Maintenance Bypass Cabinet; Bypass Switch; Normal (Ups) Mode; Figure 17 Single Ups With External Maintenance Bypass Cabinet-Typical Configuration - Emerson Liebert NX 10-30kVA Installation Manual

4.0 M
AINTENANCE
The Maintenance Bypass Cabinet is designed to operate in UPS mode, bypass mode and maintenance
mode. The mode is selected using the Bypass Switch.
Figure 17 Single UPS with external Maintenance Bypass Cabinet—typical configuration
4.1

Bypass Switch

The Bypass Switch allows easy and rapid transfer of connected loads between the UPS and Bypass
source.
4.2

Normal (UPS) Mode

While the Maintenance Bypass Cabinet rotary switch is in the NORMAL position, the UPS is supply-
ing the connected load with continuous, high-quality AC power. In this mode of operation, the load is
protected by the UPS.
B C
YPASS ABINET
N
Input Mains
Supply A B C
CB 1
UPS 1
Rectifier
CB 1
Static
Switch
Fuse
Inverter
Battery 1
SW1-A
Ext Byp
A B C
Y
Input Supply
N
Sys In CB1
Qin UPS
SW1-C
Rotary
Switch
SW
SW1-D
N
QoutUPS
Sys Out CB2
N
25

Maintenance Bypass Cabinet

A B C
Ext Byp
To Load