WIKA CF2S - Manual (Page 45)

Operating Instructions Temperature Indicating Controller CF2S
V1.2 • 08/2004 - 45 -
<Key operation>
Phenomena Presumed cause and solution
If it is impossible to
set various values.
If the value does
not change by the
, keys.
• Setting value lock (mode 1 or 2) is designated.
Release the lock designation. (page 20)
• During PID auto-tuning.
Cancel the tuning if necessary. (page 16)
If the setting
indication does not
change in the rated
scale range even if
the
, keys
are pressed, and it
is impossible to set.
• Main setting value high limit or low limit may be set at
the point the value does not change.
Set it again by Auxiliary function setting mode 1.
If it does not start
even if the
key
is pressed in the
Program mode.
• Step time is not set.
Set the step time. (page 29, 30)
<Control>
Phenomena Presumed cause and solution
If process variable
(temperature) does
not rise.
• Thermocouple or RTD is burnt out.
[In the case of Thermocouple]
If the input terminals between 8-10 of the
instrument is connected, and if nearby room
temperature is indicated, the instrument should be
normal and sensor may be burnt out.
[In the case of RTD]
If approx. 100 Ω of resistance is connected
to the input terminals 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 sensor may be burnt out.
• Lead wire of thermocouple or RTD is not securely
mounted to the instrument terminal.
If it does not
control.
(Indicates only
PV display)
• Program mode is selected.
If running by Program mode, press the key.
When performing by Fixed value control, press the
key for approx. 3s while the key is
being pressed to select the Fixed value control
mode. (page 29)
If the main output
has kept its ON
status. • Main output low limit value is set to 100% or greater in
Auxiliary function setting mode 2.
Set the value appropriately. (page 24)
If the main output
has kept its OFF
status. • Main output high limit value is set to 0% or less in
Auxiliary function setting mode 2.
Set the value appropriately. (page 24)
If any unexplained malfunctions occur other than the above mentioned, make
inquiries at our agency or the shop where you purchased the unit.