Modes Of Operation; Load On Bypass; Figure 41 Load On Bypass (Ups Not Available); Table 7 Circuit Breaker Abbreviations - Liebert 610 Series Operation & Maintenance Manual

3.3

Modes of Operation

This section illustrates the flow of power through circuit breakers, switches and UPS components dur-
ing various modes of operation. The same modes of operation apply to all configurations of the Liebert
Series 610 UPS. Highlighted (thick) lines in the diagrams indicate power flow and power availability.
These illustrations show a three-breaker maintenance bypass because it is commonly used. Your
installation may have a two-breaker, three-breaker or four-breaker maintenance bypass or none at all.
These illustrations do not show an alternate power source (generator) and automatic transfer switch
(external to the UPS) that might be present at your installation.
Table 7 below lists abbreviations for circuit breakers used in this manual.
Table 7 Circuit breaker abbreviations
Abbreviation
BFB
BIB
MBB
MBD
MIB
RIB
3.3.1

Load on Bypass

Load on Bypass, with the UPS not available, is shown in Figure 41. The UPS system could be in this
mode of operation during either initial start-up or UPS system shutdown and isolation for maintenance.
NOTE
When the critical load is being supplied power from the bypass line, it is exposed to utility
power disturbances.

Figure 41 Load on bypass (UPS not available)

BFB
RIB
MAIN INPUT
SWITCHGEAR
Circuit Breaker
Bypass Feeder Breaker
Bypass Input Breaker
Maintenance Bypass Breaker
Module Battery Disconnect
Maintenance Isolation Breaker
Rectifier Input Breaker
THREE BREAKER MAINTENANCE BYPASS SWITCHBOARD
BIB
CONTROL POWER
INPUT
CB
MBB
UPS MODULE
Static
Bypass
Switch
Static
Switch
Bypass CB
Disconnects
Controls
Rectifier/
Inverter
Charger
OUTPUT
CB
Battery
MBD
58
Operation
Critical
Load
AC Output
MIB