Mitsubishi Electric MDS-E Series Instruction Manual page 422

MDS-E/EH Series Instruction Manual
7 Troubleshooting
Sub side encoder: Communication error
Alarm No.
An error was detected in communication data with the linear scale or the ball screw side encoder. Or the communication was
1F
interrupted.
Investigation details
Jiggle the encoder connectors (drive unit side and
1
encoder side) and check if they are disconnected.
Is the encoder cable wired in the same conduit as
2 the motor's power cable, or are the two cables laid
in parallel near each other?
Is the motor FG wire connected only to the drive unit
3 which drives it?
(Is the motor grounded to one point?)
Turn the power OFF, and check the encoder cable
4
connection with a tester. (Is the cable shielded?)
Replace with another unit, and check whether the
5
fault is on the unit side or encoder side.
Check if there is any abnormality in the encoder's
6 ambient environment.
(Ex. Ambient temperature, noise, grounding)
Sub side encoder: No signal2
Alarm No.
When an excessive error alarm occurred, no signal from the machine side encoder was detected.
21
An error was detected in the ABZ-phase in the full closed loop control system.
Investigation details
Check the servo parameter (SV025. pen: machine
side encoder), and spindle parameter (SP019)
1 setting value.
Are the pulse type encoder parameters set for a
serial communication type encoder?
Jiggle the encoder connectors (drive unit side and
2
encoder side) and check if they are disconnected.
Turn the power OFF, and check the encoder cable
3
connection with a tester.
Replace with another unit, and check whether the
4
fault is on the unit side or encoder side.
Check if there is any abnormality in the encoder's
5 ambient environment.
(Ex. Ambient temperature, noise, grounding)
Alarm No.
Encoder data error:
22
Drive unit received a wrong feedback data (scattered data) from the encoder and position deviation occurred.
Investigation details
1 Check if the installation of the encoder is loosened.
Check if an excessive vibration is occurring during
2
machining.
Check if there is any liquid ingress inside the
3
encoder connector.
4 Check the investigation item No.2 or subsequent items in Alarm No.21.
Investigation results
The connector is disconnected (or loose).
The connector is not disconnected.
The cables are wired near each other. (Noise
is entering from the power cable.)
The wires are sufficiently separated.
The motor FG wire is grounded on the motor
side.
The motor is grounded to one point.
The connection is faulty.
The connection is normal.
The alarm is on the drive unit side.
The alarm is on the encoder side.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
The value is not set correctly.
The value is set correctly.
The connector is disconnected (or loose).
The connector is not disconnected.
The connection is faulty.
The connection is normal.
The alarm is on the drive unit side.
The alarm is on the encoder side.
Take remedies according to the causes of the abnormality in the ambient environment.
Investigation results
It is loosened.
It is not loosened.
An excessive vibration is occurring.
An excessive vibration is not occurring.
Liquid was entered into the connector.
No liquid ingress.
391
Remedies
Correctly install.
Check the investigation item No. 2.
Wire the encoder cable away from the power
cable.
Shield the power cable.
Check the investigation item No. 3.
Ground the motor to one point, connecting
the wires together on the drive unit side.
Check the investigation item No. 4.
Replace the encoder cable.
Check the investigation item No. 5.
Replace the drive unit.
Check the investigation item No. 6.
Remedies
Correctly set SV025.pen for the servo and
SP019 for the spindle (including SP097 for
pulse type).
Check the investigation item No. 3.
Correctly install.
Check the investigation item No. 4.
Replace the encoder cable.
Check the investigation item No. 5.
Replace the drive unit.
Replace the encoder.
Remedies
Tightly install the encoder.
Check the investigation item No. 2.
Check the installation of the machine.
Check the investigation item No. 3.
Replace the motor encoder.
Check the investigation item No. 4.
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IB-1501229-F