WIKA CS4R - Manual (Page 28)

Operating Instructions Temperature Indicating Controller CS4R
V1.2 • 05/2006 - 28 -
11. Troubleshooting
If any malfunctions occur, refer to the following items after checking the power supply to the controller.
11.1 Indication
Problem Presumed cause and solution
[ ] is blinking on
the PV display.
• The sensor of 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 between
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 input signal wire for DC voltage (1 … 5 V DC) or DC current
(4 … 20 mA DC) may be burnt out.
Replace each input signal wire.
How to check input signal wire 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 if scaling
low limit value is indicated, the controller should be normal and the signal
wire may be burnt out.
• Is the input signal wire for DC voltage (1 … 5 V DC) and DC current
(4 … 20 mA DC) securely connected to the input terminal of this controller?
Connect the input signal wire 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.
The value set during
the Scaling low limit
setting remains on the
PV display. • Is the input signal wire for DC voltage (0 … 5 V DC, 0 … 10 V DC)or DC
current (0 … 20 mA DC) burnt out?
Replace each input signal wire.
How to check input signal wire burnout
[DC voltage (0 … 5 V DC, 0 … 10 V DC)]
If the input to the input terminal of this controller is 1 V DC and if the
corresponding value is indicated, the controller should be normal and the
signal wire may be burnt out.
[DC current (0 … 20 mA DC)]
If the input to the input terminal of this controller is 1 mA DC and if the
corresponding value is indicated, the controller should be normal and the
signal wire may be burnt out.
• Is the input signal wire for DC voltage (0 … 5 V DC, 0 …10 V DC) and
DC current (0 … 20 mA DC) securely connected to the input terminal of this
controller?
Connect the signal wire to the controller terminal securely.