On-board electrical system/power supply
22
Electrical system
Introduction of smart fortwo electric drive (3rd Generation) • Model Series 451
General activities
Repair, maintenance and diagnosis activities on
vehicles with high-voltage system may only be
performed by qualified staff (the minimum qualifi-
cation required is high-voltage awareness
training).
Deenergization of the high-voltage system before
operations are carried out on the vehicle and
subsequent initial startup after the operations
have been performed may only be carried out by
one and the same electrical specialist for high-
voltage systems in motor vehicles (series
production vehicles). The following preconditions
must be met:
• Successful completion of the high-voltage
awareness course
• Successful completion of the high-voltage
qualification course
• Successful completion of the smart electric
drive product training course
Working requirements
When work is performed on a high-voltage system,
the system must be deenergized and the voltage-
free state of the high-voltage system must be
secured.
This has to happen in accordance with 5 safety
rules as per DIN VDE 0105:
• Deenergize
• Secure against reactivation
• Check deenergisation at all terminals
• Ground and short circuit
• Cover or shield any adjacent current-
conducting parts
The following information must be observed and
complied with for operations on high-voltage
systems:
• Testing equipment and aids must be checked
for proper condition before use
• Cable lugs and contacts must be secured with
suitable protective bags and insulating caps
• Contacts, electrical lines and electrical
connectors must be checked for dirt and
damage before assembly and they must be
cleaned or replaced if necessary
• Screw contacts must be tightened to the
specified tightening torque and (if applicable)
rotation angle
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