User Manual

MCP Series
Brushed DC Motor Controllers
MCP Series User Manual
41
1.7.5 Voltage Clamp Setup and Testing
The circuits shown will need to be modied for each application to make sure it properly
dissipates the regenerative voltages. Testing should consist of running the motor up to 25% of
its speed and then quickly slowing down without braking or E-Stop while checking the voltage
spike generated. Repeat, increasing the speed and power by 5% each time and checking the
voltage spike again. Repeat this process until 100% power is achieved or excessive over voltage
is detected. If over voltages are not clamped within requirements, either a lower Ohm resistor
will be required or additional DC Link capacitance will need to be added across B+ and B-.
Adding additional DC Link capacitance increases the amount of time the power resistor will have
to dissipate the regenerated power.