Gamatronic power+ sa - Operating Modes; Normal Operation; Battery Operation

GAMATRONIC ELECTRONIC INDUSTRIES LTD.
4
POWER
+
SA: 20, 30, and 40 kVA, Release 2.1
2. OPERATING MODES
The POWER+ SA UPS functions to supply ac electrical power to your load.
While using the P
OWER+ SA, three modes of operation are possible:
• Normal operation
• Battery operation
• Bypass operation
All three operation modes are encountered during normal UPS use to constantly provide
regulated voltage to the load.
In the normal operation mode, the UPS provides total power protection for the load.
In the battery operation mode, the load power is supplied by the battery.
In the bypass mode, power is transferred directly from the ac input to the load, bypassing
the inverter. In this mode, there is no protection but it is useful for short-term operation.
When power is restored, the UPS returns to normal operation.
In addition to the three operation modes that are set automatically by the UPS, two
additional modes can only be invoked via manual intervention: by either the user or a
technician:
• Maintenance bypass
• Emergency Power Off (EPO)
Details of each mode of operation are described in the sections below.
2.1 Normal operation
The UPS is almost always in normal operation mode. The load receives its power from the
inverters that supply stabilized voltage, protected from spikes and irregularities in the ac
input. The ac input system feeds the charger which supplies dc power to the inverter, while
concurrently charging the batteries.
2.2 Battery operation
During battery operation, the load continues to receive power from the inverters, but the dc
input to the inverter is taken from the batteries, instead of from the rectifier.
The batteries are galvanically connected by dc link to the inverter and the charger. The dc
inherently remains constant when the ac input supply drops out, without any switching
devices.
The duration of the battery operation is determined by the load demand and the battery
capacity.