SFA ZPS 2.3 Instrucciones De Manejo Y De Montaje página 16

3.2.4 Connection of the external sensors
The external sensors are connected by means of the terminal strip on the upper circuit board.
The active sensor can be selected in the menu "level control" and "therm. malfunction".
De-energized
open
If the thermostatic switches TH2 and TH4 are not necessary, bridges have to be inserted on those
contact points. The thermostatic switches TH1 and TH3 can be deactivated via the menu therm.
malfunction.
The floating switches have to close when they are floating on the surface. The floating switches
have to be connected floatingly. The required signal voltage is generated in the control system and
amounts to 5V.
Assignment of the float switches:
SWN1 = pumps 1 and 2 off
SWN2 = pump on
SWN1 = peak load 2
SWHW = high water alarm
For the usage in explosion-prone areas, either floating switches with the
corresponding permission, or intrinsically safe cut-off relays have to be
used.
The external sensor has to supply a measurement current between 4
and 20mA. The final value of 20 mA can be adjusted in the menu, so the
indication may occur in cm.
3.2.5 Utilisation of the internal sensor
An internal sensor, a pressure sensor 0 to 10 kPa is used (0 to 1mWs, 0 to 100 mbar). Other
measurement ranges can be realised on demand. On the lower side wall, a hose screw connection
6/8mm is located which is intended for the connection of the immersion pipe. The sensor used
is designed as a differential pressure converter, so that barometric variations are eliminated. The
Pump
De-energized
closed
Signal contacts
Floating
pump switched on
nd
Pump
Use the 20 V output for
external 4-20 mA sensor only
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