NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
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BU 0200 en-US-4920
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2.4.1 Wiring guidelines
The devices were developed for use in an industrial environment. Electromagnetic interference in this
environment can cause disturbances in the device. In general, correct installation ensures safe and
problem-free operation. To meet the limiting values of the EMC directives, take account of the
following instructions.
1 Make sure that all devices connected to a common grounding point or a grounding bar are well
grounded using short ground conductors with a large cross-section. It is especially important that
each control unit which is connected to the electronic drive equipment (e.g. an automatic device) is
connected to the same grounding point as the device itself through a short conductor with a large
cross-section. Flat conductors (e.g. metal brackets) are preferable as they have a lower impedance
at high frequencies.
2 Connect the PE conductor of the device-controlled motor as directly as possible to the ground
terminal of the associated device. The presence of a central grounding bar and the grouping
together of all protective conductors on this bar normally ensures proper operation.
3 Use shielded cables for control circuits where possible. Connect the shielding at the cable end
carefully and make sure the wires do not run over long stretches without shielding.
The shields of analog setpoint cables should only be grounded on one side on the device.
4 Install control cables as far as possible from power cables using separate cable ducts, etc.Create
an angle of 90° in cable crossings where possible.
5 Make sure the contactors in the cabinets are interference-protected by using either RC circuitry in
case of AC contactors or freewheeling diodes for DC contactors,
whereby the interference
suppression devices are attached to the contactor coils
. Varistors for overvoltage limitation are
also effective.
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6 Use shielded or armored cables for load connections (motor cable, if necessary). The shielding or
armoring must be grounded at both ends. Grounding should be done directly on the PE of the
device if possible.
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In addition, EMC-compliant wiring must be ensured.
Observe the safety regulations under all circumstances when installing the devices!
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NOTICE
Damage due to high voltage
The device may be damaged by electrical loads which do not correspond to its specification.
• Do not perform any high-voltage tests on the device itself.
• Disconnect the cable to be tested from the device before performing a high-voltage insulation test.
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Information
Daisy-chaining of the line voltage
Adhere to the permissible current load for connection terminals, plugs and supply cables when Daisy-chaining the
line voltage. Noncompliance will result in thermal damage to live modules and their immediate vicinity.
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If the device is installed according to the recommendations in this manual, it meets all EMC directive
requirements as per the EMC product standard EN 61800-3.
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