Emerson P/N 400518-02 manual Following Error Group, Rotary Group, Online Tab, Motor Position Group

Setting Up Parameters

Or the In Position window is set to 0.001 inches. If at the end of an index, the following error is calculated to be 0.0015 inches, then the InPosn output will not activate.

In Position Time

This is the amount of time in seconds that commanded motion must be complete and the absolute value of the following error must be less than the In Position Window parameter for the InPosn output to activate. If set to zero (default), then the InPosn output will activate as soon as motion stops and the following error is less than the In Position Window parameter.

Following Error Group

Following Error Limit Enable Check Box

Select this check box to enable (or clear this check box to disable) the Following Error Limit. If enabled, a fault will be generated if the absolute value of the following error ever exceeds the value in the following error parameter. If disabled, a fault will never be generated.

Following Error Limit

Following Error is the difference between the Position Command and the Position Feedback. It is positive when the Position Command is greater than the Position Feedback. If the absolute value of the following error exceeds the value entered here, the drive will generate a Following Error Fault (F). All accumulated Following Error will be cleared when the drive is disabled.

The Following Error Limit is defined in user units.

Rotary Group

Rotary Rollover Enable Check Box

Select this check box to enable (or disable if check box is clear) the rotary rollover feature.

Rollover Position

This parameter is used in rotary applications and determines the position at which the internal position counter will be reset to zero.

Example:

The user has a rotary table application with distance user units of degrees, 360.00 degrees/1 rev. The Rotary Rollover would be set to a value of 360°.

The motor is traveling in the positive direction. As the feedback position reaches 359.999 and continues on, the feedback position will reset (or roll-over) to zero. If the motor changes direction and travels in the negative direction, the position will rollover at 0 to 359.999 degrees and count down. The resolution of the rotary rollover point is determined by the Distance Units Decimal Places parameter on the User Units view in the PowerTools Pro software.

If an absolute index is used with a non-zero rotary rollover point, the FM-3/4 module will calculate the shortest path to its destination and move in the required direction.

To force the motor to run a certain direction, use the Rotary Plus or Rotary Minus type of indexes.

Online Tab

While online with the device, the lower half of the view is the Online tab and the following real-time data will be displayed.

Motor Position Group

Position Command

This is the commanded position in user units generated by the device. This is set to zero when the Absolute Position Valid output function is activated. The Position Command is specified in user units.

Position Feedback

This is the feedback position of the motor. It is set to zero when the Absolute Position Valid output function is activated. Position Feedback is specified in user units.

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