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SED2 VFD Startup, Operation, and Maintenance Manual

22 Siemens Building Technologies, Inc.

Electrical Installation

DANGER:

• To ensure safe operation of the SED2, authorized persons

must install and commission it in full compliance with the

warnings, cautions, and notes in this manual. Authorized

persons must also follow general and regional installation

and safety regulations regarding working with high voltages

as well as relevant regulations for the correct use of tools

and protective equipment.

• The SED2 must be grounded (per IEC 536, Class 1, NEC

and other relevant industry standards). Extremely

hazardous conditions may result if the SED2 is not correctly

grounded.

NOTE: IP20 and NEMA Type 1 SED2s can operate in

ungrounded systems if the Y capacitor is

disconnected or removed.

IP54, NEMA Type 12 SED2s cannot operate in

ungrounded systems. See the Operation in

Ungrounded Systems section for more details.

• The SED2 is suitable for use in a circuit capable of

delivering not more than 10,000 symmetrical amperes, for

a maximum voltage of 240/480/575V when protected by a

time delay Type J, H, or K fuse or circuit breaker.

• Always wait 5 minutes after disconnecting the SED2 from

the power source before performing any work. The DC link

capacitors of all SED2s remain charged with dangerous

voltages for 5 minutes after all power sources have been

disconnected. When working on IP20 units, note that live

parts are exposed. Do not touch these parts.

• In cases where a fault in the input or output power wiring

could cause significant equipment damage or severe

physical injury (such as potentially dangerous short

circuits), use additional external precautions to ensure safe

operation (such as independent limit switches and

mechanical interlocks).

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