Electrical connection
8.3 System integration
1FW3 complete torque motors
312 Configuration Manual, 08/2020, A5E46027705B AA
8.3.5 Shielding, grounding, and equipotential bonding
Important notes regarding shielding, grounding and equipotential bonding
The correct installation and connection of the cable shields and protective conductors is of
crucial importance, not only for personal safety but also for noise emission and noise
immunity.
Hazardous touch voltages can be present at unused cores and shields if they have not
been grounded or insulated.
• Connect the cable shields to the respective housings through the largest possible
surface area. Use suitable clips, clamps or screw couplings to do this.
• Connect unused conductors of shielded or unshielded cables and their associated
shields to the grounded enclosure potential at one end as minimum.
Alternatively:
Insulate conductors and their associated shields that are not used. The insulation must
be able to withstand the rated voltage.
Further, unshielded or incorrectly shielded cables can lead to faults in the drive – particularly
the encoder – or in external devices, for example.
Electrical charges that are the result of capacitive cross coupling are discharged by
connecting the cores and shields.
Device damage as a result of leakage currents for incorrectly connected protective
conductor
High leakage currents may damage other devices if the motor protective conductor is not
directly connected to the power module.
• Connect the motor protective conductor (PE) directly at the power unit.
Device damage as a result of leakage currents for incorrect shielding
High leakage currents may damage other devices if the motor power cable shield is not
directly connected to the power module.
• Connect the power cable shield at the shield connection of the power module.
Note
Apply the EMC installation guideline of the converter manufacturer. For Siemens converters,
this is available under document
order No. 6FC5297-☐AD30-0☐P☐.
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