If The Servo Motor Or The Stepping Motor Does Not Operate - Mitsubishi Electric FX3S Series User Manual

FX /FX /FX
3S 3G 3GC
Built-in Positioning Functions
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) Verify that the same pulse output method is being applied for both the PLC and the servo amplifier (drive
unit).
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
5) Check that the limit switch (forward or reverse rotation limit switch) is not activated.
The following table shows the forward and reverse limit relays of each pulse output destination device
(Y000, Y001, Y002, Y003).
Pulse output
destination
6) Check the operation timing of the positioning instruction.
If the "pulse output monitor" (BUSY/READY) flag is on, and if a positioning instruction (excluding the ABS
instruction) or pulse output instruction (PLSR, PLSY) uses the same pulse output destination device, the
instruction cannot be executed.
If the "pulse output monitor" (BUSY/READY) flag is still on after the instruction activation contact is turned
off, do not execute a positioning instruction (including PLSR and PLSY instructions) that uses the same
output number.
Before activating such an instruction, check that the "pulse output monitor" (BUSY/READY) flag is off,
and then wait until at least 1 scan time is completed.
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/FX /FX PLC User's Manual - Positioning Control Edition
3U 3UC
For details on the servo amplifier (drive unit), refer to the manual of your unit.
For details on high-speed output special adapter setting method, refer to Subsection 4.5.2.
For details on the pulse output stop command flag, refer to Subsection 4.3.2.
Pulse output stop
device
Y000
Y001
Y002
Y003
For details on the normal and reverse rotation limits, refer to Subsection 4.3.1.
Forward limit
relay
device
Y000 M8343
Y001 M8353
Y002 M8363
Y003 M8373
Pulse output destination device
Y000
Y001
Y002
Y003
search engine
13.3 If the Servo Motor or the Stepping Motor Does Not Operate
For output specifications, refer to Section 2.5.
For details on lamp statuses, refer to Subsection 13.1.5.
For details on the pulse output method, refer to Subsection 4.6.1.
command flag
M8349
During pulse outputting operation, if the pulse output stop
M8359
command flag of a corresponding pulse output destination
device is turned on, the pulse outputting operation will be
M8369
immediately stopped.
M8379
Reverse limit
PLSV instruction
relay
(M8338 = OFF)
M8344
If the corresponding rotation
M8354
limit relay is turned on, the
pulse output (operation) will
M8364
immediately stop.
M8374
Pulse output monitor flag
M8340
M8350
M8360
M8370
Operation
Corresponding instruction and stop
DSZR, DVIT, ZRN, PLSV
(M8338 = ON), DRVI, and
DRVA instructions
If the corresponding rotation
limit relay is turned on, the
speed will decelerate, and the
operation will stop.
13 Troubleshooting
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