Liebert 1500 - Manual (Page 9)

Introduction 3
Figure 2 Front view of a typical 6000 A Helios DC System 4000/48 power system
Cables are used for inter-cabinet connections (1500, 3000 and 6000 A systems) or connections to
the overhead busbars (6000 A system) for ease of expansion on live systems. In a 1500, 3000 or
4000 A systems, the power system battery return (BR) busbar is mounted externally from the cab-
inet to facilitate the connections of the battery return cables. In a 6000 A system, a separate BR
busbar dedicated to the battery returns for the loads is mounted externally from the overhead
busbar duct to facilitate the connections of the load battery return cables.
The Helios DC System 4000/48 provides a variety of monitoring and alarm features, such as high/
low float and high/low voltage alarm, high voltage shutdown, fuse and breaker alarm and rectifier
failure alarms.
The Helios DC System 4000/48 uses Helios Rectifiers 200I/48, Helios Rectifiers 200E/48 or Helios
Rectifiers 100/48 connected in parallel as building blocks to reach the maximum capacities. The
Helios Rectifiers 200I/48 operate from a 380 V to 415 V three phase, 50 or 60 Hz AC source. The
Helios Rectifiers 200I/48 operate from a 480 V three phase, 50 or 60 Hz AC source. The Helios
Rectifiers 100/operate from a 208 V to 240 V single phase, 50 or 60 Hz AC source.
The 1200 A rectifier cabinet accepts up to six Helios Rectifiers 200I/48 or 200E/48, while the 1000
A rectifier cabinet accepts up to 10 Helios Rectifiers 100/48.
The control and distribution cabinet and the auxiliary distribution cabinets are available with
distribution busbar risers of 2000 A or 3000 A capacity.
The cabinets are seismic qualified to zone 4 (Bellcore) when anchored to a concrete floor whose
compressive strength is at least 2.11 kg/mm 2 (3000 psi) and when equipped with a seismic kit.
The cabinets are seismic qualified to zone 2 without the seismic kit.
The cabinets are equipped with a ventilated, lockable door, a ventilated top cover and two rear
ventilated panels.
In many applications, such as with DMS, a consistent single-point ground (SPG) topology must be
maintained for all associated equipment. The Helios DC System 4000/48 complies with this
requirements for single-point grounding (the isolation kit is required).
2.2 Applications
The Helios DC System 4000/48 is designed to operate with DMS systems or any other telecommu-
nication systems whose input is nominal -48 V DC and whose current requirements do not exceed
6000 A capacity.
Aux dist. cabinets Main cabinet 1200 A rectifier cabinets