INSTALLATION
23
5.3.4
Frequency controller
If the hose pump is fitted with a Bredel Variable
Frequency Drive (VFD), consider the following points:
•
Take precautions so the motor does not re-start
automatically after an unscheduled stop.
In the event of a power or mechanical failure,
the Bredel VFD controls the motor to stop.
When the cause of the failure is removed, the
motor can restart automatically. The automatic
restart is dangerous to certain installations of
the pump.
•
All control cables outside the enclosure must be
shielded and have a cross sectional area
between 0.22 and 1 mm
2
. The shielding must
be connected to earth at both ends.
Maximum permissible loads [N] on the pump
flange
Force
Bredel 25
Bredel 32
F1
600
600
F2
500
500
F3
200
200
WARNING
A Bredel VFD that is fitted
without the con-
trol switch
starts automatically when power
is applied.
