YOKOGAWA F3CU04-0S, User Manual

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D2-2
IM 34M06H62-02E 2nd Edition : June 2008-00
(1) Input does not change, or fluctuates excessively
If input does not change, or fluctuates excessively, there may be a problem with sensor
connection, module usage, or register preset values. Follow the steps below to locate the
cause. Also see (3), "The loop is out of control (with an oscillating response)" if the
module is used as a controller.
- Confirm that the sensor is securely and correctly connected.
- Confirm that the registers are correctly set. See the table below.
Data Position Number
Symbol Content Check Items See Also
Loop 1 Loop 2 Loop 3 Loop 4
71 SETUP Setup
Is SETUP set to 1?
It must be set to 0.
B2.3
81 FREQ
Power frequency
selection
Is FREQ correctly set to match the frequency of
the power supply used?
It must be correctly set.
B3.1.1
82 SMP Input sampling period
Is the loop whose input does not change available
for use?
To use loops 3 and 4, Input sampling period
should be set to 200 ms.
B3.1.2
83 MD12
Controller mode
Is the loop whose input does not change available
for use?
If the loop is disabled, enable it.
B3.1.3
84 MD34
142 342 542 742 IN Input type selection
Is the input type appropriate for the sensor type
used?
Set the input type to match the sensor used.
B3.2.1
172 372 572 772 FL Input filter
Is excessive noise interfering with the input?
Set FL to an appropriate value.
C3.10