exceeded.
Checking method
Call the status display and check
the regenerative load ratio.
4. Power supply voltage
increased to 260V or more.
5. Regenerative transistor faulty.
Checking method
1) The regenerative brake option
has overheated abnormally.
2) The alarm occurs after removal of
the built-in regenerative brake resistor
or regenerative brake option.
6. Built-in regenerative brake
resistor or regenerative brake
option faulty.
8– 8
Action
Change the servo
amplifier.
Repair or change
the cable.
Connect correctly.
Replace the line.
Replace the
servo amplifier.
After leaving the alarm
occurring for a few
minutes, switch power
off, then on again.
Ensure to make home
position return again.
Change battery.
Ensure to make
home position
return again.
After leaving the
alarm occurring for
a few minutes, switch
power off, then on
again. Home position
setting must be made
again.
Connect correctly.
1. Reduce the
frequency of
positioning.
2. Use the
regenerative
brake option of
larger capacity.
3. Reduce the load.
Review power
supply.
Change the servo
amplifier.
Change servo amplifier
or regenerative brake
option.