WIKA CF2S - Manual (Page 44)

Operating Instructions Temperature Indicating Controller CF2S
V1.2 • 08/2004 - 44 -
13. Troubleshooting
If any malfunctions occur, refer to the following items after checking the
power supply on.
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 an Electric Shock which could cause severe injury or death.
Moreover, the instrument must be grounded before the power supply to the
instrument is turned on.
Phenomena Presumed cause and solution
If the PV display is
indicating [
]
or no indication.
• Control output OFF function is working.
Press the key for approx. 1s to release
the function. (page 31)
If [ ] is
blinking on the
PV display.
• Thermocouple or RTD is burnt out.
[In the case of Thermocouple]
If the input terminal between 8-10 of the
instrument is connected, 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 connected, 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.
If indication
of PV display
is abnormal or
unstable.
• Designation of the Sensor input is improper.
Set the Sensor input properly by the Rotary switch
(SW303) and the DIP switch (SW304).
(page 10, 11)
• Temperature unit (°C or °F ) is mistaken.
Set the unit properly by the DIP switch. (page 10)
• Sensor correcting value is unsuitable.
Set the value suitably. (page 21)
• Specification of the Thermocouple or RTD is improper.
• AC may be leaking into thermocouple or the RTD circuit.
• There may be an equipment producing an inductive
fault or noise near the controller.