by cncdrive » Sat Mar 31, 2018 3:17 pm
It's impossible for me to tell if the mistaken connection made damage to the breaking circuit or not, but if you did not see smoke then probably not.
You can also test the card if it is still working or not.
First connect it properly to the PSU and power it up and the LED should remain off. If the LED is on when nothing else is connected and if the voltage is below 180Volts then the card is damaged, then switch it off to avoid overheating of the breaking resistors.
It the LED is off then it is fine, then you can try to trigger it with shorting out those 2 THT resistors on the board, that will move the reference point for the voltage comparator to 0Volts and then the LED should light up and the breaking resistors are energised. Do not leave them shorted out, because it can overheat the resistors, just test it for a few seconds or so.
And be very careful what you touching, because depending on your PSU voltage levels there can be dangerous voltage levels which could harm you!
And if one braking circuit is enough or not depends on many factors, the power of the motor, the size of the load, the decceleration rate and frequency etc.
Basicly it depends on how much energy needed to be dissipated by the circuit.
The larger the motors the higher the load the more rapid the deccelerations the more they will enerise and the more the resistors will heat.
You should verify it in the application with testruns if the resistors heat up too much or not on the long runs.
If they do then you can any time install more breaking circuits in parallel, because they will share the dissipation.