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UPS Controls
The UPS has three primary control areas as described in the following paragraphs.
Control Panel
The Control Panel on the front of the UPS (see Figure 22) contains the operator
controls to start and stop the UPS and change the operating mode. The Control
Panel is described in Using the Operating Controls section of Chapter 10.
Monitor Panel
The Monitor Panel on the front of the UPS (see Figure 22) contains an LCD screen
to display the current status of the UPS. You can view a statistical history and log
of UPS events and display a real-time graphic representation of power flowing
through the UPS components. Backlit status indicators show the operating mode
of the UPS and alert you to system events.
Maintenance Bypass
Maintenance Bypass (MBP) Circuit Breaker
This breaker is normally open. When closed, it feeds utility power to the critical load
when the MIS breaker is opened.
Maintenance Isolation (MIS) Circuit Breaker
This circuit breaker is normally closed, feeding UPS power to the critical load. This
breaker is opened to isolate the UPS after the MBP breaker is closed.
Maintenance Bypass (MBP) Circuit Breaker
This circuit breaker is normally closed feeding bypass power to the UPS internal
bypass circuit. This breaker is opened to isolate the UPS bypass after the load is
transferred to maintenance bypass.
UPS Standard Features
The UPS has many standard features that provide cost-effective and consistently
reliable power protection:
Communication Panel
Computer Interface
One combination RS---232/RS---485 serial communication port is standard on all units,
and is electrically isolated from the UPS. An additional RS---232 serial communication
port is available (as an option), and is also electrically isolated from the UPS.
Summary Alarm Contacts
Alarm contacts are provided for connection to equipment at your facility, such as a
light, an audible alarm, or a computer terminal. The equipment you connect to these
contacts alerts you to a UPS alarm.
Input Filter
Your unit may be equipped with an input filter. An input filter yields power factor
correction that allows you to save on your initial installation and operating costs.
The filter also reduces input harmonic current distortion and minimizes upstream
interference that can damage sensitive hardware components.
Powerware BPIII Harsh Environment UPS 50--75 kVA Installation and Operatio
164201261 Rev. F 111503
Controls and Features
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