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
Fig. 11: Pump assignment
Fig. 12: Cable assignment
Electrical installation
34
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