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Placement

 

 

This UPS is intended for indoor use 
only;

 

its internal components are not 

sealed

 

from the environment. 

Please install it in a protected 
environment away from excessive heat 
or excessive moisture. 
 

 

 

 

Charging the UPS first   

 

The battery is fully charged at the 
factory. However, it is recommended to 
charge the battery at least 8 (eight) 
hours before using the UPS, since 
energy loss may have occurred during 
shipping or long duration storage. To 
recharge the battery, simply leave the 
UPS plugged into an AC outlet. 

Connecting your equipment to the UPS 

For UPS models with US-type outlets: connect the power cord(s) of your computer 
equipment to the output receptacle(s) of the UPS. 

For UPS with IEC outlets, as shown in the illustration, use your computer power cord to 
connect UPS to the wall socket. Use the power cord supplied with the UPS to connect 
your PC to one of UPS outlets (item 1.5 on the rear panel drawing below). 

 

Turn on the UPS 

 

To turn UPS on please press the power button for 3 seconds. Pressing the power button 
shortly under normal mode will enable the self-test function. The silence function can be 
enabled/disabled by shortly pressing the power button in backup mode. In addition, the 
power button can be used as the master on/off switch for your equipment by leaving your 
equipment connected to UPS and switched on. To turn off the UPS, please press power 
button for about 3 seconds.

 

Warning 

 

DO NOT PLUG LASER PRINTERS INTO THE UPS BECAUSE 
THEY TYPICALLY DRAW TOO MUCH POWER 

 
 
 
 
 
 

Fuse replacement procedure 

 
 

 
 
 
 
 
 
 
 
 
 
 

(Note: for 220V/230V/240V units only) 

1.

 

Use a slotted screwdriver to take out the fuse holder 

2.

 

Take out the busted fuse from the fuse holder 

3.

 

Use the screwdriver to push out the spare fuse from the holder 

4.

 

Put the spare fuse in the holder 

5.

 

Push the fuse holder back into the AC input socket 

6.

 

Follow the UPS turn on procedure 

 

Battery replacement procedure 

 

Note: Follow this procedure for safe replacement of the battery. However, small sparks may occur 
during the process. This is normal. 

 

           

 
 
 
 
 
 
 
 
 
 

1.

 

Turn off the UPS and unplug it from the wall outlet 

2.

 

Gently pull the top portion of the front panel until it unsnaps 

3.

 

Place the front panel on top of the unit taking care not to pull out the wires for the panel 

4.

 

Remove the screw for the battery cover 

5.

 

Gently pull out the batteries using the tab located at the base of the battery 

6.

 

Disconnect the two long wires connecting the batteries to the UPS 

7.

 

Use the short wire to connect between the batteries and push the new batteries into place 

8.

 

Connect the long wires to the new batteries, making sure that the red wire is connected to the red 
battery terminal of the lower battery and the black wire to the black battery terminal of the upper 
battery 

9.

 

Mount the battery cover and replace the screw 

10.

 

Snap back the front panel into place 

11.

 

Follow the UPS turn on procedure 

 

Front & Rear Panels 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

1.1 Power Button       1.5 UPS Outlets 

1.2 RS-232 Port

                       

1.6 Surge Suppression Outlet 

1.3 Phone/LAN Jack

           

1.7 Circuit Breaker 

1.4 AC Input          1.8 AC Fuse 
______________________________________________ 

No Load Shutdown Function 

As a battery saving feature, the UPS will automatically turn off if none 
of the connected equipment is operating while the UPS is in back-up 
mode. Once normal utility power returns, the unit will re-start 
automatically. You can disable the “No Load Shutdown” function by 
pressing the power button of your switched-off UPS until you hear two 
beeps.

 

Front panel LED (UPS status indicator) 

 

 

AC Mode 

When the LED is continuously lit and the 
buzzer is silent, the UPS is in normal mode and 
providing power to your equipment. The UPS 
will continue to filter electrical noise and 
provide surge protection. 

 

Battery Mode 

When the LED blinks every 2 seconds in time 
with the beeping sound, the UPS is providing 
power from its battery.   

 

Fault 

When the LED is flashing rapidly and the 
beeping sound is continuous, it indicates that 
the UPS is overloaded. 

 

www.opti-ups.com 

Thunder Shield 

TS1250W 

Wide range 

User Manual 

 

 

 

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