Connecting Power and Enabling Motor Power

The Guidance 1000 Controller, motor power supply and 24VDC logic power supply should be connected as shown below. The 24V power supply is wired to a two pin 24VDC Logic Power Connector on the front panel. This connector provides power to the controller's high performance processor and the other logic circuits. The motor power supply is wired to an eight pin Motor Power Input Connector that includes other signals as well. When enabled, this source provides power to the motors connected to the motor amplifiers.

Figure 34-59: Connector and Connections



The Guidance 1000 is powered by 24VDC and can contain voltages up to 42VDC to drive the motors. These products are intended to be mounted in a cabinet or machine chassis that is not accessible or to have its top cover installed when AC line power is on.

For the motors to be provided with power, the following conditions must all be satisfied:

Power must be supplied to the Motor Power Input Connector.
The Motor Power Input Connector's "Amplifier Enable+" signal must be tied to 24VDC and the "Amplifier Enable-" signal must be tied to ground.
The controller must internally enable the amplifiers.

Since this controller only supports low motor voltages, there are several ways in which power can be safely enabled:

The motor power supply output can be left powered on and the controller's internal logic can enable and disable power to the amplifiers as needed.
If the IO Daughter Board is installed, the Motor Power Enable signals from the RS-485 / Motor Power Enable connector can control a relay that turns the motor power supply on and off.
If the IO Daughter Board is installed, the Motor Power Enable signals from the RS-485 / Motor Power Enable connector can control a relay that sets the Amplifier Enable+/- signals to their required states.

If the Amplifier Enable+/- signals are not controlled by a relay, they should be hardwired to the 24VDC and ground signals to permit motor power to be enabled.

NOTE: Even if the motors are energized by a 24VDC power supply, the motor power supply be separate from the 24VDC logic power supply.

When motors decelerate, they can regenerate significant power that flows back to the motor power supply. If the motor power supply is not designed to absorb this regenerated energy, the voltage of the motor supply can rise significantly. If this power supply is also connected to the controller's digital logic, the pumped up voltage will damage the controller.



If the voltage supplied to the controller's digital logic exceeds 30VDC, the controller's hardware will be damaged. Motor power supply voltage pump-up from decelerating motors can significantly exceed this limit so the motor supply should not be connected to the controller's logicunless the supply is specifically designed to absorb this energy and limit the voltage rise.