Operating Instructions

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).