Operating instructions Dcontrol Date 0730
TBL02_54-GB 0730 Part-No. 00153238-GB
Page 12 / 28
5.11 Sensor Connection (operation as a P-controller)
The signal from the sensor for detection of the actual value is connected to the terminals “E” or “E1”and “GND”, for
sensor in two-wire-technology (output 4-20 mA) to terminals "E" (E1) and "24 V". Be sure to observe correct polarity. The
maximum length of the connecting cable shall be 30 m (screened).
There is an integrated power supply (+24 V, I
max
120 mA) for e.g., a pressure sensor of the type DSF2-25 or MBG-30I.
Sensors with the following standard signals may be connected depending on the programming of the controller:
0-10 V, 4-20 mA, KTY10-6 (PTC temperature sensor).
5.11.1 Operation with a second sensor signal at input “E2” for dual circuit condensers (only for PKDM
..)
The entrance for a second sensor signal is activated over the switch 7 on Dipswitch “S1”.
Place the internal sliding switch “E1” or jumper “E2.1” and “E2.2” depending on signal in correct position (see description
for input “E1”).
By operation with a second sensor signal automatic regulation at the higher level
of the two analog inputs (selection
amplifier integrated e.g. for dual circuit condensers).
5.12 Switch over control function at Digital IN 2 (only for operation as P-controller)
For operation as P-controller an external switch over of control function is possible. When terminals “D2”-“D2” are
bridged, the device works with the opposite function than the set with Dipswitch 1 () 7.2.7).
5.13 Fault indications
An external fault indicator is available over the potential-free contacts of the built-in relay (contact load-carrying capacity
5 A, 250 V AC). The relay is energized if the controller is on mains supply, i.e. terminals “11” and “14” are bridged. If
there is a fault the relay is de-energized, i.e. terminals “11” and “12” are bridged.
- By switching off via enable ON/OFF (terminal “D1”) the relay is not
de-energized.
- By sensor failure (only in P-control operation) message only via the LEDs (yellow + green), the relay is not
de-energized.
A fault is indicated by:
A phase failure*, blown semiconductor fuse*, excessively high temperature at the unit, a defective controller-internal
voltage supply, overheating by the motor (thermostats or thermistors connected).
(* for “mobile application“ version, there is no error message for phase failure or blown semiconductor fuse!)
5.14 Voltage supply for external equipment
There is an integrated power supply e.g. for pressure sensors of the type DSF2-25 / MBG-30I.
Terminals + 24 V Output voltage tolerance ±20 %.
Max. on-load current 120 mA
In the event of overload or short circuit (24 V ↔ GND), the control voltage cuts out and hence switches off the control
unit.
Reconnection after solving failure cause:
♦ PKDT5: switch off line voltage and on again after cooling down the transformers.
♦ PKDM... incl. multifuse: automatic switch on.
5.15 Output voltage (0-) 10 V (needed only as required)
For operation as a P-controller () basic settings):
Output voltage 0-10 V, I
max
10 mA (terminals „A“/“GND“) is approximately proportional to the regulated output voltage.
This can be used for example, for a “slave controller” or for a valve-positioning motor.
For operation as a speed controller () basic settings):
Fixed 10 V, I
max
10 mA voltage for maintaining the speed from an external potentiometer.
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