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7 Troubleshooting
MITSUBISHI CNC
Alarm No.
16
Initial magnetic pole position detection error
In linear motor or IPM spindle motor using absolute position encoder, the servo ON has been set before the magnetic pole shift
amount(servo:SV028,spindle:SP118) is set. In the initial magnetic pole position detection control, the pole position was not
correctly set.
Investigation details Investigation results Remedies SV SP
1
Check the parameters, SV028 (for the servo) and
SP118(for the spindle).
The parameters have not been set. Set the magnetic shift pole amount(SP118).
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The parameters have been set, but the alarm
occurs.
Carry out the magnetic pole estimation again,
as the setting value is wrong.
The setting parameter value is the same
even when initial magnetic pole function was
executed again.
Check the investigation item No. 2.
2 Check the repeatability.
The error is always repeated. Replace the drive unit.
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The state returns to normal once, but occurs
sometimes thereafter.
Check the investigation item No. 3.
3
Check if there is any abnormality in the unit's
ambient environment.
(Ex. Ambient temperature, noise, grounding)
Take remedies according to the causes of the abnormality in the ambient environment.
[1] Machine grounding check
[2] Shield connection of the cable
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Alarm No.
17
A/D converter error
An error was detected in the current FB.
Investigation details Investigation results Remedies SV SP
1 Check the repeatability.
The error is always repeated. Replace the drive unit.
◯◯
The state returns to normal, but occurs
thereafter.
Check the investigation item No. 2.
2
Check if there is any abnormality in the unit's
ambient environment.
(Ex. Ambient temperature, noise, grounding)
Take remedies according to the causes of the abnormality in the ambient environment.
◯◯
Alarm No.
18
Main side encoder: Initial communication error
An error was detected in the initial communication with the motor side encoder.
Investigation details Investigation results Remedies SV SP
1
Check the servo parameter (SV025.ent) setting
value.
Check the spindle parameter(SP020) setting value.
The value is not set correctly.
Correctly set SV025 for the servo, and
SP020 for the spindle.
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The value is set correctly. Check the investigation item No. 3.
2
Check the encoder.
Check if a pulse encoder is used for serial encoder
specifications.
The pulse encoder is used. Replace the encoder to the serial.
◯◯
The serial encoder is used. Check the investigation item No. 3.
3
Jiggle the encoder connectors (drive unit side and
encoder side) and check if they are disconnected.
The connector is disconnected (or loose). Correctly install.
◯◯
The connector is not disconnected. Check the investigation item No. 4.
4
Turn the power OFF, and check the encoder cable
connection with a tester.
The connection is faulty. Replace the encoder cable.
◯◯
The connection is normal. Check the investigation item No. 5.
5
Replace with another unit, and check whether the
fault is on the unit side or encoder side.
The alarm is on the drive unit side. Replace the drive unit.
◯◯
The alarm is on the encoder side. Check the investigation item No. 6.
6
Check if there is any abnormality in the encoder's
ambient environment.
(Ex. Ambient temperature, noise, grounding)
Take remedies according to the causes of the abnormality in the ambient environment.
[1] Machine grounding check
[2] Shield connection of the cable
◯◯
Alarm No.
19
Encoder communication error in synchronous control:
An error was detected in the machine side encoder of the secondary axis at the speed command synchronization control.
Investigation details Investigation results Remedies SV SP
1
Check the servo parameter value of secondary axis
(SV025.pen:position encoder).
The value is not set correctly. Correctly set.
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The value is set correctly. Check the investigation item No. 2.
2
Check if there are no problems in the connection
between the encoder (linear scale) and MDS-B-HR.
The screw connected to MDS-B-HR is
winded down.
Tighten up the screw.
◯
No problems found in the connector
connection.
Check the investigation item No. 3.
3
Jiggle the encoder connectors (drive unit side and
encoder side) and check if they are disconnected.
The connector is disconnected (or loose). Correctly install.
◯
The connector is not disconnected. Check the investigation item No. 3.
4
Turn the power OFF, and check the encoder cable
connection with a tester.
The connection is faulty. Replace the encoder cable.
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The connection is normal. Check the investigation item No. 4.
5
Replace with another unit, and check whether the
fault is on the unit side or encoder side.
The alarm is on the drive unit side. Replace the drive unit.
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The alarm is on the encoder side. Check the investigation item No. 5.
6
Check if there is any abnormality in the encoder's
ambient environment.
(Ex. Ambient temperature, noise, grounding)
Take remedies according to the causes of the abnormality in the ambient environment.
[1] Machine grounding check
[2] Shield connection of the cable
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