Operating Modes; Normal Operation; Battery Operation; Bypass Operation - Gamatronic POWER+ User Manual

2. O
PERATING MODES
The POWER + UPS functions to supply ac electrical power to your load.
While using the POWER + , 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, an additional mode can
only be invoked via manual intervention—by either the user or a technician:
•
Emergency Power Off (EPO)
Details of this mode of operation are described in section 2.3.1 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.
When two or more POWER + units are deployed in a parallel configuration, one (or more) unit(s) may
operate in normal mode while (one or more of) the remaining unit(s) operate(s) in battery mode.
2.3 Bypass operation
During bypass operation, the load receives power directly from the ac input via the static switch.
Whenever the inverters cannot provide power to the load for any reason (such as an overload or a short-
circuit in the load), transfer to the bypass ac input is automatic. As soon as the problem is corrected, the
load is transferred back to the inverter.
When two or more POWER + units are deployed in a parallel configuration, bypass mode is always
activated simultaneously in all of the units.
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AMATRONIC LECTRONIC NDUSTRIES
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