Troubleshooting - Fuji Electric Micro-Controller X Socket type Operation Manual

4

Troubleshooting

When a trouble occurs, first check the model, wiring, and parameter settings. The following table shows some
typical cases and their solutions.
Symptoms
Parameters you want
to view do not appear
Control output is not
output even with the
power turned on
Keys do not work
The display has shown
"UUUU" or "LLLL"
Causes
Display mask is set.
The ramp soak settings have the
output turned OFF.
Standby mode is on.
Other than "0" is set in the parameter
of [LoC].
SV limit value is set.
The (USER) key settings have
changed.
The setting of [P-N2] is not correct for
the input signals of sensors or others.
The polarity of the sensor does not
match that of this controller.
Input terminals are short-circuited in
thermocouple B or R.
([P-N2]=" 4 ", " 5 ")
The connecting cables for the sensor
are loose.
A break or short-circuit occurred in
the sensor.
The sensor or other input devices that
are connected to this controller have
problems.
The set value of the parameter of [P-SL]
is larger than the value of [P-SU].
The process variable is too large or
too small.
Remedies
Check the DSP settings.
Check the ramp soak settings.
Check the output settings during
standby mode.
Check the key lock settings.
Check the SV limit value settings.
Check the (USER) key settings.
Set the parameter of [P-N2] correctly. Page 42
Correct the polarity of the sensor and
this controller.
Set the parameter of [P-N2] to " 3 ",
and check if the temperature around
an ordinary temperature is displayed.
(Thermocouples B and R have a large
error around ordinary temperatures.
However, this is not a fault.)
Tighten the connecting cables.
Replace the sensor with a new one.
Or remove the short-circuit.
Replace the sensor with a new one.
Or remove the short-circuit.
Set the parameters again so that the
value of [P-SL] is smaller than the
value of [P-SU].
Set the parameters again so that the
difference of the set values of [P-SL]
and [P-SU] is made larger.
73
Reference
pages
Page 68
Page 22
Page 55
Page 21
Page 29
Page 58
Page 70
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