1100A SERIES UPS
OWNERS / TECHNICAL MANUAL
Page Number:
1-11
MITSUBISHI ELECTRIC 1100 SERIES UPS
B) Bypass Operation:
Load power supplied through UPS internal static bypass line.
Figure 1.2
Single Line Diagram - Bypass Operation: Load fed through static bypass line.
Referring to Figure 1.2: The Internal bypass line is a hard-wired line through 52S which
supplies the critical load with unconditioned bypass input power. Upon switching to the
internal bypass line, the static transfer switch line through CB3 (herein after STS contactor
CB3) supplies the power immediately, and then the internal bypass line through 52S
supplies the power. In the event of a switching to the bypass line, the power to the critical
load will be uninterrupted. The purpose of this internal bypass line is to route power to the
critical load while the UPS module is de-energized (converter and inverter), and during
start-up before the system is fully operational.
In the event of a load overcurrent, the UPS transfers to bypass without interruption to the
critical load.
The internal control system determines the operation of the two paths, with the load
powered from the inverter being the normal operation.
UPS Module
Power Flow
AC
input
CB3
CONVERTER /
CHARGER
Output
52C
Static Transfer
Switch
52S
72B
MCCB
User
supplied
CB
52RC
Not in Use
BATTERY
Built-in or external Battery
INVERTER
