Operation
Vacuum Pumps N 920 APE-W and N 920 APDC-B
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Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19
Fig. 13: Scaled control-voltage/speed curve (optional)
8.2.1.2. Speed output (.29 versions)
Speed is outputted through the 8-pin controller connection (yellow
wire, see Tab. 12).
The motor controller generated speed-synchronized pulse-width
modulation (see Fig. 14).
Fig. 14: Analog speed output (standard)
Optional speed output
The motor controller generates a speed-synchronized right-angle
frequency with 5V TTL level (see Fig. 15).
Fig. 15: Digital speed output (optional)
8.2.2. Remote ON/OFF (.29 versions)
Remote ON/OFF is through an 8-pin controller connection (green
wire, see Tab. 12).
To start the motor, the green wire must be bridged to the
ground of the controller connection (grey wire, blue wire or or-
ange wire).
Speed output
Remote ON/OFF
