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48
Troubleshooting
Section 5-5
5-5
Troubleshooting
The following tables explain the probable causes of troubles that may occur,
and the countermeasures for dealing with them.
Conversion Data Does Not Change
Value Does Not Change as Intended
Conversion Values are Inconsistent
Probable cause
Countermeasure
Page
The span adjustment value is set to 0. Set the span adjustment value to a value other than 0.
P. 34
The input type setting is incorrect.
Check and correct the input type setting.
P. 33
An input device is faulty, input wiring is
incorrectly wired, or wiring is discon-
nected.
Check whether the input value is changing.
Check for faulty or disconnected wiring.
Check whether a sensor error has been detected.
P. 19, P, 36
The minimum and maximum values for
process value scaling are either the
same or are set too close together.
Set the minimum and maximum process value scaling values cor-
rectly.
P. 35
Probable cause
Countermeasure
Page
The zero/span adjustment values are
incorrect.
Check and correct the zero/span adjustment settings.
P. 34
There is an error in the scaling set-
tings.
Check and correct the scaling settings.
P. 35
A resistance thermometer’s input wir-
ing is incorrect.
Check and correct the input wiring.
P. 19
The compensating wire is too long and
affecting operation.
Use a thicker thermocouple compensating wire.
---
The input type or process value scal-
ing setting is incorrect.
Check the input type or process value scaling settings and correct if
necessary.
P. 33, P. 35
Cold junction compensation is not
operating.
Check the Cold Junction Sensor Error Flag.
P. 39
No compensating wire is being used,
or another type of compensating wire
is being used.
Use the correct thermocouple compensating wire.
---
The input wiring is faulty. (The polarity
is incorrect in the thermocouple or
compensating wire.)
Check and correct the input wiring.
P. 19
Probable cause
Countermeasure
Page
The input signals are being affected by
external noise.
Change the connection paths of the input signal lines. (Separate
them from sources of noise or use shielded twisted cable.)
Insert a 0.01-µF to 0.1-µF ceramic capacitor or film capacitor
between the input’s (+) and (
−
) terminals.
---
The process value is being scaled
beyond the Unit's resolution.
Reduce the process value’s scaling value.
P. 35
Summary of Contents for SYSMAC CJ1W-AD04U
Page 3: ...iv...
Page 5: ...vi...
Page 9: ...x...
Page 13: ...xiv...
Page 61: ...42 Expansion Setting Area Section 4 3...
Page 69: ...50 Dimensions Appendix A...