30 Operation principle and hardware description
Converter unit control devices
DC switch/disconnector
The DC/DC converter cabinet can be equipped with DC switch/disconnector [Q11.xx]. 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. When the unit
is reconnected to the DC bus, the capacitors of the converter modules are charged
through a charging circuit.
For more information, see DC bus connection and capacitor charging on page 24.
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
A converter unit with a DC switch/disconnector must also have a charging circuit including
a charging switch [Q10.x].
If the switches are connected as shown in the Example circuit diagrams, the charging
switch is closed first when the converter unit is connected to an energized DC bus. When
the charging is finished, the main DC switch/disconnector can be closed and the charging
switch opened. (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, for example, the following lamps on the DC/DC converter cabinet door:
• If you have the DC switch/disconnector installed - Charging OK indicator and DC/DC
converter disconnected indicator
• You can connect a Load disconnected indicator to the disconnecting device of the
energy storage.
BCU control unit
The DC/DC converter module is controlled by a BCU control unit.
For more information, see chapter Control unit on page 161.
ACS-AP-x control panel
The ACS-AP-x is the user interface of the converter unit. With the control panel, you can:
• start and stop the converter 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.
The control panel can be mounted on the cabinet door using a DPMP-01 mounting
platform (available separately).
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