25
Be in charge.
Super B.
D4
100 V 3 A,
might not be needed depends on
relay
F1
5A 100 V
F2
5 A 100 V
K1
Na
Depends on application
K2
Depends on application
R1
Depends on application, see 5.6.4
Table 12. Circuit description
5.6.2. Electrical installation - BCI externally powered
Figure 13 depicts a typical setup drawn of an externally powered Installation usually higher
than 48 V.
Figure 11. BCI externally powered
Circuit description
The BCI Is powered by the external power supply, through pin 1 (minus) and pin 10 (plus). The
coils of contactors K1, K2 and K3 are connected to the pre-charge driver, the main contactor
low and the main contactor high drivers of the BCI. D1, D2 and D3 are to absorb the back-
EMF of the contactor coils. Some contactors have built-in back-EMF diodes or transient
diodes. In that case it is advised not to install D1, D2 and D3. The pre-charge resistor should
be tailored to the application. See 5.6.4 for calculating the pre-charge.