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28 Operation principle and hardware description
Converter unit control devices
￭
DC switch/disconnector
You can equip the DC/DC converter cabinet with DC switch/disconnector [Q11]. A converter
unit with a DC switch/disconnector must also have a precharge circuit including a charging
switch.
The DC switch/disconnector allows the isolation of the unit from the DC bus. Before the unit
is reconnected to the DC bus, you must charge the capacitors of the converter modules
through a charging circuit.
WARNING!
You must also switch off the charging switch to disconnect the DC/DC converter
from the DC supply. Do not operate the DC switch/disconnector under load.
￭
Charging switch
If the converter is equipped with a DC switch/disconnector, you must equip the converter
unit with a charging circuit including a charging switch [Q10]. If you have connected the
switches as shown in the example circuit diagrams, close the charging switch first when the
converter unit is connected to an energized DC bus. When the charging is finished, close
the main DC switch/disconnector and open the charging switch. (The converter unit will not
start if the charging switch is closed.)
WARNING!
You must also switch off the charging switch to disconnect the DC/DC converter
from the DC supply.
￭
Door lights
You can install the load disconnected indicator on the cabinet door. This indicator shows
the state of the energy storage disconnecting device.
You can install also the charging OK indicator and DC/DC converter disconnected indicator,
if the DC switch/disconnector is equipped.
￭
BCU control unit
The DC/DC converter module is controlled by a BCU control unit. For more information, see
Control units of the
drive.
￭
ACX-AP-x control panel
The ACX-AP-x control panel is the user interface of the unit. With the control panel, you
can:
•
start and stop the unit
•
view and reset the fault and warning messages, and view the fault history
•
view actual signals
•
change parameter settings
•
change between local and external control.
To be able to start and stop the unit by the control panel, you must have the
parameter-defined Run enable signal and Start enable signal on (1). The control panel must
also be in local control mode.
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