Mitsubishi QD75P1N - Page 651

15 - 13
MELSEC-Q
15 TROUBLESHOOTING
Related buffer memory
address
Axis 1 Axis 2 Axis 3 Axis 4
Set range
(Setting with sequence program)
Remedy
— — — — —
After making an axis error reset (refer to [3] in Section
15.2), perform manual control operation (refer to
CHAPTER 11) to move the axis to the other position in
order that the lower limit signal (RLS) will not turn OFF.
— — — — —
• Check the wiring of the lower limit signal (RLS).
• Check if the values in
Pr.22
Input signal logic
selection meet the specifications of the limit switch.
• In a system which does not require a hardware stroke
limit (limit switch), wire the system so that the lower
limit signal (RLS) input of the QD75 is always ON.
— — — — —
The start timing is reviewed so that the operation starts
after the stop command is reset.
• Output signals to QD75
Axis 1: Y4, Axis 2: Y5, Axis 3: Y6, Axis 4: Y7
• External input
Connectors for external device connection:
Stop signals (STOP)
— — — — —
Turn ON the PLC READY signal (Y0) with the BUSY
signals of all axes OFF.
78 228 378 528
<OPR retry>
0, 1
• Validate the OPR retry function
(set value: 1). (Refer to Section 12.1.1)
• Move the workpiece from the current position (on OP)
using the manual control operation (refer to
CHAPTER 11), then carry out a machine OPR again.
74
75
224
225
374
375
524
525
• Lower the OPR speed.
• Increase the dog signal input time.
(Refer to Section 8.2.3)
74
75
224
225
374
375
524
525
• Lower the OPR speed.
• Input external zero signals during the movement at a
creep speed.
(Refer to Section 8.2.5)
74
75
224
225
374
375
524
525
<OPR speed>
QD75P
N/QD75D N:
1 to 4000000 [pulse/s]
1 to 2000000000
[
×
10
-2
mm/min or others]
QD75P /QD75D :
1 to 1000000 [pulse/s]
1 to 2000000000
[
×
10
-2
mm/min or others]
79 229 379 529
<OPR dwell time>
0 to 65535
• Lower the OPR speed.
• Increase the OPR dwell time.
(Refer to Section 8.2.4)
80
81
230
231
380
381
530
531
<Movement amount setting after
near-point dog ON>
0 to 2147483647
74
75
224
225
374
375
524
525
<OPR speed>
QD75P N/QD75D N:
1 to 4000000 [pulse/s]
1 to 2000000000
[
×
10
-2
mm/min or others]
QD75P /QD75D :
1 to 1000000 [pulse/s]
1 to 2000000000
[
×
10
-2
mm/min or others]
• Calculate the movement distance using a speed limit,
OPR speed, and deceleration time, and set the
movement amount after near-point dog ON so that
the distance becomes a deceleration distance or
longer.
• Lower the OPR speed.
• Adjust the near-point dog position so that the
movement amount after near-point dog ON becomes
longer. (Refer to Section 8.2.7, 8.2.8)