Emc General Installation Considerations - Parker 590+ DRV Product Manual

EMC General Installation Considerations

Earthing Requirements
IMPORTANT
Protective earthing always takes precedence over EMC screening.
Protective Earth (PE) Connections
NOTE
In accordance with installations to EN60204, only one protective earth conductor is permitted at each protective earth terminal contacting
point.
Local wiring regulations tale precedence and may require the protective earth connection of the motor to be connected locally, i.e. not as specified in
these instructions. This will not cause shielding problems because of the relatively high RF impedance of the local earth connection.
EMC Earth Connections
For compliance with EMC requirements, we recommend that the "0V/signal ground" be separately earthed. When a number of units are used in a
system, these terminals should be connected together at a single, local earthing point.
Control and signal cables for the encoder, all analogue inputs, and communications require screening with the screen connected only at the VSD
(Variable Speed Drive) end. However, if high frequency noise is still a problem, earth the screen at the non-VSD end via a 0.1μF capacitor.
NOTE
Connect the screen (at the VSD end) to the VSD protective earth point, and not to the control board terminals.
Cabling Requirements
Planning Cable Runs
•
Use the shortest possible motor cable lengths.
•
Use a single length of cable to a star junction point to feed multiple motors.
•
Keep electrically noisy and sensitive cables apart.
•
Keep electrically noisy and sensitive parallel cable runs to a minimum. Separate parallel cable runs by at least 0.25 metres. For runs longer
than 10 metres, separation should be increased proportionally. For example if the parallel runs were 50m, then the separation would be
(50/10) x 0.25m = 1.25m.
•
Sensitive cables should cross noisy cables at 90°.
•
Never run sensitive cables close or parallel to the motor, dc link and braking chopper circuit for any distance.
•
Never run supply, dc link or motor cables in the same bundle as the signal/control and feedback cables, even if they are screened.
•
Ensure EMC filter input and output cables are separately routed and do not couple across the filter.
DC590+ DRV Series DC Digital Drive
B-13
Certification