NSK EDD Megatorque Motor - Troubleshooting Specific Failures

12. Troubleshooting
— 12-2 —
12.2.1. Power Trouble
Table 12-3: Troubleshooting for power problem
Cause
Remedy
1)
No control power supplied.
 Check the control power voltage at the connector of the Driver Unit.
2)
CPU is not functioning.
• The power is on but the CPU is not
functioning.
 Refer to “CPU Error” in “11.3. Causes and Remedy.”
3)
Defective Driver Unit.
 If no failure is found in the above checks, the Driver Unit may be
defective. Replace it referring to “Appendix 5: Procedure for Replacing
Driver Unit Model EDD.”
12.2.2. Motor Trouble
Table 12-4: Troubleshooting for Motor trouble
Cause
Remedy
1)
Wrong combination of Motor and Driver
Unit.
 Check if the combination of the Motor and the Driver Unit is correct.
2)
Alarm or warning is occurring.
 Identify a warning or an alarm.
3)
Overload or mechanical interference with
other part.
 The Motor is locked by a part of surrounding mechanism.
 Check for mechanical interference with other part of mechanism.
4)
Positioning is not completed.
• (As the sequence of the total System) The
System recognizes that the previous
positioning command is not executed.
• (In case of a program operation)
executing sequence does not complete the
previous positioning command.)
4-1) Overload or interference with the
equipment into which the Motor is
installed.
• The Motor is not locked, but an excessive
friction load is applied to the Motor due to
the mechanical interference with the
surrounding mechanism.
4-2) Poor tuning of servo gains
4-3) In the middle of processing a
positioning command.
• Executing a positioning command
• Executing a program operation caused by
the parameter OE2.
 Confirm if the output BUSY is closed or monitor the state of Input and
output by the monitor IO0/RP.
 If the BUSY signal is closed, the System is executing a positioning
command.
 4-1): Check the mechanical interference with the surrounding mechanism.
 4-2): Refer to “5. Tuning” for adequate tuning.
 4-3):
• Wait for completion of the positioning command.
• Terminate the positioning command (such as the command JOG).
• Input the STP (Stop) command to interrupt the positioning operation.
5)
No torque output because the parameter
TL is set to zero (TL0).
 Check if the parameter TL100 is specified by the ?TL command.
If not, the setting may be altered for some reason. (Normally it should be
TL100.)
 Enter TL100 for 100% output torque. (Requires an entry of the password.
6)
Motor servo is deactivated by the
command MO (Servo off).
 Enter the command SV to activate the Motor servo.
7)
The objective program channel is not
selected in a program operation.
 Use the command IO0 to confirm if the objective channel is selected.
8)
Defective Cable, Motor and/or Driver
Unit.
 Refer to “Appendix 2: How to Check Motor Condition.” Replace the cable
of the Motor if necessary.
 If no failure is found in the Cable and the Motor, the Driver Unit may be
defective. Replace it referring to “Appendix 5: Procedure for Replacing
Driver Unit Model EDD.”