Typically motion control applications require the machine to be homed to a predefined starting position, prior to performing its normal operations. Generally, a mechanical home switch or a marker pulse is referenced (off an encoder) to provide the homing reference position.
A motor (with a resolver) drives a load through a 0.5 inch/rev lead screw.
To home the machine, the load is required to move at 30 in/min in the clockwise direction. This is in the direction toward a proximity switch (which will be used as the home switch). After the switch is triggered, the load continues to move in the same direction until a marker pulse is seen. In this case, the marker pulse is from the resolver (ResPos = 0). The motor then decelerates to a complete stop to a position beyond the marker pulse and then reverses direction back toward the marker pulse coming to rest at resolver position of ResPos = 10. The drive then activates an output to signal a PLC that the move is done. First calculate the speed of the motor while it’s advancing toward the home switch: Run Speed = 2 rev/in * 30 in/min = 60 rpm
Procedure
1. Create a New Configuration and select Position Mode - Predefined Moves as the mode of operation.
2. Click on Digital I/O Tab. Set up a Home Switch Input, a StartMove Input, and a MoveSelectBit. Set up a MoveDone output. 3. Click on the Predefined Moves tab. Setup a Home move using the following parameters: Move Type: Home Run Speed: 60 rpm
Brand display
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