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All information contained herein is the exclusive copyright of Round Bank Engineering Ltd and is not to by copied,
duplicated or otherwise distributed without the express permission of Round Bank Engineering Ltd, Unit 7, Victoria
Business Park, Halifax, UK, HX1 5ND - +44 (0) 1422 647177
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Max Voltage
Maximum voltage cut-out setting. The of the supply voltage peaks above this value a Max Supply
Voltage Fault will stop the motor. Units are Volts x 10. For example 253 = 25.3V.
Note - Please be aware that this controller is four quadrant and IS FITTED with a Brake resistor. For
this reason it is critical that the voltage is not increased when the motor is running, as the brake
resister will be enabled and will lead to damaging the controller.
Start PWM
This value sets the PWM duty cycle sent to the motor during motor startup in units / 10. This is the
point where the acceleration of the motor starts from.
Bemf Sum
This value is set to 2500 as default and will run with this value every time the controller is powered
up
unless the “Save Bemf Sum” Tx button is pressed. Pressing the “Save Bemf Sum” Tx button
saves
the current value into EEPROM to allow a smoother start on the next power up.
This value can change drastically with various motors and windings. If there are issues starting
certain motors it may be because this initial value is too far away and the calibration can not home
in. In this case, it is possible to manually change the parameter.
Changing the PWM frequency will also drastically change this value. This is because as the PWM
frequency changes, the amount of PWM pulses during the Bemf window will also change. This
results in the controller stepping at inappropriate intervals and may require tuning by using either
the self-calibration, or manually changing the Bemf Sum.
