Standby Mode Operation: Load Power Supplied Through The Ests. (Option); Figure 3-4 Single Line Diagram - Standby Mode Operation: Load Fed Through Ests - Toshiba G9000 SERIES Installation And Operation Manual

When power is restored after a low battery shutdown, the UPS converter(s) automatically restarts
operation, the charger(s) recharges the batteries and the Inverter(s) is automatically restarted without
operator intervention. Load is automatically assumed by the inverter without operator intervention.
The power drawn by the load is equally shared between all UPS regardless of the presence or absence of
the UPS that is (are) in battery operation or not whenever the system is in the Parallel Operation.
3.2.4

STANDBY mode Operation: Load Power supplied through the ESTS. (option)

CB
Bypass
input
User
supplied
CB
AC input
User
supplied
Figure 3-4 Single Line Diagram – STANDBY mode Operation: Load fed through ESTS
Figure 3-4 shows that the ESTS consists of thyristors with the ratings enough to continuously supply a power
to the load, a driver board, an interface board, a snubber circuit, and current transfers. The critical load is
supplied directly by the mains, through the ESTS. This operation enables the UPS to reach an efficiency up to
99%. When the mains voltage gets abnormal, the supply pass to the load will be instantly switched to the
inverter within < 4ms.
!
STANDBY mode Operation is effective ONLY in SMS (Single Module Systems) with
the same power source for Bypass and AC input.
NOTE
G9000 Enhanced Series UPS Installation and Operation Manual – 93823-004
UPS Module
CONVERTER
/ CHARGER
CB1
Battery Cabinet
CB2
External
BATTERY
* (s) : In the case of the Parallel Operation
52S
CB3
Static Transfer
Switch
ESTS
Option
INVERTER
52C
Power Flow
Not in Use
Output
11