maxon EC motor
15
maxon motor
Operating Instructions
EC 20 flat with integrated electronics
September 2010 Edition / document number 903155_PDF_E - 07 / subject to change
7 Installation instructions
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Max. torque of flange screws is 0.3 Nm (screw strength category 8.8).
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Cooling improvement through mounting a large metallic part.
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Cable outlet preferably downwards.
8 EMC compliant installation
8.1 Cable length <
_ 300 mm
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Normally no shielding is required.
–
Star wiring recomended if several EC 20 flat with integrated electronics
are supplied by a common supply voltage.
8.2 Cable length > 300 mm
–
The voltage drop in the connection cable must be minimised by choosing
a large enough wire cross section.
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The use of shielded cables connected to ground can improve immunity
against interference in electromagnetically harsh environments.
–
Release cable shielding on one side if 50/60 Hz interference problems
occur.
–
The irradiance surface for interference can be reduced by shortening the
unshielded original connection cable.
–
Immunity against interference and speed stability when loads fluctua-
te can be achieved by routing the set speed value signal separately in
a shielded cable that is put to ground both sides. In addition to the set
speed value signal, a second ground (GND) line must also be carried in
this separate cable, but only connected on the motor side. The external
set value speed signal must be potential-free.
