Rockwell-automation GMLC Reference Manual Manual de usuario descargar pdf (Pagina 221)

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101

Publication GMLC-5.2 - November 1999

184 Control Setting Blocks

Use the Direct Drive Control block only on a physical master only axis, or

a servo axis when feedback is off (with feedback on, it has no effect). The

Direct Drive Control block automatically enables the selected axis by

activating the appropriate drive enable output before setting the servo

output to the commanded value. The 16-bit DAC on the motion controller

limits the effective resolution of the Direct Drive Control block to 305 µV

or 0.003%. In addition, the servo output limit (set by the Set Output Limit

function of the Motion Settings block) ultimately limits the actual servo

output voltage when using this block.

To deactivate the selected axis drive enable output, use a Feedback block

(selecting the Feedback Off Type). This zeros the servo output and

disables the drive enable output.

The Direct Drive Control block is most commonly used:

• to provide an independent programmable analog output

• to provide a speed reference for a non-servo drive

• for testing a servo drive.

Reset Fault

Use the Reset Fault block to clear

• All axis faults on a selected physical or virtual axis

• A selected fault status on a selected physical or virtual axis

• 1394 system faults

The Reset Fault function block resides on the Main Palette.

The Reset Fault block only removes the fault status. It does not perform

any other recovery (for example, re-enabling feedback).

ATTENTION:

Be sure to find and correct the cause of the

fault before clearing the fault status. Otherwise, the fault

recurs on program start-up.

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