Mitsubishi Electric QD62, User Manual

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MELSEC-Q
9 TROUBLESHOOTING
9.2 When the QD62(E/D) Does Not Start Counting
Check item Action
Doesn't the programmable controller CPU indicate an
error?
If the LED on the programmable controller CPU indicates an
error, correct the error with reference to troubleshooting in the
programmable controller CPU's manual for normal operation.
Do the LEDs of
φ
A and
φ
B turn ON by directly applying
voltage using such as voltage stabilizer to pulse input
terminals of
φ
A and
φ
B?
If they turn ON, check the external wiring and encoder side
and correct the error.
If they remain OFF, it is a hardware failure. Please consult
your local Mitsubishi representative, explaining a detailed
description of the problem.
Is the external wiring of
φ
A and
φ
B normal? Check the external wiring and correct the error.
Is the count enable command {Y04 (Y0C)} ON?
Turn the count enable command {Y04 (Y0C)} ON with the
sequence program.
Are the pulse input method and pulse input mode set with
the intelligent function module switch setting the same? Match the pulse input method with the pulse input mode made
on the intelligent function module switch setting.
Is the counter function selection start instruction {Y06
(Y0E)} ON or is voltage being applied to the function start
input terminals? If the disable count function has been set with the counter
selection function, turn OFF the counter function selection start
instruction {Y06 (Y0E)} or the function start input terminal.
Is an overflow error occurring? Preset to clear the overflow error.
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