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UPS for 208 Vac Grid, B120US Installation Guide, doc. rel. 3.0
1.
Turn off all ac and dc CBs and isolate the system.
2.
Connect an average or standard load to the system.
3.
Turn on ac input CBs and measure the ac input voltage during operation under load.
Take the measurements at the output terminals of UPS
(phase-to-phase between L1-L2,
L2-L3, and L3-L1 and phase-to-neutral at L1, L2, and L3).
4.
Check and record the total system load (output current) and make sure that the UPS
is
not overloaded with respect to system specifications.
5.
Verify that UPS
is operating normally and that no alarms or fault indications are present.
3.4.3.
Test: Battery and blackout mode
This test is designed to verify the operation of UPS
in the event of a blackout, when no ac power
is supplied to the UPS.
To perform this test, the system must be in
Normal Mode
plus the battery must be
attached and fully charged.
To perform the battery mode blackout test:
1.
Turn all ac input to the system OFF.
Turn OFF the ac input switches to both Bypass and Rectifier.
2.
Test the voltage at the system output between the phases and the neutral.
It should be within the specified range of 120 Vac ±3%.
3.
When complete turn ac input on.
The batteries revert to charging.
3.4.4.
Test: ATS
If the input of the system is configured to run from both the grid and, during grid power failure,
from the generator verify that the ATS (Automatic Transfer Switch) provides the full 10 second
changeover time. The system will transfer to battery mode when the grid feed is dropped. Once
the 10 second changeover time is complete and the generator has begun supplying ac the UPS
will begin to operate the rectifier.
