Conditions For Connection; Emc Notes - DEMAG DIC 002 Series Operating Instructions Manual

6.5.2

Conditions for connection

● The frequency inverter is suitable for connection to a public or industrial power supply network according to the
technical data. If the transformer output of the power supply network ≤ 500 kVA, the optional line reactor is only
required for the frequency inverters marked accordingly in the technical data. All other frequency inverters are
suitable for connection without a line reactor at a relative system fault level (ratio between Active Power input
and system fault level) ≥ 1%.
● Check connection to a public power supply without any further measures in accordance with the provisions of
standard EN 61000-3-2. Frequency inverters ≤ DIC-4-017 or DIC-2-018 with an integrated mains filter and a
motor cable length of up to 10 m comply with the emission limit values according to product standard EN
61800-3 without any further measures. Increased requirements resulting from the application environment of
the frequency inverter must be met by the use of optional components. Line reactors and line filters are option‐
ally available for this product series.
● Operation in a non-earthed system (IT system) is allowed after the Y capacitors inside the unit have been dis‐
connected, see the section on "Separating the Y capacitor bridges" in the "Dedrive Compact STO frequency
inverter application notes/operating instructions"  Tab. 1, Page 2.
● Operation in a Dedrive Compact REG line system is allowed after the Y capacitors inside the unit have been
disconnected, see the section on "Separating the Y capacitor bridges" in the "Dedrive Compact STO frequency
inverter application notes/operating instructions"  Tab. 1, Page 2.
● Line filters must not be used in IT systems.
● Fault-free operation with a residual current device (earth-leakage circuit-breaker) is ensured with a tripping cur‐
rent ≥ 30 mA if the following requirements are met:
- Use of residual-current-operated circuit breakers sensitive to all types of currents (type B acc. to EN 50178)
e.g. Siemens 5SZ3...G00
- The earth-leakage circuit-breaker protects a frequency inverter with leakage-current reduced filter or without
a line filter.
- The length of the screened cable is ≤ 10 m and no further capacitive components exist between the mains
or motor cables and PE.
- The Y capacitors inside the unit must be disconnected, see the section on "Separating the Y capacitor
bridges" in the "Dedrive Compact STO frequency inverter application notes/operating instructions"
 Tab. 1, Page 2. This increases cable-bound emitted interference (EMC).
6.5.3

EMC notes

These frequency inverters are designed with interference immunity (EMI) for operation in industrial applications
according to the requirements and limit values of product standard EN 61800-3. Electromagnetic interference
must be avoided by appropriate installation and compliance with the specific product information.
Measures
● The frequency inverter and the line reactor must be fitted to the surface of a metal mounting panel, which
should ideally be galvanised.
● Ensure that there is a good equipotential bonding within the system or installation. Installation parts such as
switchgear cabinets, control desks, machinery frames, etc., must be connected with PE conductors over a
large surface area to ensure good conductivity.
● Ensure that the frequency inverter, the line reactor, external filters and other components are connected to
each other via short cables with one earthing point.
● Avoid excessive cable lengths and freely hanging cables when installing cables and wiring.
● Contactors, relays and magnet valves in the switchgear cabinet must be provided with suitable interference
suppression components.
● Cable screens must be earthed and connected to the unit with a low resistance and over a large surface area.
Provide a 360° earth connection using appropriate screen clamps.
● Unplaiting screens and making contacts by means of long single conductors (so-called pig tails) must be avoi‐
ded.
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