Mitsubishi Electric MELSEC-L LD75D, User Manual

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(3) Troubleshooting when a motor does not rotate as intended.
Check items and corrective actions for troubleshooting when a motor does not rotate as intended are described
below.
(a) When a motor rotates only in one direction
(b) When a motor rotates in the opposite direction
(c) When a motor does not rotate at the set speed
(d) When the set position is not reached
Check item Action
Is the wiring correct?
Check that the signal line of the pulse output (for axis 1, connector pin No. "1A15 to 18") is correctly
wired or not disconnected.
Does the setting of the pulse output mode meet the
specifications of the drive unit?
Set "[Pr.5] Pulse output mode" so that it satisfies the specifications of the drive unit.
Check item Action
Is the wiring correct?
Check that the signal line of the pulse output (for axis 1, connector pin No. "1A15 to 18") is wired
correctly. (CW and CCW or phase A and phase B should be correctly wired.)
Do the values in "[Pr.6] Rotation direction setting" and
"[Pr.23] Output signal logic selection (b0: Command
pulse signal) " match the settings of the drive unit?
Check that the values in "[Pr.6] Rotation direction setting" and "[Pr.23] Output signal logic selection
(b0: Command pulse signal)" match the settings of the drive unit.
Check item Action
Does the value in "[Md.28] Axis feedrate" indicate the
set speed?
When "[Md.28] Axis feedrate" indicates the set speed
• Check that the values in "[Pr.2] No. of pulses per rotation", "[Pr.3] Movement amount per rotation",
and "[Pr.4] Unit magnification" meet the system.
• When the drive unit has the electronic gear function, check that the settings meet the system.
When "[Md.28] Axis feedrate" does not indicate the set speed
• Check that the speed is not limited by the value in "[Pr.8] Speed limit value".
• In the JOG operation, Check that the speed is not limited by the value in "[Pr.31] JOG speed limit
value".
• In the JOG operation, check that Forward/Reverse run JOG start signals (Y8 to YF) do not
repeatedly turn ON and OFF.
Check item Action
Does the value in "[Md.20] Current feed value"
indicate the intended position when the motor stops?
When "[Md.20] Current feed value" reaches the set position
• Check that the values in "[Pr.2] No. of pulses per rotation", "[Pr.3] Movement amount per rotation",
and "[Pr.4] Unit magnification" meet the system.
• When the drive unit has the electronic gear function, check that the settings meet the system.
When "[Md.20] Current feed value" does not reach the set position
• Check that the motor is not stopped by Axis stop signals (Y4 to Y7) or a stop signal (STOP). If a
motor is stopped by them, the value "1: Stopped" is stored in "[Md.26] Axis operation status".