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Connecting the thermostatic switch
A thermostatic switch is built into the winding of every fan as standard. When connected, this switch
turns the engine off if voltage levels are exceeded and the internal temperature rises above 100 °C.
The motor gets too hot if the fan becomes locked, or similar.
Connecting the fan as shown in Figure 20 and 18 increases its life span. The thermostatic switch is
connected in series with the phase. The red line in Figure 20 is the connection between TB and U1.
PLEASE NOTE: This thermostatic switch has no hard reset, so when the engine has cooled
sufficiently it will restart. Therefore, always disconnect the plug from the power supply
during maintenance!
NB: an external protective device with a hard reset is available on request.
Figure 20 Wiring diagram
Figure 21 Connecting the thermostatic switch
