LG RCWW Operation & Maintenance Manual page 110

8. TROUBLESHOOTING
110
4mA~20mA, 2-line type sensor and controller power are used.
Check whether the wiring between sensor and controller is correctly connected.
4~20mA current input sensor problem
occurred (pressure sensor)
Check if the setting value is properly set in
sensor setting menu at 20mA.
N
Set the setting
Is the setting correct?
value again.
Measure current of the circuit.
(Refer to Figure 1)
N
Is the wiring correctly
connected?
Wiring defect
Y
Y
Is the current value proportional to the
measurement value?
Master board / slave board /
display board problem
N
Measure the current of the sensor
(Refer to Figure 2)
Sensor problem
N
- Check the auxiliary power
Is the current of the
sensor normal? - If the auxiliary power is
normal, replace the sensor.
Y
Check whether the wiring between sensor
and controller is correctly connected.
Figure 64 Pressure sensor