Ups Behavior During Mains Outage - Tescom DS3550 User Manual

4.3 UPS Behavior During Mains Outage

When the mains voltage is not available " R02 LINE FAILURE " message appears on LCD display. Sound
warning on and off is heard at the same time. UPS continues to supply the critical loads by converting the
battery voltage to AC voltage and provides operation without data losses or any other fault. Battery
autonomy time may be prolonged by shutting down the unnecessary loads for that moment.
But do not turn on these loads again during battery operation.
After a short period of time when the line voltage is available again, UPS returns to normal operation
automatically and the alarm message on the display disappears.
Shut down the critical loads in a period of minimum possible autonomy time (depends on the Ah capacity,
charge status, age of the batteries, actual load percentage of UPS and the ambient temperature).
Otherwise critical loads will be out of power at the end of battery autonomy time.
"A26 BATTERY LOW" message appears first on front panel display during battery operation if battery
voltage drops below a defined level.
"A10 BATTERY LOW SHUT" message appears on front panel display when the battery voltage drops to
the end of discharge voltage and UPS shuts itself down. Critical loads will be out of electrical power.
If a reserved generator in the system and if it's available, that will start to supply the necessary electrical
power to UPS input and batteries start to be charged immediately. By means of using UPS together with a
immediately available generator system, battery discharge time decreases and so they will be charged
quickly after a mains outage.
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