Kohler PowerWAVE 9500DPA User Manual page 16

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Battery discharge operation
A Low Battery alarm is generated when the battery discharges to a preset level. This allows the operator to gauge the
remaining autonomy time and, if necessary, shut-down the load in an orderly manner (e.g. save data) before the battery
reaches its end-of-discharge voltage. Various options are available to automate the load shut-down process.
When the battery is initially put on load the BATTERY led flashes green on the UPS module control panel and this
continues until the remaining autonomy time falls to 3 minutes whereupon the led begins flashing red. If an automated
data protection application is installed it usually begins its shut down routine at this point.
The BATTERY led changes to solid red when the battery reaches its fully discharged voltage, and the UPS will attempt to
transfer the load to the bypass supply if it is present.
UPS On-bypass mode
In the 'on bypass' mode the static
switch connects the load to the
unprotected static bypass line.
This mode can be selected manually
(see 'ECO Mode' below) or entered as
the result of a UPS fault or overload
condition which transfers the load to
bypass because the inverter is unable
to support it.
Depending on the reason for entering
the 'load on bypass' mode, the rectifier
and charger sections might be turned
off entirely or remain operational and
continue to charge the battery, as shown above. Similarly, the inverter may have been manually turned OFF or shut down
due to a fault, and the INVERTER led on the module control panel may be either OFF or solid RED.
Key Point: When several UPS modules are connected as a parallel system they must all operate with the same
output mode – i.e. they must ALL be either 'on-inverter' or 'on-bypass'. So if you transfer the load between the
inverter and bypass on one UPS module, every module in the system will automatically change state.
Module OFF (Maintenance bypass)
Note: The maintenance bypass facility
is an optional feature.
When all the UPS modules are turned
OFF, the cabinet's maintenance
bypass switch (IA-1) can be closed to
maintain the load supply, but this
requires the bypass mains supply to
remain live and thereby prevents the
cabinet's bypass supply from being
externally isolated.
When operating a multi-cabinet
system, the internal cabinet
maintenance bypass switch is not
normally fitted and an external
maintenance bypass facility that
wraps-around the complete multi-
cabinet system is provided as part of the UPS system installation – see Page 39.
Note: When switching to/from the maintenance bypass mode the UPS is normally transferred to the static bypass mode
before the maintenance bypass switch is operated. This secures the load supply during the switching process.
8
UPS Bypass
Static bypass line
Mains
Bypass
Contactor
UPS Input
RECTIFIER
Mains
BOOSTER /
BATTERY
CHARGER
IA-1
UPS Bypass
Static bypass line
Mains
Bypass
Contactor
UPS Input
RECTIFIER
Mains
BOOSTER /
BATTERY
CHARGER
Figure 2.8 Module OFF (Load on maintenance bypass)
TS_622_02 PowerWAVE 9500DPA User Manual 26/2/19
STATIC
SWITCH
INV. Output
INVERTER
Contactor
UPS MODULE
Figure 2.7 UPS On-bypass
Maintenance bypass line
STATIC
SWITCH
INV. Output
INVERTER
Contactor
UPS MODULE
UPS AC
Output
UPS AC
Output