Rockwell Automation 1756-DMF30 ControlLogix Drive Module - Manual (Page 173)

Publication 1756-UM522B-EN-P - February 2003
1756-DMD30 Specific Information B-93
751 Interp Spd Scale
A gain multiplier for the interpolator, whose product is output
parameter 750 [Interp Speed]. Normally it is set close to 1.0
to secure minimum following error. Default:
Min:
Max:
Type:
File:
Group: 1
0
200
Linkable, Read-Write, Floating Point
Position Control
Interp/Direct
753 Posit Offset 1
Suplies a position reference offset, which is summed after the
Electronic Gear Ratio and used to phase trim position
reference. A step in the offset position will be internally rate
limited and added to the selected reference position. The rate
of correction is set by parameter 755 [Posit Offset Spd]. The
initial value of this parameter is latched upon position enable
without causing a change in reference. Subsequent changes
to the value will be relative to the latched value. See
parameter 740 [Position Control] bit 5 for re-referencing the
offsets. Default:
Min:
Max:
Type:
File:
Group: 0
-2147483648
2147483648
Linkable, Read-Write, 32-bit Integer
Position Control, Position Control
Interp/Direct, Point to Point
754 Posit Offset 2
Suplies another position reference offset, which is summed
directly with parameter 753 [Positi Offset 1]. Used to trim the
phase of the selected position reference. Position offset will
be internally rate limited to a velocity set by parameter 755
[Posit Offset Spd]. Default:
Min:
Max:
Type:
File:
Group: 0
-2147483648
2147483648
Linkable, Read-Write, 32-bit Integer
Position Control, Position Control
Interp/Direct, Point to Point
755 Posit Offset Spd
Sets the speed of position offset. A position offset command
will not exceed this speed. The actual speed of offset is
limited to a maximum value of 1/(inertia * pos gain) so as not
to cause a torque pulse greater than 1 per unit. The speed will
change exponentially. Units:
Default:
Min:
Max:
Type:
File:
Group: RPM
175
-14000
14000
Linkable, Read-Write, Floating Point
Position Control, Position Control
Interp/Direct, Point to Point
756 X Offst SpdFilt
Displays the output of a first order filter whose time response
is shaped specifically to provide an output that represents the
actual speed of offset correction. It may be used as feed
forward into speed reference to secure minimal position error
during changes to offset. Units:
Default:
Min:
Max:
Type:
File:
Group: RPM
0
-14000
14000
Non-Linkable, Read Only, Floating Point
Position Control, Position Control
Interp/Direct, Point to Point
758 Pt-Pt Posit Ref
The point to point mode 32 bit position reference is selected by
parameter 742[Posit Ref Sel]. The initial value is latched upon
position enable without causing movement. Subsequent
changes to reference are relative to the latched position
unless the position is re-referenced by parameter 740 [Position
Control] bit 10. Position moves may be made within the limits
of plus or minus 31 bits. Point to point reference may also be
changed, even reversed, during a move. Default:
Min:
Max:
Type:
File:
Group: 0
-2147483648
2147483648
Linkable, Read-Write, 32-bit Integer
Position Control
Point to Point
No. Name
Description Values