Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-R-RD75P4 User Manual

14.2

Troubleshooting by Symptom

A motor does not rotate
The check items and actions are listed below.
Check item
PLC READY signal is off.
The drive unit is not powered on.
An error may have occurred on the drive unit.
The RD75 is not wired to the drive unit correctly.
The drive unit is not wired to the motor correctly.
The limit signals are not wired correctly.
An error may have occurred on the RD75. (The ERR LED is on or flashing.)
1: Stopped is stored in [Md.26] Axis operation status.
The value in [Md.20] Current feed value did not change even after the
execution of positioning.
The number of input pulses in the monitor of the drive unit did not change
even after the execution of positioning.
The pulse output mode setting does not meet the specifications of the drive
unit.
The output logic setting of the command pulse signal does not meet the
specifications of the drive unit.
*1 Check this item only when the drive unit has a monitor function of the number of input pulses.
If a motor does not rotate even after the above items are checked, the possible cause is a module failure. Please consult your
local Mitsubishi representative.
A motor does not rotate as intended
The check items and actions are listed below.
■A motor rotates only in one direction
Check item
The wiring is not correct.
The pulse output mode setting does not meet the specifications of the drive
unit.
■A motor rotates in the reverse direction
Check item
The wiring is not correct.
The setting of [Pr.6] Rotation direction setting and the logic of the command
pulse signal ([Pr.23] Output signal logic selection, b0) do not match the setting
of the drive unit.
*1
Action
Review the program so that PLC READY signal [Y0] turns on.
Power on the drive unit.
Check the error code of the drive unit and take the action.
Check and correct the wiring between the RD75 and the drive unit.
Check and correct the wiring between the drive unit and the motor.
Check the wiring and logic setting of the limit signals and correct them.
Check the error code and take the action.
• Review the stop program.
• Check that Stop signal (STOP) is not accidentally input.
Review the start program.
Refer to the manual for the drive unit used and check that the function to
suppress the motor rotation is not working.
Set a value in [Pr.5] Pulse output mode so that the setting meets the
specifications of the drive unit.
Set the logic of the command pulse signal ([Pr.23] Output signal logic
selection, b0) so that the setting meets the specifications of the drive unit.
Action
Check that the signal line of the pulse output (for axis 1, connector pin
No.1A15 to No.1A18) is correctly wired and not disconnected.
Set a value in [Pr.5] Pulse output mode so that the setting meets the
specifications of the drive unit.
Action
Check that the signal line of the pulse output (for axis 1, connector pin No.
1A15 to 1A18) is correctly wired (CW and CCW or A phase and B phase is not
reversely wired).
Set the value in [Pr.6] Rotation direction setting and set the logic of the
command pulse signal ([Pr.23] Output signal logic selection, b0) so that they
meet the setting of the drive unit.
14.2 Troubleshooting by Symptom
14 TROUBLESHOOTING
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