maxon EC motor
14 Document ID:: rel8710 EC-i30 IE
Edition: March 2019 Operating Manual
© 2019 maxon motor. Subject to change without prior notice.
3.1.3 Version Direction Preselection: Control Input «Direction»
The motor’s rotational direction is set with digital input «Direction». The input is protected against over-
voltage up to the maximum operating voltage.
Figure 12 «Direction» – Input circuitry
The activation of the power stage is solely dependent on the setpoint voltage «Set value speed». Upon
reversal of the direction with a rotating motor shaft, the internal set value is decreased by a preset ramp
until the minimal speed is reached. The power stage is briefly deactivated until the motor shaft acceler-
ates (with the set ramp) in the newly commanded direction up to the preset speed.
Table 3 «Direction» – Setpoint range
Pin assignment Connection wire «Direction», grey
Input voltage range 0…+3.3 V (referenced to GND)
Input impedance
130 kΩ (in range of 0…+4.4 V)
10 kΩ (in range of +4.4 V…+V
IN
)
Continuous overvoltage protection −30…+30 V
Set Value Function Remarks
0.0…1.1 V CCW Motor shaft turns counterclockwise
2.1…3.3 V CW Motor shaft turns clockwise
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