Mitsubishi Electric MELSEC iQ-R RD75P4, User Manual

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14 TROUBLESHOOTING
14.2 Troubleshooting by Symptom
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A motor does not rotate at the set speed
■
The object did not reach the set position
Check item Action
The value in [Md.28] Axis feedrate is same with or different from the set
speed. [When the value in [Md.28] Axis feedrate is same with the set speed]
• The electronic gear of 16 bits is used: Check that settings of [Pr.2] No. of
pulses per rotation (16 bits), [Pr.3] Movement amount per rotation (16 bits),
and [Pr.4] Unit magnification meet the system.
• The electronic gear of 32 bits is used: Check that settings of [Pr.2] No. of
pulses per rotation (32 bits) and [Pr.3] Movement amount per rotation (32
bits) meet the system.
• When the drive unit has the electronic gear function, check that the settings
meet the system.
[When the value in [Md.28] Axis feedrate is different from the set speed]
• Check that the speed is not limited by the value in [Pr.8] Speed limit value.
• In JOG operation, check that the speed is not limited by the value in [Pr.31]
JOG speed limit value.
• In JOG operation, check that Forward run JOG start signal [Y8, YA, YC, YE]
or Reverse run JOG start signal [Y9, YB, YD, YF] do not repeatedly turn on
and off.
Check item Action
The value in [Md.20] Current feed value is same with or different from the set
position. [When the value in [Md.20] Current feed value has reached the set position]
• The electronic gear of 16 bits is used: Check that settings of [Pr.2] No. of
pulses per rotation (16 bits), [Pr.3] Movement amount per rotation (16 bits),
and [Pr.4] Unit magnification meet the system.
• The electronic gear of 32 bits is used: Check that settings of [Pr.2] No. of
pulses per rotation (32 bits) and [Pr.3] Movement amount per rotation (32
bits) meet the system.
• When the drive unit has the electronic gear function, check that the settings
meet the system.
[When the value in [Md.20] Current feed value has not reached the set
position]
• If the motor is stopped by Axis stop signal [Y4, Y5, Y6, Y7] or by Stop signal
(STOP), 1: Stopped is stored in [Md.26] Axis operation status.
• If the motor is stopped with an axis error, -1: Error is stored in [Md.26] Axis
operation status. Check the error code and take the action described in the
following.
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Page 527 List of Error Codes