Emerson Control Techniques FM-4 Reference Manual page 131

Programming module
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'Analog' or 'Sensor' Radio Buttons
Select one of these radio buttons to determine what signal will be used as your registration trigger.
If 'Sensor' is selected, a source must be assigned to the Index.#.SensorTrigger. Typically a proximity sensor is wired to a
hardware input, and therefore a module or drive input source is assigned to the Index.#.SensorTrigger, but any source can be
used.
If 'Analog' is selected, one of the analog signals must be selected in the analog list box. Available selections are Analog In,
Torque Command, or Torque Feedback. Then a comparison operator must be selected from the operator list box. Available
selections are > (greater than) and < (less than). Last, an analog value must be entered for comparison.
Registration to Analog Input Value
If Analog In is selected from the list bo x, the value of the drive Analog Input is used as the registration signal. When the value
of the analog input reaches a value that satisfies the comparison operator, the sensor trigger will activate. Units for the
registration value will match the units configured on the Analog Inputs view when Analog In selected.
Registration Offset
The incremental distance the motor will travel after a valid registration sensor or analog limit value has been detected. This
is a signed parameter; so if an index is travelling in the negative direction, the offset needs to be negative and continue in the
same direction. If the registration offset is zero or less than the decel distance shown on the calculations tab, the motor will
decelerate at the programmed rate and then back up to the specified offset distance from the trigger position.
Enable Registration Window
This check box enables (if checked) the Registration Sensor Valid Window. When active, only registration marks that occur
inside the registration window are seen as valid.
Window Start
This parameter defines the start of the Registration Sensor Valid Window relative to start position of this index. This is an
unsigned value and is relative only to starting position of this index. Index direction does not affect this parameter. The
Registration Window Start position (or distance) should be less than the Registration Window End position. If a registration
sensor is seen outside of this window (not between the WindowStart and WindowEnd positions) then it will be ignored.
Window End
This parameter defines the end of the Registration Sensor Valid Window relative to start position of this index. This is an
unsigned value and is relative only to starting position of this index. Index direction does not affect this parameter. The
Registration Window End position (or distance) should be greater than the Registration Window Start position. If a
registration sensor is seen outside of this window (not between the WindowStart and WindowEnd positions) then it will be
ignored.
Example:
Index 0 is defined as a Registration type of index. The user wants the index to run at velocity for 10 Revs, or until the Torque
Feedback reaches 50% continuous torque and then continue for another 0.5 Revs.
In the Limit Distance parameter, enter 10.0
On the registration tab, select the Analog radio button.
In the analog list box, select Torque Command
In the comparison operator list box, select ">"
In the analog value parameter, enter 50 (Units are established on the User Units view)
In the Registration Offset parameter, enter 1.5
This index would accelerate up to its' target velocity, and run at speed until one of the following:
The Limit Distance is approaching, and the index decels down to zero velocity, completing the move at the Limit Distance.
At this point, the Index.#.LimitDistHit source would activate. Or,
The Torque Command reaches or exceeds 50% continuous, and the index continues at speed before decelerating to zero
velocity at the registration point plus the Registration Offset distance.
If the Registration Offset distance is in the opposite direction from the move, or is so short that the motor cannot stop in the
specified distance at the programmed deceleration rate, the motor will decelerate with the programmed ramp, and then back-
up to the specified position (registration point + the Registration Offset).
Setting Up Parameters
117

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