If The Servo Motor Or The Stepping Motor Does Not Operate - Mitsubishi MELSEC-F FX3U Series User Manual

FX /FX Series PLC User's Manual - Positioning Control Edition
3U 3UC
Built-in Positioning Function
13.3

If the Servo Motor or the Stepping Motor Does Not Operate

If the servo motor or the stepping motor does not operate, check the following items.
1) Check the wiring condition.
→ To connect the MELSERVO Series, refer to the examples of connection shown in the Appendix.
2) Execute the positioning instruction, and then check the statuses of the following LED indicator lamps.
- LED indicator lamp of the output specified as the pulse output destination
- LED indicator lamp of the output specified as the rotation direction output device
3) Check that the same pulse output method is adopted for both the PLC and the servo amplifier (drive unit).
→ For details on high-speed output special adapter setting method,refer to Subsection 4.5.2.
4) Check that the pulse output stop command flag is off.
The following table shows the pulse output stop command flag of each pulse output destination device
(Y000, Y001, Y002, Y003).
Pulse output destination
device
Y000
Y001
Y002
Y003
5) Check that the limit switch (forward or reverse rotation limit switch) is not activated.
The following table shows the forward and reverse limit flags of each pulse output destination device
(Y000, Y001, Y002, Y003).
Pulse output
destination
device
Y000
Y001
Y002
Y003
6) Check the operation timing of the positioning instruction.
If "pulse output monitor" (BUSY/READY) flag is on, and if the positioning instruction (excluding the ABS
instruction) or the pulse output instruction (PLSR, PLSY) uses the same pulse output destination device,
the instruction cannot be executed.
After the instruction activation contact is turned off, if "pulse output monitor" (BUSY/READY) flag is still
on, do not execute the positioning instruction (including PLSR and PLSY instructions) having the same
output number.
Before activating such an instruction, check that "pulse output monitor" (BUSY/READY) flag is off, and
then wait until at least 1 scan time is completed.
Pulse output destination device
→ For details on the servo amplifier (drive unit), refer to the manual of your unit.
→ For details on lamp statuses, refer to Subsection 13.1.5.
→ For details on the pulse output method, refer to Subsection 4.6.1.
→ For details on the pulse output stop command flag, refer to Subsection 4.3.2.
Pulse output stop
command flag
M8349
M8359
M8369
M8379
→ For details on the normal and reverse rotation limits, refer to Subsection 4.3.1.
Forward limit Reverse limit
flag flag
M8343 M8344
M8353 M8354
M8363 M8364
M8373 M8374
Y000
Y001
Y002
Y003
13.3 If the Servo Motor or the Stepping Motor Does Not Operate
→ For output specifications, refer to Section 2.5.
Operation
During pulse outputting operation, if the pulse output stop
command flag of corresponding pulse output destination
device is turned on, the pulse outputting operation will be
immediately stopped.
Corresponding instruction and stop
PLSV instruction
(M8338 = OFF)
If the corresponding rotation
limit flag is turned on, pulse
output (operation) will be
immediately stopped.
Pulse output monitor flag
M8340
M8350
M8360
M8370
13 Troubleshooting
DSZR, DVIT, ZRN,
PLSV(M8338 = ON), DRVI,
and DRVA instructions
If the corresponding rotation
limit flag is turned on, the
speed will be reduced, and
then operation will be stopped.
B - 159
A
B
Apx.