OPERATING INSTRUCTIONS NORDAC Frequency Inverters

10.0 Mains filter
Normal version contains:
- Line choke | to protect the inverter
- Capacitors |---> against normal mains
- Varistors | voltage peaks
Special cases:
- Installation of a standard mains filter ---> protects against high-frequency voltage peaks
(data on request) (e.g. in the case of power-factor correction systems, welding equipment etc.)
10.1 Radio interference suppression
RFI suppression is possible if required.
Reducing the emitted interference to the value of limit value class B in accordance with VDE 0871:
- with mains-circuit coupling ---> by use of standard RFI suppression filters
- with emitted interference ---> by use of a screened cable or
of the motor supply line lay in earthed heavy-gauge steel conduit
a) Arrange earth connection (PE) a)
- ensure very low resistance
- arrange connection/transition with
large cross-section
Screening
- bring as close as possible to the
inverter and the motor (< 0,2 m)
- do not interrupt
- connect on both sides to earth (PE)
If (a) is not sufficient to suppress
interference --> try b)
b) As a), but in more advanced form, with b)
line compensation choke or standard output
filter with higher damping
(chokes and filters available on request
at extra charge)
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