Operating instructions Dcontrol Date 0730
TBL02_54-GB 0730 Part-No. 00153238-GB
Page 23 / 28
8.4 Sensor-signal faults
Function only for operation as a P-controller
The unit is fitted with a built-in monitoring device for the sensor signal. A fault is signalled over the internal LEDs in the
event of a interruption or a short circuit in the sensor conductors, or measured values that are outside of the measuring
range for the unit.
For controllers model range PKDM
sensor monitoring is also for the second input “E2” (if activated by dipswitch).
Interruption / short circuit in the sensor leads or sensor values
measured that are outside of the measuring range
yellow + green
Cause for the signal “Sensor fault” and the response by the controller
1. For a temperature-dependent control (input for temperature sensor, type TF..):
• In the event of an interruption in the sensor leads.
The controller acts as in the case of an extremely high temperature, i.e. maximum output voltage.
(Control response for increasing speed for increasing actual value, see setting for operation reversed control
function (actual>set = n+)).
• In the event of a short circuit in the sensor leads.
The controller acts as in the case of a very low temperature, i.e. minimum output voltage.
(Control response for increasing speed for increasing actual value, see setting for operation reversed control
function (actual>set = n+)).
• In the case of temperatures at the sensor that are outside the measuring range of the controller,
- PKDT5: at approx. 0° C and as of approx. +80° C.
- PKDM5/10/12/15/25/35...: at approx. -25° C and as of approx. +75° C.
The controller functions automatically again with the value measured at the temperature sensor after the fault has
been rectified or when the actual temperature returns to within the measuring range of the controller.
2. For a pressure-dependent control (input 0-10 V / 4-20 mA):
• In the event of an interruption in the sensor leads or for a short circuit between the terminals “E“ and “GND“.
The controller acts as in the case of a very small measured value, i.e. minimum output voltage.
(Control response for increasing speed for increasing actual value, see setting for operation reversed control
function (actual>set = n+)).
• When the upper or lower limit of the measuring range for the sensor has been reached
-For a 4-20 mA input for a sensor signal of approx. 4 mA or approx. 20 mA
-For a 0-10 V input for a sensor signal of approx. 0 V or approx. 10 V
The controller functions automatically again with the value measured at the temperature sensor after the fault has
been rectified.
8.5 If controller doesn´t work correctly
Setting of dipswitch not under voltage!
If the device is on mains supply modifications will not be identified and realized.
It is forbidden to carry out work on electrically live parts. The enclosure rating of the device
when open is IP00! It is possible to inadvertently touch components carrying hazardous
voltages.
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