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8
TROUBLESHOOTING
8.2 When the QD64D2 does not Start Counting
8 - 4
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
PROCEDURES AND
SETTINGS BEFORE
OPERATION
5
FUNCTIONS
6
UTILITY PACKAGE (GX
Configurator-CT)
7
PROGRAMMING
8
TROUBLESHOOTING
8.2 When the QD64D2 does not Start Counting
8.3 When the QD64D2 does not Normally Count
Table 8.6 When the QD64D2 does not start counting
Check item Action Reference
Do the LEDs of A and B turn ON by directly
applying a voltage to the pulse input terminals of
A and B using such as a voltage stabilizer?
If they turn ON, check the external wiring, encoder
side and so on, 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.
Section 4.3
Section 4.4
Is the external wiring of A and B correct?
Check the external wiring and correct the error.
Is the count enable command (Y06) turned ON?
Turn ON the count enable command (Y06) by the
sequence program.
Section 3.3.2
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.
Section 4.5
Section 5.1
Table 8.7 When the QD64D2 does not normally count
Check item Action Reference
Does the input pulse waveform meet the
performance specifications?
Check the pulse waveform with a synchronoscope.
When the input pulse does not meet the
performance specifications, input the pulse which
meets the performance specifications.
Section 3.1
When the count value that is same with another
channel is input, does the count result become
the same with that of another channel?
If they differ, it is a hardware failure. Please consult
your local Mitsubishi representative, explaining a
detailed description of the problem.
----
Noise
reduction
measures
Are the shielded twisted pair cables
used for pulse input wiring?
Use the shielded twisted pair cables for pulse input
wiring.
Section 4.4
Has the measures against noise been
taken to the adjacent devices and
inside the control panel?
Take noise reduction measures such as attaching
a CR surge suppressor to the magnet switch.
Is the distance between the high
voltage equipment and pulse input
line kept enough?
Bundle the pulse input lines and put them in a
single tube, and keep a distance of 150mm (5.91
inch) or more with the power line even inside the
control panel.
Does any noise come from the ground
part of the QD64D2?
Separate the ground cable of the QD64D2 from the
ground part.
If the QD64D2 case touches to the ground part,
separate it.
Are the count value data treated in 32-bit binary in
the sequence program?
Correct the sequence program so that the count
value data can be treated in 32-bit binary.
Section 3.4
CHAPTER 7
Is the preset performed out of the count range of
the ring counter?
(Only for the ring counter function)
Perform the preset within the count range of the
ring counter.
Section 3.4