Toshiba T90S3S08KS6XSN, Manual

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G9000 Installation and Operation Manual 9
In the event of a UPS module failure during Parallel Operation, the critical load power will be
continually supplied and shared by all other UPS.
The Bypass Input breaker and cables are to be supplied and installed by the user or
the constructor. (See WARNING 4 on page 1-4)
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.
Figure 1.2 shows 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.
Each UPS internal static bypass line will equally share the power supplied to the critical load
whenever the system is in the Parallel Operation.
UPS Module
Power Flow
Not in Use
AC input
CB
CB3
CONVERTER
/ CHARGER
INVERTER
Output
52C
CB1
External
BATTERY
User supplied
MCCB
Static Transfer
Switch
52S
CB2
Battery Cabinet
Bypass
input
CB
User supplied
MCCB
!
NOTE