Rockwell Automation 1608P-200A480V... HC-DySC User Manual - Manual (Page 19)

Rockwell Automation Publication 1608P-UM005A-EN-P - November 2014 19
Applying Power and Operation Chapter 4
HC-DySC Operation The HC-DySC section contains three power electronics modules (one module
per phase) and controls that continuously monitor the line voltage. The modules
are series-connected to the input line, and operate by adding the compensating
voltage needed to restore the line to its nominal output. When the utility line
voltage is within normal range the ac static switch components remain closed and
no compensating voltage is added. When an insufficient line voltage event
occurs, the static switches open and the sag-correcting electronics quickly add the
balance of voltage necessary to regulate the load voltage.
The HC-DySC accepts line input power over 3 wires into terminals L1, L2, L3
and provides sag compensated three-phase output power at terminals X1, X2,
and X3 when not in the Maintenance Bypass mode. In 4-wire systems the input
Neutral is connected directly to the output Neutral terminal.
A touchscreen display provides indication of the status of the HC-DySC
operation. After power is switched on, the green "OK" box will be displayed in
the upper left hand corner of the display, indicating that the output voltage is
within a normal range of -13% to +10% of nominal.
A red "FAULT" box is displayed in the upper left hand corner of the display when
a fault condition is present on the HC-DySC. During this period sag correction
is disabled and the HC-DySC will continue to bypass the utility voltage directly
to the load through the static bypass path. An orange "FAULT OVER" box is
displayed when the previous fault condition has cleared. Sag correction will
remain inhibited until the reset period has expired (approximately 1 minute). A
blue "SYSTEM OFFLINE" box is displayed whenever the HC-DySC system is
in the maintenance bypass mode (CBB closed and CBI open).