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4200FA Installation and Operation Manual 9
3 Product Description
This manual covers all current variants of the 4200FA Series 15-50 kVA UPS. All variants of each
capacity supply the same rated power and performance. The differences are listed below:
• 4200FA Base Model – Basic version of 15-50kVA sizes, mounted on two C-channel skids, no
integral maintenance bypass switch, no lockable On/Off switch, and no redundant dry contact
terminal switch, and optional internal batteries.
• 4200FA Premium Model – Base model plus casters, integral maintenance bypass switch (MBS),
lockable On/Off switch, and optional either internal batteries or transformer(s),.
• 4200FA Seismic Certified – Base model plus integral maintenance bypass switch (MBS),
lockable On/Off switch, and optional internal transformer(s). The 50kVA unit has three C-channel
skids.
Theory of Operation 3.1
An Uninterruptible Power Supply (UPS) is a system that is installed between the commercial power and
the critical load. The UPS provides steady AC output power during commercial power fluctuations and
interruptions.
During “Normal Operation” the UPS utilizes commercial AC power and removes high voltage spikes, and
transients caused by switching or faults on the utility. The result of this process is maximum power
conditioning and regulation.
If the AC power supplied to the UPS drops below a specified voltage level, the unit's batteries
automatically begin supplying power instead of receiving it. This insures that the loads connected to the
UPS continue to receive power without interruption. This power is provided for a long enough time so that
the load can be shut down in an orderly fashion. This prevents loss of data and possible damage to both
hardware and software.
When the AC input power becomes available again, the operation returns to normal and the batteries
begin to recharge for the next power interruption.
Application and Use 3.2
The TOSHIBA 4200FA On-Line, Uninterruptible Power Systems (UPS) provide continuous computer
grade isolated AC power in a compact, efficient, high performance unit. The UPS assures safe, reliable
operation of critical office equipment, ranging from personal computers to mini-computers to local area
networks (LAN).
All units feature an audible alarm that sounds if the battery voltage drops below the standard during use.
This is an additional aid to help in retaining valuable data and equipment. All units are capable of
interfacing to a computer network.
Power Backup 3.3
During an electrical power failure the UPS batteries automatically supply DC power to the inverter that
supports the load equipment, without interruption. For example, when used to support a computer, the
UPS’s back up assures additional time to complete your activity, store data and initiate an orderly
shutdown after a power failure occurs.
Power Conditioning 3.4
While commercial power is present, the UPS supplies conditioned power to the load while maintaining its
batteries in a charged condition.