Chino DB600 Series, Instruction Manual

Page: 138 / 150

[DB600] General instruction manual
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8-3 Troubleshooting
Symptom Check item
There is an error in
measured value (PV)
or PV is unstable

Check that the wiring to the sensor is done properly.

For thermocouple, check that the wiring is done to the terminal screw
with thermocouple or compensation lead wire.

Check that the terminal screws are tightened firmly.

Check that the sensor signal is not connected in parallel with other
instrument.

Check that a protection element, etc. is connected to the sensor signal
and the resistance remains at a low level.

Check that there is no problem in the output signal or output
specifications (resistance, etc.) of the sensor itself.

Check that there is no noise influence.

Check that the operating environment or atmosphere (ambient
temperature, wind, etc.) is appropriate.

Check that the parameters (measuring range and sensor correction) are
set correctly.

When thermocouple range is measured by a calibrator, normal
measurement may not be performed due to variation of output voltage
of the calibrator. Check the connection and caution of the instruction
manual of the calibrator with the check items of the above.
PV display shows
"
"

Indicates over range or upper limit burnout for the measuring range.
Check the sensor signal.
PV display shows
"
"

Indicates under range for the measuring range.
Check the sensor signal.
Control is unstable

Check that the wiring is done properly.

Check that the terminal screws are tightened firmly.

Check that there is no noise influence.

Check that the parameters (PID, output limiter, etc.) are set correctly.
Cause unknown but
instrument behaves
strangely

Check that the parameters are set correctly.

If it does not help solve the problem, initialize the settings. Do all the
settings again and check that the problem is eliminated.
If the above troubleshooting does not improve the situation, contact the dealer (who does instrumentation
or installation work, or sells the product) or your nearest CHINO office.
Warning
Contact the dealer or your nearest CHINO office when repair or
modification is needed. Only our authorized service engineers are
allowed to replace the parts or repair/modify the instrument.
The set data may be lost if an unexpected trouble (blackout,
earthquake and other unexpected accidents) occurs while the
instrument is repaired. Make sure to back up the set data before
sending the instrument for repair.
We will not be responsible for lost data under any circumstances.
！