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CHAPTER 11 TROUBLESHOOTING
11
11.5 T
roub
leshooting for
E
a
ch Pheno
menon
11.5.5
Whe
n the setting
on the oper
ation mode setting is the PWM outpu
t mode
11.5.5
When the setting on the operation mode setting is the PWM
output mode
(1) When the module does not perform normally
Check item
Action
Does the CPU module indicate any error?
If an error is indicated with the CPU module, refer to troubleshooting
on the user's manual for the CPU module used.
Are Coincidence output 1 to 4 assigned properly?
Review the setting in Coincidence output channel assignment setting
(address: 0101
H
) and CH
PWM output assignment setting (RWw1D,
RWw35).
Is the external wiring to Coincidence output 1 to 4 terminals
(EQU1 to EQU4) correct?
Check the external wiring and correct errors.
Is a resistive load connected to the coincidence output 1 to 4
terminals (EQU1 to EQU4)?
Connect a resistive load since the output waveform is highly distorted
by connecting a load other than a resistive load.
Measures
against
noise
Are the shielded twisted pair cables used for PWM
output wiring?
Use the shielded twisted pair cables for PWM output wiring.
Are measures against noise taken for 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 PWM output line kept enough?
Bundle up the PWM output lines in a single tube, and keep a distance
of 150mm or more between the PWM output lines and the power line
even inside the control panel.
Does any noise come from the grounded part of the
high-speed counter module?
Separate the grounding cable of the high-speed counter module from
the grounded part.
If the case of the high-speed counter module touches the grounded
part, separate it.
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