Mitsubishi Electric MR-J5-G Series User Manual page 46

[AL. 025.2_Scale measurement encoder - Absolute position erased]
Cause
1.
Power was switched on for the first time after
the scale measurement encoder was set for
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 or encoder.
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) battery 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 scale measurement encoder-
side.
9.
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.
10.
There is a problem with the surrounding
environment when using the Mitsubishi
Electric servo motor equipped with a
batteryless absolute position encoder.
11.
The servo amplifier has malfunctioned.
12.
The scale measurement encoder has
malfunctioned.
1 SERVO AMPLIFIER TROUBLESHOOTING
44
1.3 Handling methods for alarms/warnings
Check/action method
If the power was switched on for the first time, 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.
Check the battery voltage with a tester. If the voltage is lower than 3 V DC,
replace the battery.
Check if the recommended wires are being used for the encoder cable.
Refer to "Wires for option cables" in the following manual.
Rotary Servo Motor User's Manual (HK series)
Refer to "WIRING OPTION" in the following manual.
Direct Drive Motor User's Manual
Refer to "OPTION CABLE/CONNECTOR SETS" in the following manual.
MR-J5 Partner's Encoder User's Manual
Check for a loose connection with a tester.
If there is a loose connection, use a recommended cable.
Check for a loose connection with a tester. Measure the voltage on the scale
measurement encoder-side.
If there is a loose connection, repair or replace the encoder cable.
Make sure that the servo motor will not be rotated by an external force at a
high speed.
After removing the cause and clearing the alarm, perform 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 and clearing the alarm, perform homing, then turn
the servo motor shaft at least 180 degrees.
Replace the servo amplifier.
Replace the scale measurement encoder.
Model
[G]
[WG]