Master Switch Three Phase
Installing a Master Switch static transfer switch
provides additional resilience and protection from
the disruption that can be caused by the failure of
a single power source.
The result is the absolute protection of industrial
utilities and critical information technology against
power supply and load faults.
Operating principle
Master Switch guarantees a source of redundant
power, allowing the load to be switched between
to alternative and independent power sources.
Switching can be automatic (when a supply
source falls outside of acceptable tolerances) or
manually done by an operator from the front panel
or remotely.
Protection against power supply faults
If one of the two power sources falls outside
tolerance levels, Master Switch will transfer the
consumers to the second power source (switching
is instantaneous if the two sources are in phase).
Protection against environmental disturbances
Overloads and load faults
In the event of an overload, the user can decide
the level of intervention of the internal protection
devices in order to block the power supply. In the
extreme case of a downstream short circuit,
Master Switch disconnects the load in order to
avoid jeopardising the operation of the other loads
(i.e. in the event of poor selectivity of the
protection devices).
Total microprocessor control
Microprocessor control logic ensures:
- Fast and safe switching between power sources
- Monitoring of all parameters via LCD display
- Constant monitoring of SCR operation
- Advanced remote diagnostics (RS232 and TCP /IP).
Redundant design
Power is supplied to the internal logic by two
physically separate supply circuits that are fully
independent and that can be replaced in “hot
replacement” mode without causing power
supply interruptions to the load. In the event that
the power supplied by both sources fails, full
system operation is guaranteed by the “Power
Supply back up” function, which provides
auxiliary power supply to the circuits from an
external, independent power source.
Master Switch is equipped with a dual redundant
ventilation system known as: “fan redundance
plus”. Thanks to this feature, and in the unlikely
event that two fans fail at the same time, those
remaining would still be able to dissipate the heat
generated at nominal load and with an ambient
temperature of up to 40° C.
Also the fans can be replaced in “hot
replacement” mode, ensuring continuity during
the replacement operation.
Superior protection
In the event of an output short circuit,
Master Switch blocks the transfer between the two
power sources, eliminating the risk of propagating
the short circuit and its effects to the other loads.
A back feed control circuit ensures the automatic
intervention of the protection devices when a
return of power to one of the two Master Switch
inputs is detected.
Accessibility
The layout of the moving components and parts is
designed to ensure easy frontal access:
- power cable connections that are easily accessed with entry from below
- boards housed in a dedicated area for rapid diagnosis / replacement
- all parts subject to monitoring, maintenance and/or replacement.
Advanced communications
Master Switch provides information,
measurements, statuses, and alarms via the LCD
display.
The STS is compatible with PowerShield³
supervision and shutdown software for Windows
operating systems 8, 7, 2008, Vista, 2003, XP,
Linux, Mac OS X and Sun Solaris.