Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 104

6. TROUBLESHOOTING
Display Name
1F Encoder
combination
error
20 Encoder error 2 Refer to chapter 8 of the MR-J3- B Servo Amplifier Instruction Manual.
21 Encoder error 3
24 Main circuit
error
25 Absolute
position erase
27 Initial magnetic
pole detection
error
2B Encoder
counter error
Definition
Wrong combination of Wrong combination of servo amplifier
servo amplifier and and encoder.
encoder.
Absolute position data 1. Voltage drop in encoder
in error (Battery disconnected.)
2. Battery voltage low
3. Battery cable or battery is faulty.
4. Absolute position storage unit faulty. Replace the absolute position storage unit.
5. The encoder cable is disconnected
or broken.
Power was switched Home position not set.
on for the first time in
the absolute position
detection system.
Initial magnetic pole 1. Machine struck.
detection did not
operate normally
2. Accuracy at initial magnetic pole
detection is low.
3. Poor wiring of U, V and W.
4. Magnetic pole detection limit switch
is not on.
Data created by the 1. Noise entered the encoder.
encoder has errors.
2. Encoder fault.
3. Encoder cable faulty.
Cause
Use correct combination.
Connect the battery.
According to the startup procedure (Refer to
section 4.1.1), start up the direct drive servo
again, and set the home position.
Replace the battery.
According to the startup procedure (Refer to
section 4.1.1), start up the direct drive servo
again, and set the home position.
According to the startup procedure (Refer to
section 4.1.1), start up the direct drive servo
again, and set the home position.
Check the encoder cable.
According to the startup procedure (Refer to
section 4.1.1), start up the direct drive servo
again, and set the home position.
Connect the battery.
According to the startup procedure (Refer to
section 4.1.1), start up the direct drive servo
again, and set the home position.
Perform the magnetic pole detection in
order not to strike the machine.
Check the parameter No.PS09 setting
(magnetic pole detection voltage level).
Correct the wiring.
Connect the magnetic detection limit switch
correctly.
When not connecting the limit switch to the
servo amplifier, check the setting of
parameter No.PS08 (special function
selection 3).
Shut off the power supply once, then turn
on the power supply again.
According to the startup procedure (Refer to
section 4.1.1), start up the direct drive servo
again, and set the home position.
Replace the direct drive motor.
Check if the shield of the encoder cable is
treated correctly. (Refer to section 9.1.2(3))
After confirming its treatment, start the
direct drive servo again by referring to the
startup procedure (in section 4.1.1) and set
the home position.
6 - 3
Action