WIKA CF1H - Manual (Page 71)

Operating Instructions Temperature Indicating Controller CF1H
V 1.2
•
01/2007 - 71 -
13. Troubleshooting
If any malfunctions occur, refer to the following items after checking the power and the wiring.
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, which can cause severe injury or death.
Moreover, the instrument must be grounded before the power supply to the
instrument is turned on.
Phenomenon Presumed cause and the action
If the PV display is
indicating [
]
or no indication.
• Control output OFF function is working.
Press the OUT /
OFF
key for approx. 1s to release
the function. (page 37)
If [
] is
blinking on the
PV display.
• Thermocouple or RTD is burnt out.
[In the case of 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.
[In the case of RTD]
If approx. 100 Ω of resistance is connected
to the input terminal 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.
• Lead wire of thermocouple or RTD is not securely
mounted to the instrument terminal.
If [ ] is
blinking on the
PV display.
• Polarity of thermocouple or compensating lead wire
is reversed.
• Codes (A, B, B) of RTD do not agree with the
instrument terminal.