Certification
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
Page
C-7
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A
B
C
D
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7
E
Cabling Requirements
Note
Refer to Appendix E: “Technical Specifications” for additional Wire Sizes.
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.
Increasing Motor Cable Length
Because cable capacitance and hence conducted emissions increase with motor cable length, conformance
to EMC limits is only guaranteed with the specified ac supply filter option up to a maximum cable length as
specified in Appendix E: “Technical Specifications".
This maximum cable length can be improved using the specified external input or output filters.
Screened/armoured cable has significant capacitance between the conductors and screen, which increases
linearly with cable length (typically 200pF/m but varies with cable type and current rating).
