Tescom T-3250, User Manual, Page: 27 / 42

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4.5 Procedure For Switching The UPS ON From Static By-Pass
1.
Press on the UP or DOWN button until there is “COMMAND MENU” message on the front panel of the
UPS. Then press “ENTER” button.
2.
Press on the UP or DOWN button when there is “ENTER <INVERTER>” message on the front panel of
the UPS. Then press “ENTER” button for 3 seconds. L4 static bypass led is turned off and L6 inverter
led is lit. Now your load is supplied by the inverter.
3.
See “STATUS NORMAL!” message on the front panel. Now the UPS system is on normal operation.
You can start-up your PC, printer etc.
4.6 Procedure For Completely Powering Down The UPS
TURN OFF THE UPS
All the power switches, isolators and circuit breakers are turned off (“ 0 ” position). There will be no supply
voltage on the load.
WARNING!!! This procedure will cut the energy to all the equipments, which are
connected to UPS output.
•
Turn off
S1 (inverter input)
S2 (static by-pass)
S4 (UPS output) switches (to “0” position).
•
Open the battery Circuit Breaker (“0” position).
4.7 When Utility Power Is Interrupted
When there is a utility power interrupted, the L6 inverter led continuously lit also L3 battery and on the LCD
“A10 LINE FAILURE” message appears. And also an audible alarm sounds. Your UPS continues to convert
the battery voltage to AC voltage and protect against loss of data and failure. The autonomy can be increased
by disconnecting relatively unimportant loads. But do not connect this load again while the autonomy. When the
utility power is restored the UPS will return to normal operation and on the front panel of the UPS
“A45 MAINS
OK” mesage appears.
When there is a “ A7 BATTERY LOW ” message appears and audible alarm sounds shut down your PC. If not all
the batteries will be discharge in a few minutes.
After you shut down the critical load (computer system). Apply the completely powering down the UPS.
Apply the normal operation procedure to start up the UPS again after a long time later.
NOTE: Do not forget to turn on the battery circuit breaker into “1” (ON) position when there is a mains
voltage return. If not, in case of a second power cut there will be no voltage for the critical load.
If you have a reserve generator, you can use it to feed the UPS’s input and the batteries starts to
charge. By using UPS and the generator at the same time ensures to charge the batteries faster.