Chapter 3 Environment description and installation
3-12
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Further good EMC practice IP20 models
Connect the power cable including Earth as shown
Use shielded (screened) or steel wire armoured cable'
Strip the cable cover and clamp the screen
to backplate
Frame 1
**PE1 & PE2 don't connect inside the inverter
Panel grounding
Clamp screen to the motor frame
Connector length should be short < 50mm.
panel
Motor
L1 L3 PE1
Frame 1
U V W
Frame 2
Panel grounding
Clamp screen to the motor frame
Connector length should be short < 50mm.
panel
Motor
L1 (L2) L3 PE
Frame 2
U V W PE
•
A ferrite choke in the output of the main circuit can suppress conducted emissions. To limit
the effects of radiated emissions unscreened motor cables should be put in an earthed metal
conduit. Do not run control cables inside conduit or within 30 cm of the motor cables.
•
If control/signal cables must cross over motor cables, ensure that they do so at right angles
(90°).
•
The supply and output (PE) terminals should to be connected to ground to increase noise
immunity of the integrated EMC filter.
•
To prevent RF interference resulting in
iDrive
operation error, control circuit wiring should
be shielded and twisted. Please refer to following diagram, connect shielded wire to ground
terminal at one end only. The wiring distance should be less than 50m.
•
Earth / ground wiring should be made as short and thick as possible. Copper braided tape is
better than cable for this application, but not always practical.
•
Do not ‘daisy-chain’ the earth / ground of the inverter to other equipment. Connect the (PE)
terminal to a centralized main earth / ground point and ‘star’ connect all other equipment
ground wires to this point.
•
Do not make a loop when several inverters share a common ground point.
Do not connect this end
Shield
PVC coating
Wrapped with
insulating tape
To ground (PE) terminal
