Theory of Operation
10
Sinergy S II Series Series UPS User Instruction Manual
5. Connect the battery counter cable between the UPS and the battery cabinet closest to UPS.
6. Set the circuit breakers on each battery cabinet to “ON” position.
Fig. 8: Battery Circuit Breaker
Power Connections
After all external batteries are connected, make the necessary input and output power connections by
following the steps below.
1. Connect the input power cord to the AC outlet
NOTE:
The batteries will immediately begin charging upon availability of input power.
2. Connect the load to the UPS.
It is suggested that the highest priority equipment be attached to the main outlets and that lower
priority loads be attached to the two programmable outlets.
NOTE:
With the use of MopUPS
®
software or the ManageUPS
®
network adaptor, the programmable
outlets can be set to have a delayed start-up or a pre-scheduled shut-down during battery operation in
order to conserve battery power for the highest priority loads.
3. If using a UPS with IEC receptacles and inlets, cords may be secured by using the cord retainer and
supplied tie wraps, see Figure 7.
4. After all connections are made, follow the instructions in the section titled “UPS Start-up &
Shutdown” on page 15 to start your UPS and external battery.
Theory of
Operation
ATTENTION:
This UPS is supplied with standard power cords and receptacles suitable for its use in
your area of operation. It may be installed and operated by non-technical personnel.
UPS Mode
In use, the UPS is connected between AC input power and the load. The operation of this UPS is based
on the on-line principle in which the input AC power is first converted to DC, and secondarily converted
back to a sine wave of a fixed frequency and voltage to supply controlled power to the load. This UPS
topology is used to isolate the critical load (e.g. servers, switches, routers, etc.) from a variety of power
line problems, including the total loss of input AC power.
Battery Mode
In the event of a mains failure, the maintenance-free batteries will continue to provide an uninterrupted
supply of energy to the load. In practice, most mains failures are of relatively short duration. Therefore,
the energy stored in the UPS’s batteries is, in most cases, sufficient to ensure continuous operation of the
connected systems until the mains power is reestablished. In the event of a long lasting mains failure, the
UPS can be utilized with shutdown software to enable a controlled shutdown of connected systems.
The most reliable method for determining the estimated battery runtime is the application of MopUPS
software or a ManageUPS network card. With this software, the estimated remaining battery capacity is
indicated before and during an AC power failure. These products also allow for automated shutdown
procedures that can shut down the attached devices after safely closing open application programs and the
operating system. After return of the mains voltage, the UPS automatically restores power to the
connected equipment.
Circuit Breaker
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