MECHAPRO 3D-Step Assembly Information

Assembly Information
Stepper Motor Card >3D-Step<
Rev. 2.8 (last updated 5.1.2013)
Functional Desciption
The 3D-Step controller card enables the operation of 3 (optionally 4) stepper motors via
the parallel port of a standard PC. The phase current of the stepper motors can be raised
(boost) or reduced (sleep) by approx. 25% depending on the operating mode. In addition
four reference switches and one e-stop switch can be connected and looped right through
to the PC. The e-stop switch when activated will also cut off the L298 output driver ICs.
Several LEDs visualize the actual operating mode and the status of the reference switches.
Exclusion of Liability, EMC (electromagnetic compatibility)
Although all parts of the circuitry have been thoroughly tested mechapro does not give
any warranty or other assurance as to the operation or functionality of the circuitry or the
documentation. mechapro especially takes no responsibility for any damages caused by
reproduction, reverse engineering or initial operation of the here described circuits.
The stepping motor power amplifier "3D-Step" is an OEM product made for use in indus-
try, electronic trade and other EMC experienced sectors. According to EMVG §5, section 5
this product does not require CE qualification.
Cabling, used amplifiers, power supply and the surrounding environment are factors that
influence the EMC properties of a device. A device using one or more stepper motor po-
wer amplifiers must of course be evaluated according to corresponding directives, when
CE conformity must be documented. During development all possible means were used to
conform to EMC regulations.
Fitting with components
When fitting the board with components, make sure to follow the general rules:
• Start with the small components (resistors, diodes, capacitors, ...)
• Be careful to assemble with correct polarity (diodes, electrolytic caps, resistor arrays, ...)
• For the diodes D1 ... D24 only fast switching diodes of the types BYV27, BYV28, BYW98
that can stand at least 100 V should be used.
• All ICs (except for LM2574N) should be set on sockets for safety reasons. For the L298s
single line sockets (high 8-8.5 mm) can be used. Cut the sockets to the length required.
Make sure both socket rows are aligned in the same direction. Do not use precision sockets
with turned contacts.
• The heat sink (type V6717Z, or SK96/84 -> only 84 mm wide) has fitted threads. Before
plugging in the L298's, screw the heat sink with the plastic spacers onto the board, then
align the ICs and screw them into the heat sink.
• Before final mounting of the L298's it is recommended to apply a thin(!) layer of heat
conducting paste to the ICs, to achive good heat dissipation. No isolating material required
between heatsink and L298.
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