Operating instructions

04/08 Application manual Positioning 21
3.5.2 Reference system
The reference system provides the link between the electrical system and the me-
chanical system. In parameter
Feed Constant 1115, the user units (u) per revolution
(U) are entered. By choosing a suitable parameter configuration, the feed constant
can consider both the mechanical motion distance and the accuracy (resolution) (see
example).
Via
Gear Box: Driving shaft revolutions 1116 and Gear Box: Motor shaft revolu-
tions
1117, it is possible to consider the transmission ratio of a gearbox.
The terms Gear Box: Driving shaft revolutions 1116 and Gear Box: Motor shaft
revolutions
1117 are used in compliance with CANopen Standard CiA402 Device
Profile Drives and Motion Control.
Parameter Settings
No. Description Min. Max. Fact. sett.
1115 Feed constant 1 u/U 2
31
-1 u/U 65536 u/U
1116
Gear Box: Driving shaft revolu-
tions
1 65 535 1
1117 Gear Box: Motor shaft revolutions 1 65 535 1
Maximum motion distance
The internal representation of position values is limited to ±2
31
-1 increments, re-
ferred to a resolution of 2
16
increments/revolution. The maximum motion distance
s
max
depends on the settings of parameters Feed Constant 1115, Gear Box: Driving
shaft revolutions
1116 and Gear Box: Motor shaft revolutions1117. At a higher
accuracy of the feed constant and gear factor, the maximum motion distance is re-
duced.
[]
()
[
]
1117
11161115
U
Ink
U
u
Ink
16
31
max
2
12
us
srevolution shaft Motor:Box Gear
srevolution shaftDriving :Box GearConstant Feed
⋅
⋅⋅−
±
=
Application manual Positioning 2104/08