Manual Slider SFX
Page 17
2.16 X5 – Additional capacitor
When decelerating, a stepper motor acts as
a generator and supplies current back to the
power supply. This will temporarily cause
the supply voltage to increase significantly.
To prevent rising above 45VDC, an electro-
lytic capacitor can be connected to clamp
X5 in addition to the capacitor in the pow-
er supply. Especially when using large and powerfull motors and high supply voltages, an
additional capacitor is recommended.
Assignment on X5:
Pin 1
GND
Pin 2
+42V
Please note:
In most circumstances, the use of an additional, external capacitor is not necessary.
2.17 S1/S2/S3/S5 – Setup of motor current and step width
The stepping motor drivers support mi-
crostep operation. They produce a sinu-
soidal course of motor currents. The step
width can be set individually for each
motor with the left three DIP switches
according to the following table.
Beside the dividers that are common for
2-phase motors down to 1/16th (3,200
steps per revolution) it is also possible to use dividers 1/2.5th to 1/10th commonly used
with 5-phase motors (500, 1,000 and 2,000 steps per rev.).
Furthermore the right three DIP switches are used to set the phase current of the power
drivers in 0.25A steps. In addition, pin 17 can be used to activate a current reduction down
to 50% of the selected set value. See section 2.5 for details. If clock pulses are applied to
the board with current reduction activated, the onboard controller will automatically disab-
le the current reduction until all steps are processed.
Changes on the DIP switches are taken over within less than 1 second without rebooting
the board. Changes to the step width may result in a position error of up to 4 full steps, so
it is recommended to do a reference movement after changing this setting.
The axes are allocated to the switches as follows:
•
S1 – X axis
•
S2 – Y axis
•
S3 – Z axis
•
S5 – optional 4th axis
Summary of Contents for Slider SFX
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