CHAPTER 2 – POWER ELECTRONICS AND CABINET FEATURES 46
2.7.2 Function
Fan groups
For control reasons, the fan unit(s) of the drive and
the integrated transformer are combined to
groups, for example:
• Fan unit 1 of the drive and fan unit 1 of the inte-
grated transformer belong to group 1.
• Fan unit 2 of the drive and fan unit 2 of the inte-
grated transformer belong to group 2.
The fan units of a group are always switched on
and off together.
Starting, stopping
The standard fan group 1 is switched on by the
control system of the drive when charging of the
DC link is initiated. When the drive is stopped, the
fan group continues to run for a preset time after
the main power has been switched off and the DC-
link voltage has decreased below a preset value.
Operating intervals
Parameter setting allows to run one of the two
fans continuously, or to run the fans alternately in
adjustable intervals. The intervals are set with
parameters.
Air flow inside the drive
The fan group of the cabinet feeds the cooling air
to the main power electronic components and
transfers the heat to the outside of the cabinet.
For further information on settings for
the cooling system, see signal and
parameter table, section automatic con-
verter-fan change-over.
2-17 Example for the
operating time of the fan
units
2-18 Air flow inside the
cabinet
Fan 1 or fan group 1
Fan 2 or fan group 2
on
on
off
off
To Next Page
Loading...
