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9 TROUBLESHOOTING
9.2 When the QD62(E/D) Does Not Start Counting
Check item
Doesn't the programmable controller CPU indicate an
error?
φ
φ
Do the LEDs of
A and
B turn ON by directly applying
voltage using such as voltage stabilizer to pulse input
φ
φ
terminals of
A and
B?
Is the external wiring of φ A and φ B normal?
Is the count enable command {Y04 (Y0C)} ON?
Are the pulse input method and pulse input mode set with
the intelligent function module switch setting the same?
Is the counter function selection start instruction {Y06
(Y0E)} ON or is voltage being applied to the function start
input terminals?
Is an overflow error occurring?
9 - 2
Action
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.
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.
Check the external wiring and correct the error.
Turn the count enable command {Y04 (Y0C)} ON with the
sequence program.
Match the pulse input method with the pulse input mode made
on the intelligent function module switch setting.
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.
Preset to clear the overflow error.
MELSEC-Q
9
9 - 2
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