15 - 11
MELSEC-Q
15 TROUBLESHOOTING
Related buffer memory
address
Axis 1 Axis 2 Axis 3 Axis 4
Set range
(Setting with sequence program)
Remedy
— — — — — —
— — — — — Check that there is no influence from noise.
— — — — —
Review the sequence program which turns ON/OFF
PLC READY signal (Y0).
— — — — —
Check the power, wiring, and connector connection
status of the drive unit.
— — — — —
• Check the power, wiring, and connector connection
status of the drive unit.
• Check the values in
Pr.22
Input signal logic
selection.
• When a drive unit without READY signal output is
used, wire the system so that the drive unit READY
signal input of the QD75 is always ON.
— — — — —
Check that there is no error on the personal computer
side I/F to which a cable is connected.
— — — — —
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 upper limit signal (FLS) will not turn OFF.
— — — — —
• Check the wiring of the upper limit signal (FLS).
• 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 upper
limit signal (FLS) input of the QD75 is always ON.
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