Operating Instructions

SED2 VFD Operation & Maintenance Manual
12 Siemens Building Technologies, Inc.
Operation in Ungrounded Systems
IP20: SED2 drives (IP20) can operate in ungrounded systems, and remain in operation when
an input phase connects to ground. In the event of an output phase with a ground fault, the
SED2 switches off and displays fault code F0001.
NOTE: Operation in ungrounded systems is possible only using the SED2 (IP20) without
filter.
IP54: SED2 drives (IP54) cannot operate in ungrounded systems.
Ungrounded Systems and Y Capacitor
In ungrounded systems, remove or disconnect the Y capacitor (and integrate an output
choke) per Figure 3.
1
2
VFD060R1
Figure 3. Disconnecting Y Capacitor in SED2 Frame Size A.