Installation Instructions
30.10.12 Kapitel/Chapter 6: Installation Instructions Seite/Page 85
Fig. 6.11-1:
6.12 Brief description
Temperature-dependent continuous speed controlling device for one or two DC-fans.
6.12.1 Function
The speed regulation of the fan is made by pulse tracing modulation (PWM) of the operating voltage. Pulse/no pulse
ratio becomes over an external temperature sensor (NTC resistance to attach at clamp 7 and 8) dependent on the
coolant temperature. Between the lower limit temperature (starting temperature) and the upper limit temperature the
fan is controlled with 30 to 100% of the available operating voltage (PWM = 30% to 100%).
Potentiometer for adjustment concerning temperature and PWM behaviour
Poti Start: Adjusting the starting temperature (fan start-up). The start temperature is with left stop 60°C and with right stop 80°C. Ex
factory a starting temperature of 70°C is adjusted (potentiometer position: In the middle).
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