High Voltage Safety - Lexus RX 400h Hybrid 2007 Emergency Response Manual

High Voltage Safety

The HV battery pack powers the high voltage electrical system with
DC electricity. Positive and negative high voltage power cables are
routed from the battery pack, under the vehicle floor pan, to the
inverter/converter. The inverter/converter contains a circuit that boosts
the HV battery voltage from 288 to 650-Volts DC. The inverter creates
3-phase AC to power the motors. A set of 3 power cables is routed
from the inverter to each high voltage motor (electric motor, electric
generator, A/C compressor, and optional 4WD rear motor). Occupants
in the vehicle and emergency responders are separated from high
voltage electricity by the following system:
High Voltage Safety System
•
A high voltage fuse provides short circuit protection in the HV battery
pack.
•
Positive and negative high voltage power cables
battery pack are controlled by 12-Volt normally open relays
vehicle is shut off, the relays stop electricity flow from the HV battery
pack.
WARNING:
•
Power remains in the high voltage electrical system for 5
minutes after the HV battery pack is shut off.
•
Never touch, cut, or open any orange high voltage power cable
or high voltage component.
•
Failure to follow these warnings can cause severe burns and
electric shock that may result in death or serious injury.
•
Both positive and negative power cables
chassis, so there is no possibility of shock by touching the metal chassis.
•
A ground fault monitor continuously monitors for high voltage leakage
to the metal chassis while the vehicle is running. If a malfunction is
detected, the vehicle computer
in the instrument cluster and indicate "CHECK HYBRID SYSTEM"
on the Multi-information Display.
connected to the HV
. When the
are isolated from the metal
will illuminate the master warning light
•
The HV battery pack relays will automatically open to stop electricity
flow in a collision sufficient to activate the SRS or rear collision sensors.
12-Volt
Battery
Inverter Boost
Electric Converter
Motor
High Voltage Safety System – Vehicle Shut Off (READY-off)
12-Volt
Battery
Inverter Boost
Converter
Electric
650
Motor
Volt
High Voltage Safety System – Vehicle On and Operational (READY-on)
11
- -
Hybrid
ECU
0.0
Volt
HV Battery Pack
HV Battery Module
Hybrid
ECU
288
Volt
288
Volt
HV Battery Pack
HV Battery Module
Electric
Motor
(Rear)
Electric
Motor
(Rear)