- 18 -
After the UPS is repaired, start the UPS following the startup procedure, then turn
manual bypass switch to position AUTO (A). The UPS will switch back to normal operation
mode within 20 seconds.
For NBP-0811, NBP-1011 which have manual bypass circuit breaker (option), when
UPS is malfunction, please turn on manual bypass circuit breaker. The UPS changes to
operate in bypass mode. INVERTER LED is off while MAINTENANCE BYPASS LED and
alarm sound is on. All loads which connected to UPS OUTPUT are switched to connect to
utility power for temporary use. Then press POWER switch at the front to shutdown the
UPS, turn off INPUT circuit breaker and contact us or nearest service center.
After the UPS is repaired, start the UPS following the startup procedure, then turn off manual
bypass circuit breaker. The UPS will switch back to normal operation mode within 20 seconds.
5.6 LAN Interface (I/F) or RS232-PC
To communicate with computer or network, user is allowed to connect the
signal from DB9 connector to your computer to get the status as below,
5.6.1 POWER FAILURE shows utility power fails.
5.6.2 LOW BATTERY shows batteries are going to run out of power.
5.6.3 SHUTDOWN UPS When utility power fails and UPS is going to run out of
battery, computers and network are automatically save files or data. Then send
signal to UPS to shutdown the whole system.
- 17 -
5.3.3 When loads connected to UPS consume power more than 125% of the UPS
capacity, OVERLOAD indicator will be it. To protect the UPS from damages,
LEONICS designed Automatic Transfer Switch system to bypass the system.
At that time, the power supplies to loads is direct from utility line. This
situation may happen when loads draw very high current such as when user
turns on computers. When the loads consume power less than 125% for 10
seconds, UPS switches back to normal operation mode.
5.3.4 If you connect loads to UPS more than 100% (OVERLOAD indicator is lit ),
we recommend you to unplug some of them until %load is less than 100% to
let loads get high quality power from UPS and backup power from battery
Note: LEONICS suggests that for highest reliability and safety that you should
connect loads at no more than 75 % of rated UPS power. This allow for loads
that change power level during use and provides for some reserve backup power
for some loads.
5.4 Using UPS when power fails
5.4.1 When power line fails, UPS still supplies power which comes from backup
batteries to load for 15-90 minutes. The duration that it can supply depends
on %load and battery level. When battery power is weak (about 2 minutes
before UPS fully shuts down), LOW BATT. indicator is blinking and alarm sounds
To mute the alarm, press FUNC. button. When utility power returns to
normal status and UPS still has backup power left, UPS automatically switches
back to normal operation and charges battery at the same time.
5.4.2 When UPS is supplying backup power and does not have any loads connected,
UPS will shut down in 10 seconds to save battery backup power. (Set Noload
shutdown switch is on position).
5.5 Using UPS when UPS is malfunction
For NB 2K25, NBP 3K25, NBP 5K25 and NBP 6K25 which have manual bypass switch
(option), when UPS is malfunction, please turn the manual bypass switch at the back of
the UPS from position AUTO (A) to position BYPASS (B). The UPS changes to operate in
bypass mode. INVERTER LED is off while MAINTENANCE BYPASS LED and alarm sound is
on. All loads which connected to UPS OUTPUT are switched to connect to utility power
for temporary use. Then press POWER switch at the front to shutdown the UPS, turn off
INPUT circuit breaker and contact us or nearest service center.
