Lexus KMA10 Series, Руководство по демонтажу

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11
High Voltage Safety
The traction battery assembly powers the high voltage electrical system with DC electricity.
Positive and negative orange colored high voltage power cables are routed from the traction
battery assembly, under the vehicle floor pan, to the drive unit (inverter and motor) and DC/DC
converter. The inverter contains a circuit that boosts and inverts the 355.2 Volts DC from the
traction battery assembly to 500 Volts AC to power the motor. The inverter with converter
assembly creates 3-phase AC to power the motor. Power cables are routed from the inverter
with converter assembly to each high voltage motor (electric motor, electric heater, and
compressor with motor assembly). The following systems are intended to help keep occupants
in the vehicle and emergency responders safe from high voltage electricity:
High Voltage Safety System
•
Positive and negative high voltage power cables

* connected to the traction battery
assembly are controlled by 12 Volt normally open relays (system main relays

*). When
the vehicle is shut off, the relays stop electrical flow from leaving the traction battery
assembly.
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 opening any orange high voltage
power cable or high voltage component.
•
Both positive and negative power cables

* are insulated from the metal 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 in the electric vehicle computer

* continuously monitors for high
voltage leakage to the metal chassis while the vehicle is running. If a malfunction is
detected, the electric vehicle computer

* will illuminate the master warning light in
the instrument cluster and indicate “EV System Malfunction” on the multi-information
display.
•
The traction battery assembly contactors will automatically open to stop electricity flow in a
collision sufficient to activate the SRS.
*Numbers apply to the illustration on the following page.