Kohler PowerWAVE 9500DPA User Manual page 15

UPS On-inverter mode
This is the only operating mode that
provides the load with continuously
processed and backed-up power: and in
the majority of installations can be
considered as the 'normal' operating
mode.
In this mode, the UPS input mains is
converted to DC by the rectifier which
then charges the battery and provides
the operating power for the inverter.
The inverter converts the DC produced
by the rectifier back to an AC power
source which is then connected to the
load via the inverter output contactor.
The inverter frequency is synchronised to the bypass supply provided the bypass frequency remains within preset limits. If
these limits are exceeded, or if the bypass supply fails altogether, the inverter frequency control reverts to a free-running
oscillator which produces a constant 50Hz or 60Hz UPS output.
UPS On-standby (Xtra VFI mode)
Figure 2.5 shows the internal operation
of the UPS module when the Xtra VFI
function is enabled and the UPS is
operating on standby.
The rectifier is turned on and the battery
charger remains active but the inverter
is on standby, and ready when called
upon by the Xtra VFI operation.
UPS On-battery mode
If the input mains supply fails, the
rectifier shuts down and the battery
provides the DC power source for the
inverter. The battery voltage is
regulated by the booster circuit to
ensure the inverter receives a suitable
DC input voltage as the battery
discharges. On the module control
panel the BATTERY led will flash green
to indicate that it is on load.
In the case of a dual feed input – if the
bypass supply is still live when the input
mains supply fails, the inverter
frequency remains synchronised to the
bypass mains provided it is within its preset limits.
In the case of a single feed input – the bypass supply will fail at the same time as the input mains supply and the inverter
frequency control reverts to its free-running oscillator and will provide a constant 50Hz or 60Hz UPS output.
TS_622_02 PowerWAVE 9500DPA User Manual 26/2/19
UPS Bypass
Static bypass line
Mains
Bypass
Contactor
UPS Input
RECTIFIER
Mains
BOOSTER /
BATTERY
CHARGER
UPS Bypass
Static bypass line
Mains
Bypass
Contactor
UPS Input
RECTIFIER
Mains
BOOSTER /
BATTERY
CHARGER
UPS Bypass
Static bypass line
Mains
Bypass
Contactor
UPS Input
RECTIFIER
Mains
BOOSTER /
BATTERY
CHARGER
STATIC
SWITCH
INV. Output
INVERTER
Contactor
UPS MODULE
Figure 2.4 UPS On-inverter
STATIC
SWITCH
INV. Output
INVERTER
Contactor
UPS MODULE
Figure 2.5 UPS On-standby
STATIC
SWITCH
INV. Output
INVERTER
Contactor
UPS MODULE
Figure 2.6 UPS On-battery
:
UPS AC
Output
UPS AC
Output
UPS AC
Output
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