Emerson FM-3 manual How Motion Works, How Jogging Works

Operational Overview

each group and returns to that screen when you come back to the group. This is reset on power-up and the FM-3 keypad displays the first Parameter screen in the group.

In this screen, the parameter name is shown on the first line of the display. The up/down arrow keys are used to scroll through the parameters available in the selected group.The second line displays the condition or value of parameters. The third line displays the soft key actions.

The left/right arrow keys are used to scroll through the parameters when the “<“ and “>” symbols are shown.

Numeric parameter units are sometimes shown before the actual value, because the parameter value and the units cannot be displayed on one line. The unit of measure will appear on the second line for about one second. Then the actual parameter value will appear. The parameter value is updated about five times a second.

How Motion Works

The FM-3 module provides four types of motion: jogging, homing, indexing, and gearing. Only one index, jog, home, or gear may be in process at any given moment (exclusionary motion types). Through assignments and programs, the FM-3 module can sequentially run various motion routines. The Positive direction parameter affects all motion types by specifying which direction of motor revolution (CW or CCW) is considered motion in the “+” direction.

How Jogging Works

Jogging produces rotation of the motor at controlled velocities in a positive or negative direction.

Assignments to jogs are level sensitive such that when the jog input is turned on, jogging begins and continues jogging until the jog input is removed.

Each jog has its own acceleration and deceleration ramp along with a specified velocity. Jogging has no distance parameter associated with it. If trying to move a specific distance or to a known position, then an index is used.

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