Kohler PW 6000, Руководство пользователя

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2: Description
2-4
UPS413-01-00 Kohler PW 6000 (60-500kVA) User Manual 25 June 2012
When operating in the ‘Load on Inverter’ mode the inverter output frequency is synchronised to the bypass
supply provided the bypass supply 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 that will
maintain the output frequency at a constant 50/60Hz.
When operating from battery power various alarms are generated at preset voltages as the battery
discharges. This enables the operator to 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, as described in Chapter 7 of this manual (Options).
Load on Bypass
In the ‘Load on
Bypass’ mode the load
supply is connected to
the unprocessed static
bypass line via the
static switch.
When operating in this
mode the rectifier,
charger and inverter
sections can be turned
off entirely or remain
running, and continue
to provide battery
charging.
Inverter/Bypass load transfer
As illustrated in the above diagrams, the load is connected to the inverter or static bypass power circuits by
means of the static switch. This is a solid state switch which is operated by the UPS microprocessor control
system and allows the inverter/bypass operating mode to be selected manually via the UPS operator control
panel or automatically depending on various UPS operating conditions
(see paragraph 2.3.3) .
Load on Maintenance
Bypass
In this mode of
operation the manually
closed maintenance
bypass switch
connects the load
supply directly to the
unprocessed bypass
supply. This is used to
keep the load supplied
(albeit without any
power protection)
whilst allowing the
remainder of the UPS
to be shut down for
service repair.
Note: Live voltages are still present on the UPS input and output power terminals when in this mode.
To prevent possible inverter damage, it is important that the inverter output and maintenance bypass lines
are never connected in parallel. Therefore when transferring from the ‘load on inverter’ mode to the ‘load on
maintenance bypass’ mode it is important that the load is first transferred to the static bypass (‘load on
bypass’) before the maintenance bypass switch is closed – always follow the operating instructions in
Chapter 4 of this manual when starting or shutting down the UPS.
MAINTENANCE BYPASS LINE
BATTERY
Bypass
Supply
Mains
Supply
Load
Supply
IA1
IA2
UPS MODULE
Charger
INVERTER RECTIFIER
STATIC
SWITCH
STATIC BYPASS LINE
Figure 2.3 Load on bypass
MAINTENANCE BYPASS LINE
BATTERY
Bypass
Supply
Mains
Supply
Load
Supply
IA2
UPS MODULE
Charger
INVERTER
STATIC
SWITCH
RECTIFIER
IA1
STATIC BYPASS LINE
Figure 2.4 Load on maintenance bypass