Electrical Installation: Checklist - Siemens SINAMICS S120 Equipment Manual

Electrical installation

4.2 Electrical installation: Checklist

4.2 Electrical installation: Checklist
Important safety precautions
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 five 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.
CAUTION
Reforming the DC link capacitors:
The storage period should not exceed 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".
Checklist
Use the checklist below to guide you through the electrical installation procedure for the
cabinet. Read all the safety information in the section "Safety information" before carrying
out any work on the unit.
For wiring instructions, see the "Electrical installation" section or refer to the documents
listed in the table below.
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DANGER
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A