Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual, Page: 382 / 500

14. USING A DIRECT DRIVE MOTOR
14 - 49
Alarm No.: 27 Name: Initial magnetic pole detection error Stop system: Each axis
Alarm content The initial magnetic pole detection was not completed properly.
Display Detail name Cause Check method Check result Action
27.4 Magnetic pole
detection
estimated error
1) The estimated value of
magnetic pole detection is
not correct.
Check it with the check method for alarm display "27.1".
27.5 Magnetic pole
detection
position
deviation error
1) Position deviation
increased during the
magnetic pole detection.
Check it with the check method for alarm display "27.1".
27.6 Magnetic pole
detection speed
deviation error
1) Speed deviation increased
during the magnetic pole
detection.
Check it with the check method for alarm display "27.1".
27.7 Magnetic pole
detection
current error
1) The current reached the
alarm level during the
magnetic pole detection.
Check it with the check method for alarm display "27.1".
Alarm No.: 28 Name: Encoder counter error Stop system: Each axis
Alarm content
Data which encoder created is failure.
When the alarm occurs, startup the direct drive servo again, and then make home position setting.
Display Detail name Cause Check method Check result Action
The shielded part is
broken. Repair the cable. 1) Encoder cable is faulty. Check the condition of
the shielded part.
The shielded part
has no problem. Check 2).
Problem found. Take countermeasures
against its cause. 2) Something near the device
caused it.
Check the noise,
ambient temperature,
etc.
No problem found. Check 3).
2B.1 Encoder
counter error 1
3) Encoder failure Replace the direct drive
motor, and then check
the repeatability. It is not repeatable. Replace the direct drive
motor.
2B.2 1) Encoder cable is faulty. Encoder
counter error 2
2) Something near the device
caused it.
3) Encoder failure
Check it with the check method for alarm display "2B.1".
Alarm No.: 30 Name: Regenerative error Stop system: All axes
Alarm content
Permissible regenerative power of the built-in regenerative resistor or regenerative option is exceeded.
A regenerative transistor in the servo amplifier is malfunctioning.
Display Detail name Cause Check method Check result Action
30.1 Regeneration
heat error
30.2 Regenerative
transistor error
30.3 Regenerative
transistor
feedback data
error
Same as for the rotary servo motors.
Refer to section 8.3.