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6 Functions and Signals
Beep Codes
The following table contains common UPS statuses with their beep codes.
UPS System Block Diagram
Figure 5.1 illustrates the True On-Line Double Conversion architecture of the UPS system. The
major modules consist of:
1) AC-to-DC power converter (rectifier) with PFC control circuit
2) DC-to-AC high frequency inverter
3) Smart battery charger
4) Bank of stationary, maintenance-free batteries
5) DC-to-DC push/pull converter control circuit
6) Static bypass loop
7) Input and output EMI filters
UPS Status
Beep Code
UPS faulty, Inverter shut down. All functions inhibited.
Long Continuous Beep
Control keypad error
Long Continuous Beep
UPS faulty, loads continue to be supplied via Inverter or Bypass. Single beep every two seconds
In battery mode
Single beep once per second
Battery low
Quick and short successive beeps
Confirm RS-232 port receiving
Two quick and short beeps
Service mode okay
One quick and short beep
Figure 5.1
