Rockwell Automation 1608P-200A480V... HC-DySC User Manual - Manual (Page 41)

Rockwell Automation Publication 1608P-UM005A-EN-P - November 2014 41
Appendix
A
HC-DySC with Generator Transfer (GT) Option
GT Option Description HC-DySC model numbers that end with "-GT" include the generator transfer
option. The HC-DySC with Generator Transfer (GT) option is able to switch
between two modes of operation: series connected mode and shunt connected
mode. The GT model operates identically to the HC model when in the normal
series-connected mode; this mode provides excellent voltage sag correction
performance. When transferred to the shunt-connected mode the GT model can
provide regulated voltage to connected loads during brief, input voltage outages.
This includes open-circuit transfer periods typical of a back-up power system that
is connected through an Automatic Transfer Switch (ATS).
GT Option Operation A Generator Transfer Command signal from the facility is required. The HC-
DySC with Generator Transfer (GT) option is able to provide open transition
ride through protection only if these communications are properly installed.
Rockwell Automation or other qualified applications engineers, must specify the
connection requirements in consultation with the end user.
The generator transfer command signal is a dry relay contact that opens before
the facility ATS transfers the HC-DySC power source from grid power to
emergency power. The generator transfer command signal must be received by
the HC-DySC at least 1s before the ATS transfer. When the HC-DySC receives
the generator transfer command signal, it transitions from the series connection
mode to the shunt connection mode in preparation for the ATS transition.
When the HC-DySC is in the shunt connection mode, "GEN TRNS MODE"
displays in a blue bar in the upper right corner of the screen. See
Figure 31 . After
the ATS transitions back to grid power, the generator transfer command signal
can be removed and the HC-DySC will transition back to the series connection
mode.