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9. Causes and remedy of trouble and errors
9-1. Causes and remedy of trouble
Problem Cause Remedy
1) Error message is
displayed.
See “Causes and remedy of errors.” See “Causes and remedy of errors.”
2) Displayed measured
value (PV) seems to be
incorrect.
1) Set measuring range code is different
from that of input sensor/input signal.
2) Erroneous wiring to input terminals of
sensor.
1) Check if set measuring range code is the
same as input signal.
2) Check wiring to input terminals of sensor.
3) Front panel display goes
off and does not function.
1) Problem with power supply and/or
wiring connection.
2) Something is wrong with the
instrument.
1) Inspect power supply/wiring connections and
check wiring.
2) Inspect, repair or replace the instrument.
4) Keys do not work.
1) Key lock is in effect.
2) Something is wrong with the
instrument.
1) Cancel key lock.
2) Inspect, repair or replace the instrument.
5) ON-OFF action of control
output is too fast.
1) ON-OFF “hysteresis range” is too
narrow.
1) Widen ON-OFF “hysteresis range.”
9-2. Causes and remedy of errors
(1) Abnormal measured input
Screen
display
Problem Cause Remedy
(HHHH)
Higher limit scaleove
1) Break in thermocouple input wiring.
2) Break in RTD input A wiring.
3) Input measured value exceeded higher
limit of measuring range by 10%.
1) Check thermocouple input wiring for
possible break. If there is nothing wrong
with wiring, replace thermocouple.
2) Check RTD input A terminal wiring for
possible break. If there is nothing wrong
with wiring, replace RTD.
3) For voltage or current input, check the
measurement signal transmission unit.
Check if set measuring range code is
the same as input signal.
(LLLL)
Lower limit scaleover Input measured value fell below lower limit
of measuring range by 10%.
Check for measurement input wiring for
reverse polarity or possible break.
(b---)
Break in RTD input
wiring
1) Break in B wiring
2) Multiple break in ABB wiring
Check RTD input ABB terminal wiring for
possible break. If there is nothing wrong
with wiring, replace RTD.
}
(CJHH)
Higher limit scaleover
of cold junction (CJ) of
thermocouple input
Ambient temperature has exceeded 80°C. 1) Reduce ambient temperature to the
level provided in the environment
conditions for the product.
2) If ambient temperature has not
exceeded 80°C, examine the
instrument.
}
(CJLL)
Lower limit scaleover
of cold junction (CJ) of
thermocouple input
Ambient temperature has fallen below -20°C. 1) Raise ambient temperature to the level
provided in the environment conditions
for the product.
2) If ambient temperature has not fallen
below -20°C, examine the instrument.
When the controller does not operate as intended and you suspect it may be broken, read the instruction
manual and inspect once again.
If there is something wrong with the controller or there is something you do not understand, contact your
nearest Shimaden dealer.
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