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G U
Installation and Commissioning
Connecting diagram
FUNCTION
The supplied probe with the electronic sensor is firmly connected (see also connection diagram on housing side) to the top-hat rail housing via
a connection cable (KL = approx. 2.4 m / 3.3 f t).
The measuring transducer compares the air velocity at the sensor with the set threshold at the potentiometer.
The changeover contact closes when the threshold is reached or exceeded.
The integrated start-up override ensures trouble-free start-up (e.g. of the fan) and thus avoids unwanted fault messages (BMS).
START-UP OVERRIDE
There are application scenarios in which fan motors and measuring instruments are switched off and on again.
When switched on, the fans take a few seconds to build up a flow.
During this start-up time, the BMS could switch to fault mode (lack of flow).
For this reason, a start-up override of 60 s is permanently programmed into all unit types.
After the supply voltage is switched on, a flow of 20 m/s - 65.6 ft/s or greater than the set switching threshold during
this start-up time is assumed and the output signal is increased to 10 V or the relay is switched, depending on the type.
After the start-up time has elapsed, the unit switches to normal measuring mode.
SWITCHING POINT
The switching point for the changeover contact is set
via a potentiometer on the front of the housing.
LED STATUS INDICATOR
The current switching status of the changeover contact/relay and the operating
status of the unit is indicated via two LEDs on the front of the housing.
YELLOW LED
"Relay" (switching status):
Off
= Switching point not reached → Contact 5-6 open
Continuous light = Switching point reached → Contact 5-6 closed
Flashing
= Start-up override active
GREEN LED
"On ⁄Off" (operating status):
Continuous light = Readiness for operation of the measuring transducer
Flashing
= Error in sensor or sensor line
Automatic Output Switching
Patented analogue interface for automated output switching
(Patent no. DE 10 2015 015 941 B4)
Switching on the device will analyse the network connected to the outputs and set
the relevant output type U or I.
Network resistance > 15 kiloohms => U output 0–10 V
Network resistance < 450 ohms => I output 4...20 mA
KHSSF-W
Connecting diagram
KHSSW-W24
10
Connecting diagram
KHSSW-W230
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