Other loads connected to the mains may produce voltage spikes that may interfere with functioning
of the inverter or may even damage it. Chokes or main filters can be used on the mains side to
protect the inverter against voltage spikes (resulting from switching large loads to the mains, for
example). Such chokes and filters are available as accessories.
If inverters are operated in a switchgear or in their close proximity (e.g. in one common control
cabinet) in connection with the same power mains, we recommend the following precautionary
measures to suppress interference in the switchgear:
• Wire the coils of contactors, switchgear devices and relay combinations with RC elements or
with free-wheeling diodes.
• Use shielded cables for external control and measuring cables.
• Lay disturbing cables (e.g. power and contactor control circuits) separately and at a distance
from the control cables.
12.5. Mains back-up fuses
External upstream fuses are required to protect the cables and the unit itself. The fuses must be
dimensioned so as to permit starting up and normal operation of motors. To guarantee this, we
recommend the use of the followings slow-blow fuses :
Mains input 1 x 230V
0.37kW 0.55kW 0.75kW 1.1kW 2.2kW
4A 8A 8A 8A 16A
Mains input 3 x 400V
0.75kW 1.1kW 1.5kW 2.2kW 3.0kW 4.0kW 5.5kW
4A 6A 6A 8A 10A 16A 20A
Mains input 3 x 400V
7.5kW 11.0kW 15.0kW 22.0kW 30.0kW 37.0kW
35A 35A 63A 63A 80A 100A
BERGES electronic
18 Operating manual ACM-D2 29.05.98
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