liebert Precision Power Center TECHNICAL DATA MANUAL
POWER CONVERSION/DISTRIBUTION
Precision Power Center
TECHNICAL DATA MANUAL
Three Phase
15-225 kVA
50 & 60 Hz
Table of Contents
NO-COMPROMISE POWER DISTRIBUTION AT LOWER INSTALLED COST . . . . . . . . . . . . . . . . . . . . . .1
LIEBERT PACKAGED POWER SYSTEM ADVANTAGES COMPARED TO CONVENTIONAL,
BUILT-UP SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
CAPACITIES AND CONFIGURATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
STANDARD FEATURES FOR ALL SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Panelboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ADDITIONAL FEATURES FOR ALL SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
HARMONICS SOLUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
SYSTEM MONITORING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Power Monitor Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Remote Monitoring Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PHYSICAL/ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
HEAT OUTPUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
SYSTEM SIZING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
SERVICE ACCESS AND CLEARANCE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figures
Figure 1 Conventional built-up system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2 Liebert Precision Power Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 3 Liebert Precision Power Center—Top Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 4 Precision Power Center, 1-4 panelboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 5 Top Exit Precision Power Center, 1-2 panelboards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 6 Precision Power Center diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 7 Dimensions, clearances, 1 panelboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8 Dimensions, clearances, 2 panelboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 9 Dimensions, clearances, 3 panelboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 10 Dimensions, clearances, 4 panelboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11 Dimensions, clearances, Top Exit unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table s
Table 1 Features available by model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2 Electrical and mechanical characteristics, 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3 Electrical and mechanical characteristics, 50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4 Electrical and mechanical characteristics, Top Exit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 5 Heat output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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No-Compromise Power Distribution at Lower Installed Cost
NO-COMPROMISE POWER DISTRIBUTION AT LOWER INSTALLED COST
Liebert Precision Power Centers offer distribution, computer-grade grounding, and monitoring. Unlike conventional built-up systems, these Liebert packaged power systems provide easy low-cost installation, simple
relocation, security, proven design and performance, electrical isolation, and effective noise suppression.
Figure 1 Conventional built-up system
Power Panels with Rigid
Conduit Distribution
Input
Circuit
Breaker
Output
Circuit
Breaker
4-wire
208/120V
Isolation Transformer
REPO
Figure 2 Liebert Precision Power Center
Power Panels with Flexible
Interconnecting Cables
Circuit
Breaker
Power J-Box
Figure 3 Liebert Precision Power Center—Top Exit
Top Exit Precision
Power Center
REPO
Control
J-Box
REPO
Circuit
Breaker
1
Liebert Packaged Power System Advantages Compared to Conventional, Built-Up Systems
LIEBERT PACKAGED POWER SYSTEM ADVANTAGES COMPARED TO CONVENTIONAL,
UILT-UP SYSTEMS
B
Desirable Features Conventional Built-Up Systems Liebert Packaged Power System
Proven System
Design
Agency Approved
Factory Tested
Power Quality
Improvement
Computer-Grade
Grounding
Secure Distribution
Circuit Identification
Monitoring
Ease of Installation
Easy System
Expansion
Easy System
Rearrangement
Easy To Move
No. Each site is a one-of-a-kind installation.
“Design” depends on engineer and installer.
Not as a system. Even though listed
components may be used, site-fabricated
distribution is subject to acceptance by local
inspecting authorities.
No. Testing of performance is done at the site,
if at all.
Doubtful. Because of the variables in design
and installation, site-fabricated distribution
does not consistently offer computer-grade
power isolation or ground systems.
Difficult. Since site-fabricated distribution
seldom includes an isolation transformer in the
computer room, a local single point ground
system that minimizes common mode
disturbances is difficult to establish.
Possibly. Only if the entire distribution panel is
dedicated to the computer and the panel is in
the computer room.
Possibly. Circuit number and receptacle
references might be supplied, depending on
the installing electrician and available
information.
Seldom. Some add-on monitoring systems are
available, but monitoring also depends on the
installing electrician and available information.
No. All site-fabricated distribution wiring
becomes part of premises wiring.
No. Conduit installation and wire pulling is timeconsuming, and can hamper operations while
in progress.
No. Site-fabricated distribution cannot be easily
rearranged. Old conduit and wiring must be
removed and new installed.
No. New distribution must be built at the new
site and old conduit and wiring usually must be
removed from the former site.
Yes. Liebert power systems are complete,
proven-design, factory tested to ensure
consistent performance. Designed-in
distribution flexibility accommodates all
installation sites.
Yes. UL listing as a complete system is an
assurance of safety.
Yes. Factory testing the complete system
ensures performance and safety of the system.
Yes. Because packaged power systems have
shielded isolation transformers close to the
load, they offer power line noise attenuation
and controlled grounding.
Yes. The packaged power system with
isolation transformer automatically establishes
a local single-point ground for the critical load.
The power grounding point is the same as the
computer system grounding point, minimizing
common mode disturbances.
Yes. Power distribution panel is in the
computer room. Access is limited to authorized
personnel.
Yes. Identification tags adjacent to each circuit
breaker provide circuit identification and
description of load served. Each cable is
tagged with circuit number and cable length.
Yes. Built-in power parameter monitoring,
alarm, and control capabilities are standard in
packaged power systems.
Yes. A packaged system requires only a single
connection to the premises wiring.
Yes. New cable(s) can be routed quickly with
minimal disruption.
Yes. Even after major equipment
rearrangement, redistributing power from
packaged systems becomes a simple matter of
re-routing the flexible interconnecting cables.
Yes. The package is easily moved with the
computer system to the new site.
2
Capacities and Configurations
CAPACITIES AND CONFIGURATIONS
Liebert packaged power systems provide isolation, monitoring control, conditioning, and local single-point
ground to ensure computer-grade power.
With sizes ranging from 15 kVA to 225 kVA in a wide variety of configurations, the Liebert packaged distribution and conditioning systems can meet the requirements of almost any application.
Figure 4 Precision Power Center, 1-4 panelboards
15-30 kVA, 1 panelboard 50-225 kVA, 4 panelboards
50-225 kVA, 3 panelboards 50-125 kVA, 2 panelboards
3
Figure 5 Top Exit Precision Power Center, 1-2 panelboards
Capacities and Configurations
15-30 kVA, 1 panelboard
Figure 6 Precision Power Center diagram
Shielded
Isolation
Transformer
High
Vol tag e
J-Box
Arrester
Low
Vol tag e
J-Box
Input
Circuit
Breaker
Surge
Monitoring
Control
Remote
Monitoring
System
Single Point
Ground
and
Spike
Suppression
Module
Display
50-225 kVA, 2 panelboards
Main
Circuit
Breaker
Main
Circuit
Breaker
Subfeed
Output
Breaker
Local
Output
Panelboard
Output
Panelboard
4
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