BMW I01 Product Information page 18

I01￿High-voltage￿Components
2.￿Important￿Notes
The￿following￿graphic￿shows￿the￿design￿of￿the￿round￿high-voltage￿connector￿on￿the￿high-voltage
cable.
Design￿of￿the￿round￿high-voltage￿connector
Index
1
2
3
4
5
6
7
8
9
10
The￿bridge￿in￿the￿high-voltage￿connector￿serves￿for￿electrical￿safety.￿The￿signal￿of￿the￿high-voltage
interlock￿loop￿runs￿over￿this￿bridge￿when￿the￿high-voltage￿cable￿is￿connected￿to￿the￿high-voltage
component.￿For￿the￿connection￿of￿the￿high-voltage￿cable￿to￿the￿EKK￿and￿to￿the￿electric￿heating￿the
voltage￿supply￿of￿the￿EKK￿or￿transmission￿control￿unit￿runs￿via￿the￿bridge.￿If￿one￿of￿the￿circuits￿is
interrupted,￿this￿also￿results￿in￿an￿automatic￿interruption￿to￿the￿current￿flow￿(returns￿to￿zero)￿in￿the
respective￿high-voltage￿cable.￿As￿the￿two￿contacts￿of￿the￿bridge￿opposite￿the￿high-voltage￿contacts
advance,￿this￿measure￿constitutes￿protection￿against￿the￿formation￿of￿an￿electric￿arc￿when￿removing
the￿high-voltage￿connector.
2.4.￿Connections￿for￿potential￿compensation￿lines
The￿safety￿concept￿of￿the￿high-voltage￿system￿includes￿the￿measurement￿and￿monitoring￿of￿the
isolation￿resistance￿of￿the￿high-voltage￿cables￿to￿each￿other￿and￿against￿ground.￿This￿safety￿function
is￿performed￿in￿the￿I01￿of￿the￿SME￿control￿unit,￿but￿should￿identify￿isolation￿faults￿in￿the￿entire￿high-
voltage￿circuit.￿For￿this￿purpose,￿the￿housing￿of￿all￿high-voltage￿components￿must￿be￿connected
galvanically￿to￿ground.
12
Explanation
High-voltage￿cable
Actuation￿points￿on￿locking￿elements
Housing
Locking￿element
Connection￿1￿for￿bridge￿in￿the￿connector
Connection￿for￿shielding
High-voltage￿connection,￿pin 2￿(DC,￿minus)
Mechanical￿encoding
Connection￿2￿for￿bridge￿in￿the￿connector
High-voltage￿connection,￿pin 1￿(DC,￿plus)