40
3
Troubleshooting
When trouble arises with the unit, check and remove the cause referring to the following table of
troubleshooting.
Trouble
Data are not displayed.
(1)
(2)
(3)
Power is not supplied.
Unit is not connected to connector.
Instrument is in trouble.
(1)
(2)
(3)
Check powre source.
Connect unit firmly to connector.
Replace instrument or contact your dealer
for advice.
PV display is
or
.
(1)
(2)
(3)
Measured value is very high or low.
Input is not connected.
Sensor is damaged.
(1)
(2)
(3)
Check temperature of controlled object.
Connect input terminal.
Replace sensor or contact your dealer for
advice.
Data are not changed at
press of key.
(1)
(2)
Unit is set in the position where parameter
cannot be changed.
Unit is set over data setting range.
(1)
(2)
Check set value of paremater LoC (Page 22).
Check set values of parameter P-SL (Page29)
and P-SU (Page 29)
HB lamp ON
(1) Lamp is ON at detection of heater burnout.
(1) Remove the cause of heater burnout.
Control output is not ON
when output lamp (C1,
C2) is ON.
(1)
(2)
Output is disconnected.
Instrument is in trouble.
(1)
(2)
Check connection of output terminal.
Replace instrument or contact your dealer
for advice.
Hunting of PV
(1)
(2)
(3)
(4)
Input filter time constant is small.
Hysteresis is very large for 2-position action.
Control output proportional cycle is very
large.
Improper adjustment of PID
(1)
(2)
(3)
(4)
Check set value of parameter P-dF (Page 26).
Check set value of parameter HYS (Page 12).
Check set value of parameter TC (Page 11),
and TC2 (Page 16) control otuput 2.
Perform auto-tuning (Page 15).
Auto-tuning is not
finished.
(1)
(2)
(3)
Wrong wiring
Wrong setting of normal/reverse action of
controller
Time constant of measured object is very
long.
(1)
(2)
(3)
Check wiring between control object and
controller.
Check set value of parameter P-n1 (Page 25).
It takes time for time constant. Wait until
it is set.
Cause
Remedy
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