Powerware Uninterruptible Power Supply SOLA 4000 - Manual (Page 63)

SOLA 4000 - Operation
JUE 401266 63
• If an additional failure in the first unit occurs, or when the
battery of that unit is exhausted, the inverter of another unit will
takeover the load, continuing in battery operation until the
mains returns or the second battery is exhausted.
3.4 Bypass Operation
The "Bypass Operation" mode is activated by an overload or by
inverter failures in all units or by a manual commutation.
• The rectifiers supply dc power only to the batteries.
• The static inverter switch SSI of the unit supplying the load
opens automatically after the static bypass switch SSB is
closed.
• The load is supplied directly from the mains through the static
bypass.
• If the transition to "Bypass Operation" was caused by a tempo-
rary overload, the UPS system returns automatically to "Normal
Operation", any inverter may takeover the load, when the load
returns to within tolerance.
3.5 Maintenance Bypass Operation
"Maintenance Bypass Operation" is used to supply the load directly
from mains during maintenance or repair work.
• In this mode, the individual functional components of all units
are completely separated from the load.
• Power for the load is supplied directly from the mains through
the switch IBY.
3 Operating Modes Hot-Standby Operation