Mc60 controller ac input to dc input

Question

Mc60 motor controller has 120 vac to dc and want it dc to dc

Answer 1

The MC60 motor controller is designed to be powered from 120 VAC. Inside the controller, the AC input is immediately passed through a bridge rectifier and filter capacitors, which convert the 120 VAC into approximately 160–170 VDC. This high-voltage DC is what actually drives the motor through the controller’s SCR/PWM circuitry.

Because of this design, the MC60 is not a true DC-to-DC controller. It does not boost voltage, and it cannot operate from low-voltage DC sources.

If you want to power the MC60 using DC instead of AC, you must supply a high-voltage DC source (around 160–170 VDC) directly to the AC input terminals. This works because the controller only “cares” about the DC bus voltage after rectification. The polarity must be correct, and the DC source must be well-filtered, since AC normally provides natural ripple that the controller expects.

Using a lower DC voltage (such as 24 V, 48 V, or 90 V DC) will not work properly because the controller was designed to regulate motor speed by chopping a high-voltage DC bus. Without that voltage, the controller cannot reach operating thresholds, and the motor will either run weakly or not at all.

In summary, the MC60 converts AC to high-voltage DC internally, so it can only accept DC that matches this internal voltage level. Converting the MC60 to a true DC-to-DC controller is impractical, and for low-voltage DC systems, a purpose-built DC motor controller should be used instead.