Electrical Installation: Checklist - Siemens SINAMICS S120 Manual

Electrical installation

4.2 Electrical installation: Checklist

4.2 Electrical installation: Checklist
Important safety precautions
Hazardous electrical voltage
The cabinet units are operated with high voltages.
All connection work must be carried out when the cabinet is de-energized.
All work on the unit must be carried out by trained personnel only.
Work on an open unit must be carried out with extreme caution because external supply
voltages may be present. The power and control terminals may be live even when the
motor is not running.
Dangerously high voltage levels are still present in the unit up to 5 minutes after it has been
disconnected due to the DC link capacitors. For this reason, the unit should not be opened
until a reasonable period of time has elapsed.
The user is responsible for ensuring that the motor, cabinet units, and other components
are installed and connected in accordance with the recognized technical rules in the
country of installation and with other applicable regional regulations. Special attention
should be paid to cable dimensioning, fuses, grounding, shutdown, disconnection, and
overcurrent protection.
If an item of protective gear trips in a branch circuit, a leakage current may have been
disconnected. To reduce the risk of fire or an electric shock, the current-carrying parts and
other components in the cabinet should be inspected and damaged parts replaced. When
an item of protective gear trips, the cause of the trip must be identified and rectified.
NOTICE
Forming the DC link capacitors
The cabinet unit should not be stored for more than two years. If the device is stored for
more than two years, its DC link capacitors must be reformed during commissioning. The
reforming procedure is described in this Manual in the chapter titled "Maintenance and
servicing", section "Reforming the DC link capacitors".
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DANGER
Cabinet Modules
Manual, 03/2013, A5E03263538A