Powerware Uninterruptible Power Supply SOLA 4000 - Manual (Page 61)

SOLA 4000 - Operation
JUE 401266 61
2 Operating Modes Stand-alone Unit
2.3 Bypass Operation
The "Bypass Operation" mode is activated by an inverter failure or
an overload
• The rectifier supplies dc power only to the battery.
• The static inverter switch SSI opens automatically after the
static bypass switch SSB is closed.
• The load is supplied directly from the mains through the static
bypass line.
2.4 Maintenance Bypass Operation
The "Maintenance Bypass Operation" mode is used to supply the
load directly from the mains during maintenance or repair work.
• In this mode, the individual functional components are com-
pletely separated from the load.
• Power for the load is supplied directly from the mains through
the switch IBY.
2.5 Standby Operation
If an appropriately programmmed IPR pcb is inserted in the control
electronic of the stand-alone unit, as an option, this mode of
operation is possible.
• If the load is completely switched off, the inverter and the
inverter static switch SSI, switch off and the UPS commutates
to the bypass supply (SSB closes), thus saving power when the
UPS is not needed.
• When the load is again switched on, the inverter automatically
switches on and the inverter static switch SSI will commutate
the load to the protected inverter supply.