1 2
3
4
Fig. 4:
Circuit board with terminals
1 Trimmer
3
Terminal block ST1B (control signals)
2 LED for error code display
4
Terminal block ST1A (voltage supply)
Rotation speed set value
Terminal block ST1B
V+
V-
PWM
A
B
External through PWM signal
-
black
red
-
-
External through analog voltage
red
black
-
-
-
Internal via trimmer
-
-
-
-
-
Cable cross-section = 0.25 mm
2
Tbl. 5:
Overview of connections on terminal block ST1B
5.4.1 Establishing connections to the rotation speed setting
Trimmer priority
The trimmer has priority over the control signals.
Required tool
● Slot screwdriver
Connecting the external PWM signal
1. Turn the trimmer to the left stop.
2. Connect the corresponding terminals of terminal block ST1B.
– The control cable (red/black) is firmly connected to the connecting socket on the diaphragm
pump.
3. For a user-specific rotation speed preset, use the control cable to apply an electrically isolated
PWM signal to terminal block ST1B.
– 5 V to 24 V (mandatory), boundary frequency: > 100 Hz, < 1.5 kHz
Connecting analog voltage
1. Turn the trimmer to the left stop.
2. Connect the corresponding terminals of terminal block ST1B.
– The control cable (red/black) is firmly connected to the connecting socket on the diaphragm
pump.
Installation
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