
17
ANTRIEBSTECHNIK
If personnel protection is required during installation of the system the frequency
inverters must be protected according to EN 50178:
•
1-phase inverters by RCD type A (pulse-current sensitive FI’s) or type B (all-current
sensitive FI’s)
•
3-phase inverters (with B6 bridge-connected rectifier) by RCMA’s with separation
(used privileged) or RCD’s type B (all-current sensitive FI’s)
The tripping current should be 300mA or more, in order to avoid a premature triggering
of the inverter by discharge currents (about 200mA).
Dependent on the load, the length of the motor cable and the use of a radio interference
filter, substantially higher leakage current can occur.
The connection instructions from the manufacturer and the valid local reqirements must
be observed.
Dependent on the available mains form (TN, IT, TT) further protective measures are
necessary in accordance with VDE Part 410 (Part 4; Chapter 41). For example, with TN-
mains this protection is made with overcurrent protective devices. With IT-mains it is
insulation monitoring with a pulse-code measuring method. A protective separation can
be used with all mains forms as long as the required power and cable lengths permit this.
The person setting up the unit must present proof of compatibility before installing the
inverter!
RCD
(FI-Protective
Switch)
Mains
to further
sub-divisions
Outlet 1
Outlet 2
Outlet 3
Level 1
Level 2
Typ
A
Typ
A
RCD
Typ A
sel. T
RCMA/
RCD
Typ B
Isolator
in accordance with
EN 60947-2
To further consumers that do not
prevent the tripping of the FI.
To the consumers not
compatible with FI.
Circuit diagram of low voltage distribution (principle of the protective elements)
Содержание COMBIVERT Series
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