Chino AL3000 SERIES, Instructions Manual

Page: 105 / 116

19-5
19.4. Troubleshooting
Troubleshooting methods are shown by symptoms. Read corresponding symptom items.
1. Not working
Check Causes and remedial measures
1) Check if power is supplied to power terminals. Turn on the external source power supply.
2) Check if the power supply is as specified.
Feed power supply as specified (100 to 240 VAC
50/60Hz).
3) Check if connections to power terminals are
correct.
Connect the cable to power terminals (L,N) correctly.
4) Try turning off and on the external source power supply.
5) Initialize the programmed values and check if the instrument is recovered to normal conditions.
See par.18.1.
(Caution) All programmed values become the default values. Program them again.
2. Measured values
Symptoms Causes and remedial measures
1) Measured values are
unstable.
･
Check measuring terminals for looseness.
･
Check if the input signal is unstable.
･
Check if the thermocouple is connected with another instrument in
parallel and the burnout function is programmed to [enabled].
2) Check if measured value is
displayed as shown below.
･
Check if input terminals are connected correctly.
･
Check input terminals for looseness.
･
Check if input signal wires are disconnected.
･
Check if the input signal exceeds the measuring range.
3) An error occurs
･
Check if °C/°F operation selection is correct.
･
Check if the input signal is correct.
･
Check if extension wire is connected to input terminals. (Thermocouple
input only)
･
Check the scale and adjust measured values, if an error is detected.
(Par. 16. 1)
4) Influences by ambient
temperature (Thermocouple
input only)
･
Check if RJ selection is 0 (disabled) in [range/printing range]
programming. (This is negligible if reference junction compensation is
executed externally.)
･
Check if the terminal cover is mounted.

Never repair or modify the instrument by replacing assembled component units or parts, otherwise
correct repair or modifications cannot be executed and also an electric shock accident or the damage of
the instrument may occur.
Repair and modifications
Warning