Function and hardware description 37
Cooling system
The drive unit and the transformer unit are each equipped with one or several fan units,
depending on the drive type. Optionally, the drive and the integrated transformer can each
be equipped with a redundant fan configuration. This configuration ensures that the
operation of the drive system is not interrupted if a fan fails.
Fan units on top of transformer unit
Function
Fan groups
For control reasons, the fan unit(s) of the drive and the integrated transformer are
combined to groups.
• Fan unit 1 of the drive and fan unit 1 of the integrated transformer belong to group 1.
• Fan unit 2 of the drive and fan unit 2 of the integrated transformer belong to group 2.
The fan units of a group are always switched on and off together.
Starting, stopping
The standard fan unit or fan group 1 is switched on by the control system of the drive when
the charging of the DC link is initiated. When the MCB has opened, the fan units continue
to run for a preset time.
Air flow inside the drive
Drive unit: the fan unit feeds the cooling air to the main power electronic components and
transfers the heat to the outside of the cabinet.
Transformer unit: the fan unit feeds the cooling air to the transformer and transfers the
heat to the outside of the cabinet.
The air enters the drive cabinet through the louvered panels at the front, passes the power
modules in the INU compartment, or the transformer in the TRU. The air then exits through
the outlet of the fan unit on the cabinet top.
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