UPS Power Supplies & Systems UK

1
How a Control System Works within an Automatic
Transfer Switch
Ordinarily, normal power is provided by a utility
company and connected to onsite applications.
When the primary power source has ceased to work,
power from a new or used generator can be either
manually or automatically transferred to the
onsite application via a transfer switch.
2
Frequency and Voltage Sensing
One of the main functions of the control panel is
the detection of a drop in voltage or a complete
failure of the normal source of power. In
general, all phases are monitored. Failure points
are defined as a drop in voltage below a preset
setting on any phase. Voltage and frequency
information is provided by the sensors in the
control panel to determine load availability. The
minimal voltage and frequency must be attained
before transfer of the load to the new or used
generator. This is to ensure the generator set
has the ability to accept the load.
Engine Control Contact Point
The controls will include a contact point that
signals then engine controls to start when normal
power from the grid fails. In most modern designs
this contact is usually a dry contact which
closes upon failure of normal power. When the
contact closes it completes the circuit from the
cranking batteries to the engine start control
systems. Conversely, this contact point opens to
shut down the new or used generator
3
Automatic Transfer Switch
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