Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

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14. USING A DIRECT DRIVE MOTOR
14 - 48
Alarm No.: 25 Name: Absolute position erased Stop system: Each axis
Alarm content
An error was found in the absolute position data.
Power was switched on for the first time in the absolute position detection system.
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
25.1 Absolute
position data
erase
Performed. Check that the battery is
mounted, and make home
position return. 1) Power was switched on for
the first time in the absolute
position detection system.
Check if the action
stated in the left is
performed.
Not performed. Check 2).
Performed. Check that the battery is
mounted, and make home
position return. 2) The battery was removed
(replaced) when the control
circuit power supply was
off.
Check if the action
stated in the left is
performed.
Not performed. Check 3).
Below 3.0VDC. Replace the battery. 3) The battery voltage is low.
(Battery is consumed.)
Check the battery
voltage with a tester.
3.0VDC or more. Check 4).
Problem found. Replace the battery cable. 4) The battery cable is faulty. Check for poor contact
using a tester.
No problem found. Check 5).
Problem found. Repair or replace the
encoder cable. 5) Encoder cable is faulty. Check for poor contact
using a tester.
Check the voltage on
the motor side.
No problem found. Check 6).
It does not occur. Replace the absolute
position storage unit. 6) The absolute position
storage unit is
malfunctioning.
Check if it occurs with a
new absolute position
storage unit.
It occurs. Check 7).
7) Encoder failure Check if it occurs with a
new battery. It occurs. Replace the servo motor.
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
It collided. Move the start position of
the magnetic pole
detection. 1) A moving part collided
against the machine.
Check if it collided.
It did not collided. Check 2).
Problem found. Correct the wiring. 2) Power line wiring failure The servo motor power
lines are not routed
correctly.
No problem found. Check 3).
27.1 Magnetic pole
detection
abnormal
termination
3) Accuracy of the initial
magnetic pole detection is
not satisfactory.
The travel distance at
the magnetic pole
detection is short. It is too short. Review the parameter
No.PS09 setting.
Problem found. Remove the cause.
Change the location of the
magnetic pole detection. 1) Only one of the magnetic
pole detection limit
switches is on.
Check the limit
switches.
No problem found. Check 2).
27.2 Magnetic pole
detection time
out error
2) The magnetic pole
detection voltage level is
small.
The travel distance at
the magnetic pole
detection is short. It is too short. Review the parameter
No.PS09 setting.
27.3 Magnetic pole
detection limit
switch error
1) Both of the magnetic pole
detection limit switches are
off.
Check if the limit
switches are off. They are off. Turn on the limit switches.