User manual

Chapter 1 Introduction to the 2762-17

ADVANCED MICRO CONTROLS INC.

Transducer Setup Parameters (continued)

Linear Offset

The Linear Offset is a fixed number that is added to the transducer position data. It adjusts

the range of position values the 2762-17 uses. For example, a twenty inch expected travel is

over a range of 35.000 to 55.000 inches. Programming a linear offset of 35,000 will force the

position data to read from 35,000 to 55,000. The module can output positions between -99,999

and 999,999. Therefore the range of values for the linear offset is -99,999 to (999,999 - Full

Scale Count).

Preset Value

The Preset Value allows you to adjust the position data without rotating the transducer shaft.

It's most commonly used to set the position data equal to the actual position of the load. Once

programmed, the position can be set to the preset value from the keyboard or processor. The

programmable range of the Preset Value is Linear Offset to (Linear Offset + FSC).

Upper and Lower Travel Limits

In many applications, the machine will be damaged if the load exceeds the boundaries of

expected travel. The Upper and Lower Travel Limits are programmable boundaries that will

disable the motor outputs if the position exceeds them during a move profile. Once the position

exceeds these limits, the only way to move the load is by jogging the position. The upper travel

limit sets the upper boundary and is programmable from (Lower Travel Limit + 1) to (Linear

Offset + Full Scale Count). The lower travel limit sets the lower boundary and is

programmable from Linear Offset to (Upper Travel Limit -1).

Positioning Setup Parameters

Positioning setup for each channel consists of six parameters that define the positions at

which the motor control outputs change state. They can be programmed from the

keyboard or processor. Processor programming is disabled when the keyboard is in use.

Target Position

Target Position is the desired position of the load when a move profile is completed. It is

programmed as an absolute position within the Lower and Upper Travel Limits. Except for

Positioning Direction, the other parameters are programmed as absolute values relative to this

position.

The direction of approach to the Target Position is programmable. Therefore, the

definitions of the parameters refer to a positive side of the Target Position and a negative side

of the Target Position. The positive side refers to all values greater than the Target Position

and the negative side refer to all values less than the Target Position.

Positioning Direction

Positioning Direction defines the direction of the approach to the Target Position. A

Positive Approach forces an approach from the positive side of the Target Position. A Negative

Approach forces an approach from the negative side. If the starting position of the move

profile is on the opposite side of the Target Position, the 2762-17 will drive the load to the

correct side of the Target Position before completing the move profile.