WIKA CS4L - Manual (Page 47)

Operating Instructions Temperature Indicating Controller CS4H / CS4L
V1.1 • 05/2006 - 47 -
10. Troubleshooting
If any malfunctions occur, refer to the following items after checking the power of the controller.
Warning
Turn the power supply to the instrument off before wiring or checking.
Working or touching the terminal with the power switched on may result in Electric Shock
causing severe injury or death.
10.1 Indication
Problem Presumed cause and solution
The PV display is indica
ting [
].
• Control output OFF function is working.
Press the OUT /
OFF
key for approx. 1 second to release the function.
[ ] is blinking on t
he PV display.
• The sensor for thermocouple, RTD and DC voltage (0 ... 1 V DC) input
may be burnt out.
Replace each sensor.
How to check sensor burnout
[Thermocouple]
If the input terminal of the instrument is shorted, and if nearby room
temperature is indicated, the instrument should be normal and the
sensor may be burnt out.
[RTD]
If approx. 100 Ω resistance is connected to the input terminals be-
tween A-B of the instrument and between B-B is shorted, and if
nearby 0 °C (32 °F) is indicated, the instrument should be normal and
the sensor may be burnt out.
[DC voltage (0 ... 1 V DC)]
If the input terminal of the instrument is shorted, and if scaling low limit
value is indicated, the instrument should be normal and the signal wire
may be burnt out.
• Is the input terminal of thermocouple, RTD or DC voltage (0 ... 1 V DC)
securely mounted to the instrument terminal?
Connect the sensor terminal to the instrument terminal securely.
[ ] is blinking
on the PV display.
• The sensor for DC voltage (1 ... 5 V DC) or DC current (4 ... 20 mA DC)
input may be burnt out.
Replace each sensor.
How to check sensor burnout
[DC voltage (1 ... 5 V DC)]
If the input to the input terminal of this controller is 1 V DC and if
scaling low limit value is indicated, the controller should be normal
and the signal wire may be burnt out.
[DC current (4 ... 20 mA DC)]
If the input to the input terminal of this controller is 4 mA DC and
scaling low limit value is indicated, the controller should be normal
and the sensor may be burnt out.
• Is the input terminal of DC voltage (1 ... 5 V DC) and DC current (4 ... 20
mA DC) securely connected to the input terminal of this controller?
Connect the sensor terminal to the controller terminal securely.
• Polarity of thermocouple or compensating lead wire is reversed?
Do codes (A, B, B) of RTD agree with the controller terminal?
Wire them properly.