10
G
Installation and Commissioning
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).
The measuring transducer compares the air velocity at the sensor with the set threshold at the potentiometer (0.1…20 m/s).
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 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 (0.1…20 m/s) 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
Connecting diagram
KHSSF-W
Connecting diagram
KHSSW-W24
Connecting diagram
KHSSW-W230
