Operating Instructions

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.
1
2
VFD060R1
Figure 8. Disconnecting Y Capacitor in SED2 Frame Size A.