High Voltage Safety - Lexus LS 600hl Hybrid 2008 Emergency Response Manual

H igh Voltage Safety
The HV battery pack powers the high voltage electrical system with DC
electricity. Positive and negative orange colored high voltage power cables are
routed from the battery pack, under the vehicle floor pan, along the propeller
shaft and transmission tunnel to the power control unit. The power control unit
contains a circuit that boosts the HV battery voltage from 288 to 650 Volts DC.
The power control unit creates 3-phase AC to power the motor and generator
located in the transmission. Power cables are routed from the power control
unit to each high voltage motor (electrical motor, electric generator, and A/C
compressor). The following systems are intended to help keep occupants in the
vehicle and emergency responders safe from high voltage electricity:
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 electrical flow from leaving the HV
battery pack.
WARNING:
The high voltage system may remain powered for up to 10 minutes
after the vehicle is shut off or disabled. To prevent serious injury or
death from severe burns or electric shock, avoid touching, cutting, or
breaching any orange high voltage power cable or high voltage
component.
•
Both positive and negative power cables
body. High voltage electricity flows through these cables and not through
the metal vehicle body. The metal vehicle body is safe to touch because it
is insulated from the high voltage components.
•
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 hybrid vehicle computer
light in the instrument cluster and indicate "CHECK HYBRID
SYSTEM" on the multi-information display.
connected to the HV
. When the
are insulated from the metal
will illuminate the master warning
High Voltage Safety System – Vehicle Shut Off (READY-OFF)
High Voltage Safety System – Vehicle On and Operational (READY-ON)
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