The pump does not work if:
n
the cable is connected and pin 1 and pin 4 are open.
The pump works if:
n
the cable is connected and pin 1 and pin 4 are connected.
n
no cable is connected.
The pump performs one or more strokes if:
n
Pin 2 and pin 4 are connected to each other for at least 20 ms.
At the same time, pin 1 and pin 4 must also be connected to
each other.
n
The metering pump makes its first metering stroke at approx.
0.1 mA (4.1 mA) and enters into continuous operation at
approx. 19.9 mA.
The pump works at a pre-set stroke rate if:
n
Pin 5 and pin 4 are connected to each other. At the same time,
pin 1 and pin 4 must also be connected to each other. The aux‐
iliary frequency is factory-preset to the maximum stroke rate.
9.3.2 "Level switch" terminal
There is a connecting option for a 2-stage level switch with pre-
warning and limit stop.
Electrical interface
Data
Value Unit
Voltage with open contacts
5 V
Input resistance
10 kΩ
Control via:
n
potential-free contact (load: 0.5 mA at 5 V) or
n
Semiconductor switch (residual voltage < 0.7 V)
Pin
Function
3-wire cable
1
Earth GND
black
2
Minimum pre-
warning
blue
3
Minimum limit stop
brown
"Pause" function
"External contact" operating mode
"External Analogue" operating mode
"Auxiliary frequency" operating mode
3
2
1
P_BE_0016_SW
Fig. 11: Pump assignment
3
1
2
P_BE_0017_SW
Fig. 12: Cable assignment
Electrical installation
34
