nord NORDAC START Series User Manual
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Contents
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2 Assembly and installationBU 0135 en-4118 392.3.1 Wiring guidelinesThe soft starters have been developed for use in an industrial environment. In this environment,electromagnetic interference can affect the device. In general, correct installation ensures safe andproblem-free operation. To meet the limiting values of the EMC directives, the following instructionsshould be complied with.1. Ensure that all devices are securely earthed to a common earthing point or earthing rail using shortearthing cables with a large cross-section. It is especially important that each control unit which isconnected to the electronic drive technology (e.g. an automatic device) has a short cable with alarge cross-section, which is connected to the same earthing point as the device itself. Flat cables(e.g. metal stirrups) are preferable, as they have a lower impedance at high frequencies.2. The bonding cable of the motor controlled by the soft starter should be connected directly to theearthing terminal of the associated device. The presence of a central earthing bar in the controlcabinet and the grouping together of all bonding conductors to this bar normally ensures safeoperation.3. Where possible, shielded cables should be used for control circuits. The shielding at the cable endshould be carefully sealed and it must be ensured that the wires are not laid over longer distanceswithout shielding.The shields of analogue setpoint cables should only be earthed on one side on the device.4. The control cables should be installed as far as possible from power cables, using separate cableducts, etc. Where cables cross, an angle of 90° should be ensured as far as possible.5. Ensure that the contactors in the cabinet are interference protected, either by RC circuits in thecase of AC contactors or by free-wheeling diodes for DC contactors, for which the interferencetraps must be positioned on the contactor coils. Varistors for over-voltage limitation are alsoeffective.6. Shielded or armoured cables should be used for the load connections (motor cable if necessary).The shielding or armouring must be earthed at both ends. The earthing should be provided directlyto the PE of the device if possible.In addition, EMC-compliant wiring must be ensured.The safety regulations must be complied with under all circumstances when installing thedevices!NOTICE Damage due to high voltageThe 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 which is to be tested from the device before performing a high voltage insulation test.Information Looping of the mains voltageThe permissible current load for the connection terminals, plugs and supply cables must be observed whenlooping the mains voltage. Failure to comply with this will result in thermal damage to current-carrying modulesand the immediate vicinity thereof.If the device is installed according to the recommendations in this manual, it meets all EMC directiverequirements, as per the EMC product standard EN 60947-4-2. |
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