Siemens SED2 Specifications download pdf (Page 35)

Electrical Installation

Siemens Building Technologies, Inc. 25

Operation in Ungrounded Systems

IP20 and NEMA Type 1 SED2s can operate in ungrounded systems if the

Y capacitor is disconnected or removed. They remain in operation when

an input ground fault occurs. In the event of an output ground fault, the

SED2 switches off and displays fault code F0001.

NOTE: IP54, NEMA Type 12 SED2s cannot operate in ungrounded

systems.

Ungrounded Systems and Y Capacitor

In ungrounded systems, remove or disconnect the Y capacitor (and install

an output choke/load reactor) per Figures 8 through 11.

VFD060R1

Figure 8. Disconnecting Y Capacitor in SED2 Frame Size A.

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Siemens SED2 Specifications Page 35