Installing The Pilot Wire - Rittal SK 3138000 Assembly And Installation Instructions Manual

4. Electrical connection
4.2

Installing the pilot wire

– To control the EC roof-mounted fans via
an external control unit (e.g. SK 3235440),
types SK 31405xx have additional con-
nections for the pilot wire.
◾ Release and remove the jumper between
the "+10 V" and "0 – 10 V/PWM" (termi-
nals 1 and 2) connections.
◾ Use a screwdriver with a 3.5 x 0.5 mm
blade.
◾ Open the terminal with the screwdriver
and insert the connection cable as shown
in the connection diagram.
◾ Remove the screwdriver.
– To operate without a pilot wire, the jumper
should be left in the connection terminal.
The unit will then be operated at maximum
speed.
Fig. 4: Pilot wire
1 Max. speed (as delivered, with jumper between the "+10 V" and "0 – 10 V/PWM" connections.
2 Adjustable speed
3 Adjustable speed via PWM 1 – 10 kHz
4 Adjustable speed via potentiometer
14
0 – 10 V/
+10 V
PWM
0 – 10 V/
GND
PWM
+10 V
0 – 10 V/ 0 – 10 V/
PWM PWM
GND GND
0 – 10 V/
PWM
Rittal roof-mounted fan