Mitsubishi Electric 1100B Series Owner Technical Manual page 18

B) Bypass Operation: Load power supplied through UPS internal static bypass line.
Figure 2 Single Line Diagram - Bypass Operation: Load Fed Through Static Bypass Line
CB
Bypass
input
User
supplied
MCCB
CB
AC
input
User
supplied
MCCB
Referring to Figure 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 (STS) line through CB3 supplies the power immediately. 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 (converter and inverter) is de-energized,
and during startup before the system is operating on the UPS module.
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.
1100B SERIES UPS
OWNERS / TECHNICAL MANUAL
UPS Module
CONVERTER /
CHARGER
52RC
BATTERY
MITSUBISHI ELECTRIC 1100B SERIES UPS
52S
CB 3
Static Transfer
Switch
INVERTER
52 C
72B
External Battery
Page Number:
1-12
Output
Power Flow
Not in Use