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Mitsubishi Electric MR-J5-G Series User Manual page 45

Ac servo system
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[AL. 025.1_Servo motor encoder - Absolute position erased]
Cause
1.
Power was switched on for the first time in the
absolute position detection system.
2.
The Mitsubishi Electric servo motor equipped
with a batteryless absolute position encoder
that was connected to the absolute position
detection system at startup was changed to
another servo motor.
3.
After the control circuit power supply was shut
off, the battery was removed in either of the
following situations:
• When using an MR-BAT6V1SET(-A) battery or MR-BT6VCASE
battery case, CN4 of the servo amplifier was disconnected with
the control circuit power supply off.
4.
The power was shut off in either of the
following situations:
• When using an MR-BAT6V1SET(-A) or MR-BT6VCASE, the
power was shut off with the battery disconnected from CN4.
5.
The battery voltage is too low. The battery is
exhausted.
6.
The voltage dropped considerably in the
encoder cable wired to the battery.
7.
There is a problem with the battery cable.
8.
There is a loose connection of the encoder
cable on the servo motor side.
9.
When using a direct drive motor, the absolute
position storage unit is not connected.
10.
There is a problem with the encoder cable.
11.
When the Mitsubishi Electric servo motor
equipped with a batteryless absolute position
encoder was used, an external force rotated
the servo motor shaft at a high speed at power
failure.
12.
There is a problem with the surrounding
environment when using the Mitsubishi
Electric servo motor equipped with a
batteryless absolute position encoder.
13.
The servo amplifier has malfunctioned.
14.
The encoder has malfunctioned.
Check/action method
If the power was switched on for the first time after the absolute position
detection system is set, check that the battery is mounted correctly before
homing.
When using a Mitsubishi Electric servo motor equipped with a batteryless
absolute position encoder, allow the alarm to occur for 5 s, then cycle the
power. Perform homing.
Connect the servo motor that was connected at the startup of the absolute
position detection system. Start up the absolute position detection system
again.
If the battery was disconnected as described in the left column, check that the
battery is mounted correctly before homing.
If the power supply was shut off as described in the left column, check that the
battery is mounted correctly before homing.
When MR-BAT6V1SET(-A) or MR-BT6VCASE is used, see 5.
Check the battery voltage with a tester. If the voltage is lower than 3 V DC,
replace the battery, then execute homing.
Check if the recommended wires are being used for the encoder cable.
If the recommended wires are not being used, use the recommended wires,
then execute homing.
Refer to "Wires for option cables" in the following manual.
Rotary Servo Motor User's Manual (HK series)
Check for a loose connection with a tester.
If there is a loose connection, use a recommended cable, then execute
homing.
Check for a loose connection with a tester. Measure the voltage on the servo
motor side.
If there is a loose connection, repair or replace the encoder cable, then
execute homing.
If the absolute position storage unit has not been connected correctly, connect
it correctly, then execute homing.
Refer to "Combinations of encoder cables" in the following manual.
Direct Drive Motor User's Manual
If there is a problem with the encoder cable, replace or repair the cable, then
execute homing.
Make sure that the servo motor shaft will not be rotated by an external force at
a high speed. After removing the cause, execute homing, then turn the servo
motor shaft at least 180 degrees.
Check the noise, ambient temperature, and other conditions, and implement
appropriate countermeasures for the cause. If there is noise, take
countermeasures to reduce the noise.
Refer to "Noise reduction techniques" in the following manual.
MR-J5 User's Manual (Hardware)
After removing the cause, execute homing, then turn the servo motor shaft at
least 180 degrees.
Replace the servo amplifier.
Replace the servo motor.
1 SERVO AMPLIFIER TROUBLESHOOTING
1.3 Handling methods for alarms/warnings
1
Model
[A]
[G]
[WG]
43
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