TS_604_01 PowerWave PW3000/TP User Manual UK 5/1/18
7
2: General Description
Some installations include a standby generator which is designed to start-up automatically and provide an alternative UPS
power input within a short period following a mains failure. Once the UPS input power is restored from the standby
generator, the rectifier and charger will resume normal operation.
Battery discharge operation
As the battery discharges, various options are available to automate the load shut-down process, as described in Chapter
8 of this manual.
A SHUTDOWN IMMINENT alarm indicates when the battery is almost exhausted, with approximately 3 minutes autonomy
time remaining, and if a data protection application is installed it will begin its automatic PC shut down routine at this point.
When the battery reaches its fully discharged voltage the UPS will attempt to transfer the load to the bypass supply but if
the bypass supply is unavailable then the UPS will totally shut down.
Load on Bypass
Figure 2.4 Load on bypass
In the ‘load on bypass’ mode the UPS AC Output is connected to the unprocessed static bypass line via the bypass side of
the static switch.
During normal operation the load will be transferred from the inverter to the static bypass line in the event of an inverter
fault, output overload, or loss of system redundancy due to a failed module in a parallel module system. Load transfer can
also be initiated manually via the UPS control panel.
Depending on the reason for the load being transferred to bypass (i.e. manually transferred or transferred due to a fault),
The Rectifier/DC Converter and Inverter power blocks might turn off or remain running.
Load on Maintenance Bypass
Figure 2.5 Load on maintenance bypass
RECTIFIER /
DC CONVERTER
INPUT
EMI
FILTER
OUTPUT
EMI
FILTER
POWER
INVERTER
STATIC SWITCH
Mains
Input
External
Battery
(Option)
Bypass
Input
UPS AC
Output
Static Bypass Line
M1
M2
Maintenance Bypass Line
Maintenance Bypass Switch
Automatic
Batt. Switch
Output
Relay
CHARGER
Charger
Relay
BATTERY
RECTIFIER /
DC CONVERTER
INPUT
EMI
FILTER
OUTPUT
EMI
FILTER
POWER
INVERTER
STATIC SWITCH
Mains
Input
External
Battery
(Option)
Bypass
Input
UPS AC
Output
Static Bypass Line
M1
M2
Maintenance Bypass Line
Maintenance Bypass Switch
Automatic
Batt. Switch
Output
Relay
CHARGER
Charger
Relay
BATTERY
