Ford Electric Ranger 1998 Student Manual page 19

Contactor Box Assembly (CBA)
Contactor Box
1998 Ranger EV New Model Training
LESSON 1: VEHICLE OVERVIEW
•
The contactor box assembly (CBA) (arrow) is located in the rear of
the traction battery at the upper left side.
•
The contactor box serves as the on/off switches for the traction
battery.
•
Relays are used to interrupt the flow of high voltage when the
driver's key is turned to the OFF position, the inertia shutoff switch
is activated or the system is in shutdown mode actuated by an
electronic control module.
•
The contactor box supports these additional functions:
– high voltage circuit precharging – the high voltage circuits
require precharging. Otherwise, the large voltage differential
might weld contactors as circuits are switched on. Precharging is
accomplished through two relays and two 20-ohm resistors
located in the contactor box.
– traction battery current sensing – the contactor box contains two
Hall effect sensors that monitor the current from the traction
battery. One sensor monitors the current flow into the traction
inverter module (TIM) (power for the motor/transaxle),
and the other monitors current flow into the high voltage
auxiliary circuits.
– high voltage circuit protection – the charging, battery heater and
high voltage auxiliary circuits are protected by three fuses in the
contactor box.
1-11