Pulse Catch Function; Positioning Function - Mitsubishi MELSEC L Series User Manual

15.3.8

Pulse catch function

If pulses are not detected, check the following items.
The pulse catch function is not set to the input signal.
A voltage greater than or equal to the input on voltage is not
applied between the input terminal and the COM terminal.
The input response time is improperly set.
Detectable pulses are not input.
If pulses are not detected even after taking the above actions, the possible cause is a hardware failure.
Please consult your local Mitsubishi service center or representative, explaining a detailed description of the problem.
15.3.9

Positioning function

The check items and actions in this section are described in the case of axis 1.
For special relay and special register for other channels, refer to the following.
• Special relay:
• Special register:
If a motor does not rotate, check the following items.
The positioning function is not set to the output signal.
Axis 1 axis operation status (SD1844) indicates "stopped"
(1).
Axis 1 current feed value (SD1840, SD1841) does not
change after positioning control is performed.
The pulse output mode setting does not meet the
specifications of the drive unit.
The logic of pulse output does not match with the one set for
the drive unit.
If the motor does not rotate even after taking the above actions, the possible cause is a hardware failure.
Please consult your local Mitsubishi service center or representative, explaining a detailed description of the problem.
110
Check item
Page 245, Appendix 2
Page 291, Appendix 3
Check item
Action
Correct the parameter.
Check wiring with external devices and correct it.
Set the input response time shorter than the pulse width.
If the pulse width is shorter than the minimum input response
time, the pulse signals are not detected.
Set the pulse width longer or use the high-speed counter
function.
Action
Correct the parameter.
Review the program stopped.
Review the start program.
Set the pulse output mode so that it can meet the
specifications of the drive unit.
Set the drive unit to negative logic.