2 — INSTALLATION AND WIRING
Curtis AC F4-A Motor Controller – August 2020 Return to TOC
pg. 4
HIGH CURRENT CONNECTIONS
ere are ve high-current connections identied on the controller cover as B+, B–, U, V, and W.
Install the controller with a (main) contactor between the traction battery positive terminal and the
B+ terminal. is wiring circuit shall also be tted with a fuse (the fuse amperage rating to match
the application).
Terminal Function
B+ Positive Battery to Controller
B– Negative Battery to Controller
U Motor Phase U
V Motor Phase V
W Motor Phase W
Table 1 High Power Connections
Working on electrical systems is potentially dangerous. Protect personnel and property
against uncontrolled operation, high current arcs, and outgassing from lead-acid batteries:
UNCONTROLLED OPERATION — Some conditions could cause the motor to run out of control.
Disconnect the motor or jack up the vehicle and get the drive wheels off the ground before
attempting any work on the motor control circuitry.
HIGH CURRENT ARCS — Batteries can supply very high power, and arcing can occur if the
terminals are short-circuited. Always open the battery circuit before working on the motor
control circuit. Wear safety glasses, and use properly insulated tools to prevent shorts.
LEAD-ACID BATTERIES — Charging or discharging generates hydrogen gas, which can build
up in and around the batteries. Follow the battery manufacturer’s safety recommendations.
Wear safety glasses when servicing, charging and working around the battery.
LITHIUM ION BATTERIES — Follow the battery manufacturer’s “safety precautions for the
Lithium Ion battery pack.” Wear safety glasses when servicing, charging and working around
the battery.
CAUTION
PRECAUTIONS
Take the steps during the application’s design and development to ensure that the EMC performance
complies with applicable regulations; Appendix B presents some design considerations for
EMC mitigation.
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