Mitsubishi Electric C70 Setup Manual page 586

Alarm No.
Regeneration circuit error:
3C
An error was detected in the regenerative transistor or in the regenerative resistor.
Investigation details
Check if an external regenerative resistor is
1
used.
Is the short wire connected between P and
D terminal?
2
Are there any problems with the connection
condition? (looseness of the screw)
Is the connection of the regenerative
3 resistor or regeneration resistor cable
correct?
Is the regeneration resistor or the
regeneration resistor cable broken?
4 Disconnect the regenerative resistor
terminal and check the resistance value with
a tester.
Alarm No.
Power supply voltage error at acceleration/deceleration:
3D
A motor control error was detected at acceleration/deceleration due to an input voltage drop.
Investigation details
Measure the input voltage during operations
1
with a tester.
2 Check the load inertia.
Magnetic pole position detection error:
Alarm No.
The magnetic pole position is not reliable in the magnetic pole position detection control.
3E
This alarm occurs at the detection level which is set in SV094.
Investigation details
Adjust the setting value of the servo
1 parameter SV094 and detect the magnetic
pole position.
Feedback error 3
Alarm No.
Either a missed feedback pulse in the main side incremental detector or an error in the Z-phase was detected in the full
41
closed loop system. In the servo, Z-phase was not detected by a rotary detector within 2 rotations.
Investigation details
Check the connection condition of the cable
1 and detector.
- Check if the cable is disconnected.
Feedback error 1
Alarm No.
An error was detected in the sub side detector (feedback signals of the position detector in a servo system, or PLG's
42
feedback signals in a spindle system).
Investigation details
1 Check SP019 and SP020.
2 Check the alarm No. "2C" items.
Investigation results
An external regenerative resistor is used.
A built-in regenerative resistor is used.
The wire is not connected.
The connector is disconnected.
The connector has a contact fault.
The connection is correct.
The wire is not connected.
The connection is correct.
The regeneration resistor is broken.
Or the resistance value is different from the
specified value.
The regeneration resistor cable is broken.
The resistance value is normal.
Investigation results
During operations, the voltage fluctuates
widely.
During operations, the voltage is stable.
The load inertia (workpiece etc.) is
excessive.
The load inertia is normal.
Investigation results
Set SV094.
SV094 is set.
Investigation results
The cable is disconnected.
The cable is normal.
The alarm occurs even after it is
reconnected.
Investigation results
Parameter is set incorrectly.
Parameter is set correctly.
Appendix 2.16 Troubleshooting
Remedies
Check the investigation item No. 3.
Check the investigation item No. 2.
Connect the wire.
Reconnect the connector.
Replace the connector.
Replace the drive unit.
Connect the wire.
Check the investigation item No. 4.
Replace the regenerative resistor.
Replace the cable.
Replace the drive unit.
Remedies
Increase the power capacity (KVA).
Check the investigation item No. 2.
[1] Lower the load inertia.
[2] Extend the rapid traverse time constant
for G0/G1.
Replace the drive unit.
Remedies
Set SV094.
The standard value for a rotary motor is 100.
The standard value for a linear motor is 10.
Set the optimal value allowing for the
coasting distance (Increase the value).
Remedies
Replace the cable.
Check for dirt on the connector terminal and
reconnect it.
Replace the detector.
Remedies
Correctly set.
Check the investigation item No. 2.
C70 Setup Manual
SV SP
SV SP
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SV SP
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SV SP
SV SP
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