Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

Page: 315 / 500

13. USING A LINEAR SERVO MOTOR
13 - 66
Alarm No.21 Name: Encoder normal communication error 2 Stop method: Corresponding axis stops
Alarm description Error is found in the linear encoder data.
Display Name Cause Checkpoint Finding Action
21.1 Encoder data
error
(1) Linear encoder is faulty. Error is not
reproduced. Replace the linear
encoder. Replace the linear
encoder and check the
reproducibility of the error. Reproduced. Check
(2).
(2) Fault is generated from
the surrounding
environment.
Check for noise and other
factors. Problem found. Take countermeasure
according to the
cause.
Alarm No.24 Name: Main circuit error Stop method: All axes stop
Alarm description
Ground fault occurs at servo motor power cable of the servo amplifier.
Ground fault occurs at servo motor.
Display Name Cause Checkpoint Finding Action
24.1 Ground fault
detected at
hardware
detection circuit
Same as for the rotary servo motor.
Refer to section 8.3.
24.2 Ground fault
detected at
software
detection function
Alarm No.27 Name: Initial magnetic pole detection error Stop method: Corresponding axis stops
Alarm description Initial magnetic pole detection cannot be performed properly.
Display Name Cause Checkpoint Finding Action
27.1 (1) Machine struck
something.
Check if the machine
struck something. Machine struck
something. Move the start position
of the magnetic pole
detection. magnetic pole
detection
abnormal
termination
Machine did not strike. Check (2).
(2) Problem found. Modify the wiring. Wiring fault of the power
cable. Check the power cable.
Normal. Check (3).
(3) Setting is incorrect. Correct the setting. Resolution of the linear
encoder and the
resolution setting of the
parameter are different. Review the parameter
No.PS02 and PS03
settings.
Setting is correct. Check (4).
(4) The polarity is
incorrect. Correct the setting. Polarity of the linear
encoder is incorrect.
(Installation direction is
incorrect.) Check polarities of the
linear encoder and the
linear servo motor.
Normal. Check (5).
(5) Accuracy of the initial
magnetic pole detection
is not satisfactory.
Travel distance during the
magnetic pole detection
is short. Travel distance is
short. Review the parameter
No.PS09 setting.
27.2 magnetic pole
detection time out
error
(1) Only one of the magnetic
pole detection limit
switches is ON.
Check the status of the
limit switch. Problem found. Remove the cause.
Change the location of
the magnetic pole
detection.
Normal. Check (2).
(2) Excitation level during the
initial magnetic pole
detection is small.
Travel distance during the
magnetic pole detection
is short. Travel distance is
short. Review the parameter
No.PS09 setting.