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Low - move until the specified
input is at a low voltage state. |
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If you need the load to be at the
exact same position after each Seek Home command, choose Rising Edge or
Falling Edge. |
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Rising Edge - move until the
signal goes from low to high. This is similar to the high condition, but
the difference is important. If you execute a Seek Home command to a
high input and the load is already on the home sensor (causing the input
to be high) then the load will not move. If you choose "rising
edge" instead, the PSMCC will move the load to the edge of the home
sensor. |
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Falling Edge - the opposite of
rising edge. PSMCC waits for an input voltage to go high, then low. The
PSMCC begins a Seek Home command by moving the motor in the direction
you have specified. If the home sensor is found, the motor decelerates
to a stop, then backs up to the sensor. If a limit is encountered before
the home sensor is found, the PSMCCreverses the direction of motion and
keeps looking for the home sensor. |
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You may have noticed a box in the
lower right-hand corner of the Seek Home dialog box. This tells you how
many steps the PSMCC needs to decelerate to a stop. The "Required
Clearance" box tells you how much distance you must allow between
the limit sensors and any hard stop, based on the speed and decel rate
that you've set. If you don't allow enough clearance, the load may crash
into something as it decelerates past a limit while seeking home. |
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The higher the speed, the longer it
will take to stop. If the decel rate is increased, then the motor can
stop in fewer steps. |
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Click
here to return to programming toolbox page |
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