User Manual

Table Of Contents
Connecting Power and Motors to the Controller
26 Advanced Digital Motor Controller User Manual V2.1, December 3, 2020
Important Warning
Do not rely on cutting power to the controller for it to turn Off if the Power Control
is left floating. If motors are spinning because the robot is pushed or because of
inertia, they will act as generators and will turn the controller On, possibly in an un-
safe state. ALWAYS ground the Power Control wire terminal to turn the controller Off
and keep it Off.
Important Warning
Unless you can ensure a steady voltage that is higher than 7V in all conditions, it is
recommended that the battery used to power the controller’s electronics be sepa-
rate from the one used to power the motors. This is because it is very likely that the
motor batteries will be subject to very large current loads which may cause the volt-
age to eventually dip below 7V as the batteries’ charge drops. The separate backup
power supply should be connected to the Power Control input.
Connecting the Motors
Refer to the datasheet for information on how to wire the motor(s) to a particular motor
controller model.
After connecting the motors, apply a minimal amount of power using the Roborun PC util-
ity with the controller configured in Open Loop speed mode. Verify that the motor spins
in the desired direction. Immediately stop and swap the motor wires if not.
In Closed Loop Speed or Position mode, beware that the motor polarity must match this
of the feedback. If it does not, the motors will runaway with no possibility to stop other
than switching Off the power. The polarity of the Motor or of the feedback device may
need to be changed.
Important Warning
Make sure that your motors have their wires isolated from the motor casing. Some
motors, particularly automotive parts, use only one wire, with the other connected
to the motor’s frame. If you are using this type of motor, make sure that it is mount-
ed on isolators and that its casing will not cause a short circuit with other motors
and circuits which may also be inadvertently connected to the same metal chassis.
Single Channel Operation
Dual channel Brushed DC controllers may be ordered with the -S (Single Channel) suffix.
The two channel outputs must be paralleled as shown in the datasheet so that they can
drive a single load with twice the power. To perform in this manner, the controller’s Power
Transistors that are switching in each channel must be perfectly synchronized. Without
this synchronization, the current will flow from one channel to the other and cause the
destruction of the controller.