8
TROUBLESHOOTING
8.3 When the QD63P6 Does Not Normally Count
8
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1
OVE
R
VI
EW
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SYS
TEM
CONFIGURA
T
ION
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SP
ECIFI
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A
T
IO
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PRO
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EDURES AND
SETT
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BEFO
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PERA
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FUNCTIONS
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UTIL
IT
Y P
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K
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(G
X Conf
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rat
or-CT)
7
PROGRA
MMING
8
T
R
OUB
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ES
HO
O
T
ING
8.3
When the QD63P6 Does Not Normally Count
Table 8.7 When the QD63P6 does not normally count
Check item
Action
Reference
Does the input pulse waveform meet the performance
specifications?
Check the pulse waveform with
synchronoscope. When the input pulse does
not meet the performance specifications,
input the pulse which meets the performance
specifications.
Is the maximum speed of input pulse within the range of
the counting speed made on the intelligent function
module switch setting?
Correct the counting speed setting in the
intelligent function module switch setting to
meet the maximum speed of the input pulse.
When the count value 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.
Has the measures against noise been
taken to the adjacent devices and
inside the control panel?
Take noise reduction measures (e.g. attach 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 150
mm (5.91 inch) or more with the power line
even inside the control panel.
Doesn't any noise come from the
ground part of the QD63P6?
Separate the ground cable of the QD63P6
from the ground part.
When the QD63P6 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.