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FC MOVE
EXPLAINED: |
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FC Move is sometimes called a "blended" or
"high-speed/creep" move. It is fully defined as "Feed to
Length, with Speed Change", |
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that will accelerate up
to a certain speed, and continue at that velocity until it reaches the
"DC" (Distance Change) value, |
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where it will decel to
the VC (Velocity Change) value and continue until it nears the end of the
move, and will |
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decel and stop when it
reaches the DI (Distance) value, which is the overall move length. |
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| If
the DC value is too close to the DI ( Overall length of the move) for the
particular DE (Decel) value, then the drive will not try to go to the lower
speed, |
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it will just decel so it
stops at the DI value. |
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| Imagine
you are in a car moving toward a brick wall. You may want to stay at your
high-speed move, then go to a lower speed, and hold that lower speed for
a |
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certain distance before
you stop. |
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you apply the brakes at a point too close to the wall, you won't be able to
reach that lower speed and stay at it, and THEN do your final stop. You would
have to |
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slam on your brakes and
just decel to a stop. The drive tries to maintain the overall move distance
(DI) at the expense of the lower velocity setting. |
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will simply need to decrease the DC value ( so there is a larger distance
between DC and DI ) and/or try setting a higher DE value. |
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| Remember,
the drive is an open-loop stepper system. Just because you put in a value
doesn't mean the drive/motor can achieve your desired move. |
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| MD |
"Motor
Disable", always do this when changing Command Mode settings. |
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"MD" |
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| CM21 |
"Command Mode
21", makes sure the drive is set to Point-to-Point positioning mode. |
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"CM21" |
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| AC |
"Accel", sets
the accel, which will apply to the starting ramp. Both Accel and Decel are
independently adjustable, if desired. |
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"AC2" |
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| DE |
"Decel", sets
the decel, which would apply to both changes decel ramps. |
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"DC2" |
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| VE |
"Velocity",
sets the peak velocity of the move. |
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"VE3" |
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| EG |
"Electronic
Gearing", sets pulses per rev |
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"EG1000" |
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| ME |
"Motor Enable",
enables the motor for motion |
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"ME" |
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| DI |
"Distance",
this is the overall move distance |
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"DI90000" |
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| DC |
"Distance
Change", this is the point during the move at which the velocity will
change. |
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"DC60000" |
| VC |
"Velocity
Change", this is the second velocity (typically lower than VE) which the
drive will go to after it reaches the DC length. |
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"VC0.5" |
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| SA |
Saves parameters in
drive. |
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"SA" |
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| FC |
Initiates the move.
After the other settings are loaded to the drive, this is the only command
required for the drive to make the move. |
"FC" |
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