RoboteQ AX2850 user manual Controller Power, Mended Off Configuration

Controller Power

				Mot1(-)
				Mot1(+)
Channel 1 MOSFET Power Stage			5Vmin	VBatt Vmot
			40V max	GND
				Power
		ENABLE		Control
Microcomputer &	9.5V min			&Backup
			10.5V min
MOSFET Drivers	13V max	DC/DC
			40V max	GND
Channel 2 MOSFET Power Stage			5Vmin	GND
			40V max	VBatt Vmot
				Mot2(+)
				Mot2(-)

FIGURE 9. Representation of the AX2550’s Internal Power Circuits

When powered only via the Power Control input, the controller will turn On but motors will not be able to turn until power is also present on the VMot wires

The Power Control input also serves as the Enable signal for the DC/DC converter. When floating or pulled to above 1V, the DC/DC converter is active and supplies the AX2550’s microcomputer and drivers, thus turning it On. When the Power Control input is pulled to Ground, the DC/DC converter is stopped and the controller is turned Off.

The yellow Power Control wire and the thin black wire MUST be connected to Ground to turn the Controller Off. For turning the controller On, even though the Power Control may be left floating, whenever possible pull it to an unfused12V or higher voltage to keep the controller logic solidly On. You may use a separate battery to keep the controller alive as the main Motor battery discharges.

The table below shows the state of the controller depending on the voltage applied to Power Control and Vmot.

TABLE 3. Controller Status depending on Power Control and VMot

Power Control input is	And Main Battery
connected to	Voltage is	Action
Ground	Any Voltage from 0V to 40V	Controller is Off
Floating	0V	Controller is Off. Not Recom-
		mended Off Configuration.
Floating	Between 8V and 10.5V	Controller Logic is On
		Power Stage is Disabled (under-
		voltage condition)
Floating	Between 10.5 and 40V	Controller is On.
		Power Stage is Active

AX2550 Motor Controller User’s Manual 31