WIKA CS4L - Manual (Page 48)

Operating Instructions Temperature Indicating Controller CS4H / CS4L
V1.1 • 05/2006 - 48 -
Problem Presumed cause and solution
The value set during
the Scaling low limit
setting remains on the
PV display. • Is the sensor for DC voltage (0 ... 5 V DC, 0 ... 10 V DC) or DC current
(0 ... 20 mA DC) input burnt out?
Replace each sensor.
[How to check sensor burnout]
[DC voltage (0 ... 5 V DC, 0 ... 10 V)]
If the input to the input terminal of this controller is 1 V DC and if the
value corresponding to1 V DC is indicated, the controller should be
normal and the sensor 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
value corresponding to 1mA DC is indicated, the controller should be
normal and the sensor may be burnt out.
• Is the input terminal for DC voltage (0 ... 5 V DC, 0 ... 10 V DC) and DC
current (0 ... 20 mA DC) securely connected to the controller terminal?
Connect the sensor terminal to the controller terminal securely.
The indication of PV
display is abnormal or
unstable. • Designation of the sensor input or temperature unit (°C or °F) is im-
proper.
Set the sensor input and the temperature unit properly.
• Sensor correcting value is unsuitable.
Set the value suitably.
• Sensor specification is improper.
Set the sensor specification properly.
• AC may be leaking into the sensor circuit.
Change the sensor for the ungrounded type.
• There may be equipment which produces an inductive fault or noise
near the controller.
Keep equipment which produces an inductive fault or noise away from
the controller.
PV display blinks
[
].
The internal memory is defective.
Please contact our main office or dealers.
10.2 Key operation
Problem Presumed cause and solution
Settings (main setting
value, P, I, D,
proportional cycle,
alarm, etc.) are
impossible.
The value does not
change by the
▲ or ▼-
key.
• Setting value lock (Lock 1 or Lock 2) is designated.
Release the lock designation.
• During PID auto-tuning or auto-reset.
Cancel the auto-tuning if necessary.
Auto-reset ends in 4 minutes after started.
The setting indication
does not change in the
rated input even if the
▲
or
▼-
key is
pressed, and settings
are impossible.
• SV high limit or low limit may be set at the point the value does not
change.
Set it again during Auxiliary function setting mode 1.