Powerware Uninterruptible Power Supply SOLA 4000 - Manual (Page 66)

SOLA 4000 - Operation
JUE 401266 66
4.5 Bypass Operation
The "Bypass Operation" mode is activated by a multiple inverter
failure or overload
• If the load is greater than 110% of the load capacity of all
available inverters, the static bypasses of all individual units
will connect the load with the mains directly
• All inverter output switches (SSI) will open, inverters may
continue to operate
• The rectifiers continue to charge the batteries
• If the load is reduced to 100% or less of the load capacity of all
available inverters, the system switches automatically back to
normal operation
• All bypasses always switch on together.
• If a standby unit was off at the time of the inverter failure/
overload, it will automatically switch ON and all units take-over
the load.The operation then becomes as in paragraph 4.1
(when there was an overload) or as in paragraph 4.4 (when an
inverter failure occurred).
4.6 Maintenance Bypass Operation
The "Maintenance Bypass Operation" mode is used to supply the
load directly from mains during maintenance or repair work.
• During this mode, the individual functional components are
completely separated from the load (e.g. for maintenance work)
• Power for the load will be supplied directly from mains through
internal or external power switch(es) (IBY)
Note: If the 3-position maintenance bypass cabinet MB3/2 is
installed, the UPS system may be totally isolated from all
supply by switching to the 3rd position "UPS ISOLATED".
Again the load will be supplied through the maintenance bypass
switch.
4 Operating Modes Parallel and Parallel/Redundant
Operation