Thomas & Betts 9395 - Manual (Page 65)

UPS 225 - 275 kVA
User’s and Installation Guide
1027212
Revision B 5
6 Responding to system events
6.1 General
When the UPS system is running in Normal mode, it continually monitors itself and the
incoming utility power. In Battery or Bypass modes, the UPS may issue alarms to let you know
exactly what event caused the change from Normal mode. System events on the UPS can be
indicated by horns, lights, messages, or all three. Select Events from the menu bar on the Main
Menu screen to look at the Active System Events screen. This screen shows any currently active
alarms, notices, or commands. For more information on using the Events screen, see paragraph
5.2.5, “Display menu operation” on page 51.
6.2 System event horns
The system event horn beeps to alert an operator that an event needing attention is taking
place. Horn 1 cycles at a one-second rate.
6.3 System event indicators
The status indicators on the UPS control panel and the event horn let you know when the UPS
system is operating in any mode other than Normal. Only the Normal indicator is visible during
normal UPS system operation. The other indicators illuminate to indicate alarms or events.
When an alarm occurs, first check these indicators to see what type of event has taken place.
For descriptions of the status indicators, see paragraph 5.2.1, “Status indicators” on page 49.
6.4 System event messages
When a system event occurs, a message appears on the LCD in the UPS status area. This
message is also written to the Active Events log and may be added to the Events History log.
The messages are divided into four categories: alarms, notices, status, and commands.
The top line of the LCD scrolls all active notices and alarms. The top line of display blinks while
scrolling when the system needs attention. Some notices and alarms may be accompanied by
an audible horn. To silence the horn, press any control panel pushbutton once.