Chapter 2: SAFETY
Operating Manual FU3AM-03
Page 11 of 30
2.9 Operation of the frequency inverter
Operate the frequency inverter only if it is in perfect condition. The permissible conditions of
use and output limits must be complied with.
Retrofitting, modifications or conversions of the frequency inverter are
forbidden
. In all such
cases, the manufacturer must be consulted.
The frequency inverter is an item of equipment for use in industrial installations. During op-
eration, these items of equipment have dangerous, live components. Consequently, during
operation all covers must be fitted to the drive controller, in order to ensure full protection
from contact with it.
The modules include electro statically sensitive CMOS und MOS components. Caution must
be exercised in respect of electrostatic charges.
2.10 Important instructions on protective earthing
Because of the loss currents of the essential mains filter (>3.5 mA) via the protective earth-
ing conductor (PE), according to DIN VDE 0160 the cross-sectional area of the lead-in wire
of the protective earth wire to the switch cabinet must be at least 10 mm² Cu, or a second
protective earth conductor must be laid electrically in parallel.
In the case of higher installed loads, the minimum cross-sectional area of the protective
earth conductor must be in a corresponding relation to the cross-section of the outer conduc-
tors (see DIN 57100 Part 540).
The loss currents of the filter may be as high as 100 mA. Operation with FI earth leakage
circuit breakers is therefore not possible.
2.11 Important instructions on routing of wires
Control lines and power cables must always be routed separately with a gap between them.
Tacho inputs, set point and analogue control inputs must be laid using shielded cables.
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