Figure 1.2 Single Line Diagram - Bypass Operation: Load Fed Through Static Bypass Line - Mitsubishi Electric 1100A Series Owner Technical Manual

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.

CB
AC
input
User
supplied
MCCB
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.
1100A SERIES UPS
OWNERS / TECHNICAL MANUAL
UPS Module
CONVERTER /
CHARGER
52RC
72B
BATTERY
MITSUBISHI ELECTRIC 1100 SERIES UPS
Page Number:
52S
CB3
Static Transfer
Switch
INVERTER
52C
Power Flow
Not in Use
Built-in or external Battery
1-11
Output