Page 4 of 26 Rev. A
1 I ntroduction
EP series is a line interactive power system that has a step wave output. It prevents impulse,
surge, sag and power outage situations. It provides the UPS output load with a reliable
source. It has the following functions:
1.1 Boost:
If the utility voltage drops to line boost activated point*, the AVR will be activated
and increase the input voltage by 1.18 times of incoming utility voltage.
*Boost activated point
110 VAC 120 VAC 220 VAC 230 VAC 240 VAC
99 VAC 108 VAC 198 VAC 207 VAC 216 VAC
1.2 Buck:
If the utility voltage reaches to line buck activated point, the AVR will be activated
and decrease the input voltage by 0.85 times of incoming utility voltage.
*Buck activated point
110 VAC 120 VAC 220 VAC 230 VAC 240 VAC
121 VAC 132VAC 242 VAC 253 VAC 264VAC
1.3 50/ 60Hz Automatic Frequency Selection:
The output frequency will automatically match the input frequency (50 or 60Hz).
1.4 Communication Port (USB):
It provides remote shutdown capability via communication port for connected
computers.
1.5 Data line/ telephone line protection:
The unit provides RJ11 port to provide transient voltage surge suppression
(TVSS) for data line or telephone line.
1.6 Cold start (DC start):
The UPS is equipped with DC start function to turn on the UPS without input source.
1.7 Green Power Function:
When the load can hardly be detected in battery mode, the UPS will shut down for
energy saving.
This manual contains block diagram, principle of operation, system outline and
troubleshooting.
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