CDHD Drive Setup
User Manual 75
(line-to-line) . Filt ering the lines feeding t he m otor provides additional reduction
of noise currents that enter surrounding cables and equipment I/ O ports in close
proxim it y.
Loop each m ot or lead through t he core several tim es, as shown in Figur e 5- 4.
N e ver loop a ground lead t hrou gh a cor e .
Figur e 5 - 4 . Mode Line Filter ing
5 .3 .6 I / O Sign al Filt e ring
I/ O filtering may be desirable (depending on system installation, application, and
integration with other equipm ent). To avoid unwanted signals entering and
disturbing the drive system or other associated equipm ent, place ferrit e cores on
I / O lines.
5 .3 .7 Addit ional EMI Su ppr ession Re com m endations
Route power and control cables separately. A distance of at least 200 m m is
recom mended, and im proves the interference im munity.
I f input power and m otor leads need to cross, make sure they cross at 90° .
Feedback lines may not be extended, since this would cause the shielding to be
interrupted, and possibly disturb the signal processing.
Splice cables properly. If you need to divide cables, use connect ors with m etal
backshells. Make sure that both shells connect along the full 360° of the shields.
No portion of the cabling should be unshielded. Never divide a cable across a
terminal strip.
For differential inputs for analog signals, use twisted-pair, shielded signal lines,
connecting shields on both ends.
5 .4 Elect rica l System Con siderations
5 .4 .1 Fusing
Integral solid state short circuit protection does not provide branch circuit
protection. Branch circuit protection must be provided in accordance with the
National Electrical Code and any additional local codes, so fusing is required.
US f use s: Class RK5 or CC or J or T, 600 VAC 200 kA, t im e-delay. The fuse
must be UL and CSA listed; UR- recognized is not sufficient.
EU fu se s: Types gRL or gL, 400 V/ 500 V, time-delay.
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