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3.2.3.1
Recommendations for Motor Wiring
a) Avoid running the motor wires in parallel with other wires for a distance longer than 2 meters. If
this situation cannot be avoided, use a shielded cable for the motor wires. Connect the cable
shield to the IDMx40 earth/shield pin. Leave the other end disconnected.
b) The parasitic capacitance between the motor wires must not bypass 100nF. If very long cables
(hundreds of meters) are used, this condition may not be met. In this case, add series
inductors between the IDMx40 outputs and the cable. The inductors must be magnetically
shielded (toroidal, for example), and must be rated for the motor surge current. Typically the
necessary values are around 100 μH.
c) A good shielding can be obtained if the motor wires are running inside a metallic cable guide.
3.2.3.2
Recommendations for Power Supply On-Off Switch and Wiring
a) If motor supply V
MOT
values that can damage the drive. In order to limit the in-rush current, it is preferable to use
the inherent soft-start provided by the power supplies when are turned on. Therefore, it is
recommended to locate the switch for the motor supply at the INPUT of the power supply (see
Figure 3.14) and NOT at the output i.e. between the supply and drive.
Figure 3.14. J2 – Motor supply connection – Recommended in-rush current limitation
b) When the above solution is not possible (as in the case of uninterruptible power supplies, or
batteries/accumulators), connect an external capacitor of minimum 470µF between the switch
and the drive, to reduce the slew-rate rising slope of the motor supply voltage.
Figure 3.15. J2 – Motor supply connection – Alternative in-rush current limitation
© Technosoft 2011
is switched on abruptly, the in-rush (start-up) current can reach very high
IDMx40
IDMx40
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IDMx40 Technical Reference
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