Everest XCR - Product Manual |
Wiring and Connections
INGENIA | 08/04/2019
38
Motor Choke
In applications where electromagnetic compatibility is a needed, the use of an external common mode choke is
necessary on the motor phases.
Note that on applications where the drive is mounted inside the motor or actuator the choke and cable shields may
be removed. While the actuator enclosure will provide shielding against radiated EMC, the need or not of common
mode choke will depend on motor construction, specially capacitive coupling between windings and housing as
well as EMC requirements.
Some choke wiring recommendations are:
•
Place the choke as
close to the drive
as possible. The objective is to cancel the noise close to its source (the
switching power stage).
• Make sure the chosen choke
does not saturate at the maximum operating phase current
. If this happens,
the choke temperature would increase rapidly.
•
Make only 1 or 2 turns of the motor cables. More than 2 reduces its effectiveness as capacitive coupling
between wires bypass he choke effect.
•
PE conductor should never
pass through the choke.
• Avoid contact of the toroid core with a grounding point.
Next table shows recommended chokes for the Everest XCR.
Type
Manufacturer
Part number
Remarks
Wide frequency oval ferrite cable
core
Laird Technology
28B0773-050
Single turn. Preferred option.
Wide frequency cylindrical
ferrite cable core
Lair technology
28B0999-000
Double turn option. Higher
attenuation.
In case of doing 2 turns, space the phases 120º apart. Start each phase wire in the same rotating direction,
wrapping all phases clockwise or anticlockwise. This will add the common mode flux and increase its impedance.
9.3.6. Power Wiring Recommendations
Cable Selection
Power cables for the Everest XCR must be designed according to the averaged RMS current of the application.
Please follow the next recommendations:
•
The cable insulator must tolerate
≥
180 ºC. Silicone or Teflon insulation are suggested. PVC cables are not
recommended due to their low operation temperature.
•
Use flexible cables to prevent mechanical stress to the solder joints.
• The diameter of the conductor should not exceed 2.4 mm, the solder pad has 2.6 mm diameter.
Following are some recommended wire gauges. The minimum gauge is based on a self heating to 180ºC of a
Silicone or Teflon cable. Note that this may not be acceptable in applications that cannot tolerate this cable
temperature.
Operating RMS
current
Minimum Cross
Sectional Area (CSA
mm²)
Minimum wire
gauge
Recommended Cross
Sectional Area (CSA mm²)
Recommended
wire gauge
30 A
1.3 mm²
16 AWG
3.3 mm²
12 AWG
