Always
O
n UPS Systems
M0309_N_Series_ABS_700-3kVA_User_Manual V2.8 2012-06-12
1
1.
Introduction
Congratulations on your choice of the Always
“O
n N Series On-Line Uninterruptible Power
System (UPS). The N Series features the very latest, top of the line, microprocessor technology
and IGBT transistors for clean, highly regulated, PWM (Pulse Width Modulated) True Sine
Wave power.
For ease of use, the N Series utilizes an LCD display to indicate “load percentage”, “battery
capacity”, input voltage, output voltage, input frequency, output frequency, internal UPS
temperature and the mode of operation. It also provides self-diagnostics, a combination
On/Alarm Silence/Manual Battery Test button, a combination Off/Bypass button, and two
levels of alarms when the unit is operating on battery.
The N Series incorporates an interface port for communications between the UPS and a LAN
server or other computer system with various operating systems installed. This port provides
detailed operating information including voltages, currents, and alarm status to the host system
when used in conjunction with the shutdown software. Also available are the optional SNMP
Adapter to permit remote control, monitoring and notification of UPS conditions via a network
or the internet, and an AS-400 interface to allow for relay communications in PLC or contact
environments.
1.1.
Modes of Operation
The N Series UPS is designed to operate as a continuously on-line dual conversion
system in the following modes:
Normal -
The critical AC load is continuously supplied by the UPS Inverter. The
input Rectifier derives power from a utility AC source and supplies power to the
Inverter while simultaneously float-charging the storage batteries.
Back-Up -
Upon failure of utility AC power, the Inverter obtains power from the
batteries without interruption. There are no interruptions in power to the critical load
upon failure or restoration of the utility AC source.
Recharge
- Upon restoration of utility AC power after an outage, the Rectifier will
automatically restart and supply power to the inverter and battery charger.
Automatic Restart
- Upon restoration of utility AC power, after an extended outage
and complete battery discharge, the UPS will automatically restart and resume
supplying power to the critical load. Also the battery charger will automatically
recharge the batteries.
Static Bypass
- The bypass will provide an alternate path for power to the critical
load and is capable of operating in the following manner:
Automatic
- In the event of the inverter overload capacity being exceeded or
should an internal failure occur, the UPS will perform an automatic transfer of
the critical AC load from the inverter to the bypass source.
Manual
- Should the UPS need to be taken out of service for limited
maintenance or repair, manual activation of the bypass will cause an immediate
transfer of the critical AC load from the inverter to the bypass source. The input
rectifier, inverter, and battery charging operations will be inhibited until the user
transfers the UPS back to normal operation.
