Emerson NT5C06D - Manual (Page 11)

11
Helios Rectifier 25/48 NT5C06D Installation and User Manual
1. Introduction
Description
The NT5C06D Switch Mode Rectifier is rated for 25 A at -48 V DC. This
rectifier incorporates AC input power factor correction circuitry, is highly
efficient and lightweight (15 lbs.). It is fully connectorized and plugs into a
power shelf into which up to three rectifiers can be installed. The rectifier is
forced air cooled with air entering from the front and exhausting out the rear
of the power shelf.
Separate or common AC power feeds are connected to the power shelf to
provide power to each rectifier through the back plane connectors. The
rectifier requires a single phase AC source at a nominal voltage of 208/240 V
AC, 50 or 60 Hz. The AC power can be supplied from a single phase source
or a three-phase system connected phase to phase. The rectifier can also be
powered from a 380 V AC WYE system connected phase to neutral (that is,
220 V phase-neutral).
The negative and positive outputs of each rectifier are connected to two
common busses (BAT -48 and BAT RTN +). The power shelf is designed
for a typical capacity of 75 A. The design of the rectifiers allows rectifiers
located in the same power shelf, or other shelves, which are connected in
parallel, to share the load, either by forced load share or by an output
negative slope method.
The back plane of the power shelf is equipped with two types of signal
connectors. One is an eight-pin (male) connector that provides the interface
to analog type controllers. The other connector is a twenty-six-pin flat cable
(female) type connector compatible with the Helios system family and
provides a larger diagnostic capability.
Each rectifier provides a variety of monitoring and alarm features such as,
rectifier failure alarm, fan fail alarm, ac fail alarm, remote sensing, sense fail
alarm, local and remote high voltage shutdown, automatic high voltage
shutdown reset, temporary release, remote and local equalize, and remote
shunt monitoring.