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EMERGENCY POWER OFF (EPO) FUNCTION
Connect one end of a two (2) wire cable to the EPO port on the rear panel of
the UPS and the other end of the two (2) wire cable to an EPO switch. To
shutdown the UPS in the AC or the Battery mode short pin1 to pin2 for ap-
proximately 0.5-seconds. In the AC mode; the UPS must be turned off and
then back on again to restart the UPS. In the Battery mode; once the utility
power returns the UPS must be turned on to restart the UPS. The LCD will
display EPo for this function.
Chapter 4: Operation
The UPS will charge the batteries when the UPS is in the on or off position as
long as the UPS is plugged into the wall outlet and there is an acceptable AC
voltage present (55V (load dependent) - 150VAC). When a blackout, brown-
out, or an overvoltage condition occurs while the UPS is in the On-Line mode
or the Economy mode; the UPS will transfer to the battery mode, the On-
Battery indicator will illuminate and the audible alarm will sound once every
ten-seconds indicating that the utility power is lost or unacceptable. When the
utility power returns or is at an acceptable level, the UPS will automatically
transfer back to the On-Line mode or the Economy mode and start recharging
the batteries. During an extended outage when there is approximately two-
minutes of backup time remaining the audible alarm will sound twice every
five-seconds. This Low Battery Warning is letting the user know that they
should save all open files and turn off their equipment. When the batteries
reach the predetermined level the UPS will automatically shutdown protecting
the batteries from over discharging. Once the utility power returns the UPS
will automatically restart providing safe usable power to the connected equip-
ment and start recharging the batteries.
The Economy mode operation: The input utility power 'bypasses' the inverter
circuit and is connected directly to the output of the UPS powering the con-
nected equipment while simultaneously charging the batteries. When a black-
out, brownout, or an overvoltage condition occurs the UPS will transfer to the
battery mode, the inverter will turn on powering the connected equipment, the
On-Battery indicator will illuminate and the audible alarm will sound once every
ten-seconds indicating that the utility power is lost or unacceptable. When the
utility power returns or is at an acceptable level, the UPS will automatically
transfer back to the Economy mode and start recharging the batteries.
COMMUNICATIONS PORT CONNECTION
(OPTIONAL)
The Power Monitoring Software and interface cables can be used with the
UPS. Use only the interface cables that come with these UPSs. Connect the
interface cable (Serial or USB) to the appropriate communications port on the
rear panel of the UPS. Connect the other end of the cable to the device that
will be monitoring/controlling the UPS.
NOTE:
Connecting to the Communi-
cations Port is optional. The UPS works properly without this connection.
OPTION SLOT
(OPTIONAL)
The option slot on the rear panel of the UPS is for the SNMP and the Relay
cards. Remove the cover plates from the option slot. Install the SNMP card or
the Relay card. Connect the appropriate interface cable to the SNMP card or
the Relay card on the rear panel of the UPS. Connect the other end of the
cable to the device that will be monitoring/controlling the UPS.
NOTE:
Using
the Option Slot optional. The UPS works properly without this connection.
SYSTEM OVERVIEW
This double conversion On-Line UPS protects computers, servers, telecom-
munications, security and other electronic equipment from blackouts, brown-
outs, overvoltages, and surges. This On-Line UPS converts the input AC to
DC and then back to a true sine wave AC output. The true sine wave output is
regulated within 2% of the nominal output voltage. The Power Factor Correc-
tion (PFC) circuitry corrects the input power factor to within 99% of unity and
blocks the load generated harmonic distortion from getting back on the input
AC line. This On-Line UPS provides a continuous true sine wave output with
zero transfer time and great regulation to protect your mission critical equip-
ment. The UPS will quietly and confidently protect your system from power
anomalies.
Block Diagram of the Basic Wiring and Internal Circuit Configuration
