AH54.00-P-0011-01MEV Note on High-Voltage System

AH54.00-P-0011-01MEV Note On High-voltage System
- Model 451.391/491

General
The high-voltage system consists of several components. The individual components are connected to each other by means of high-voltage conducting electrical lines.

Marking
All components of the high-voltage system are marked with a yellow adhesive warning label on which the pictogram for high- voltage is represented.
All high-voltage conducting electrical lines are identified by a warning color (orange).

Activities, general
All repair, maintenance and diagnostic activities on vehicles with a high-voltage system must always be performed by qualified employees (to be qualified to perform such activities, employees must have at least taken part in a special high-voltage awareness course).

Disabling (de-energization) of the high-voltage system before activities on the vehicle and subsequent reactivation following activities should only be carried out and documented by an "electrician for HV systems in passenger cars (series production vehicles)" who meets the following requirements:
- Trained "electrician for HV systems in passenger cars (series production vehicles)"
- Participation at a high-voltage basic training course
- Participation at a high-voltage product training course

Measures for work on high-voltage system
Before work is performed on high-voltage systems, the system must be disconnected from the voltage supply (de-energized) and it must be ensured that the de-energized state of the high-voltage system is maintained for the duration of the work being performed.

The following safety rules must be observed and applied:
- Enable (de-energized)
- Secure against switching on again
- Check and secure safe isolation from supply

For activities on high-voltage systems the following notes should be observed and adhered to:
- Check measuring instruments and aids before use to ensure that they are in perfect condition
- Protect cable lugs, contacts and electrical connectors against dirt by fitting suitable protective covers and insulating caps
- Before assembly, check contacts, electrical lines and electrical connectors for dirt and damage; clean or replace if necessary
- Tighten the screw contacts to the specified tightening torque and, if necessary, tightening angle
- Document the disabling and commissioning of a vehicle

Evaluation of high-voltage components

Checking wiring harness:
If the chafe protection on the high-voltage lines is damaged or the electrical lines themselves are damaged due to external influences (e.g. bitten by animals), the lines must be replaced immediately. Repair of the high-voltage lines is not permissible.

Checking after an accident:
Check the high-voltage system for external damage and defects. If damage or defects are found on the high-voltage components or along the high-voltage lines, these components and/or lines must be replaced. Repair of the high-voltage components or the high-voltage lines is not permissible.

Safety function after an accident:
- Shutdown of high-voltage system:
Automatic shutdown of the high-voltage battery and discharge of the high-voltage components is performed by means of an emergency switch. If a fault message is output, shutdown of the high-voltage system can be reversed by pressing the emergency switch.