KEB COMBIVERT F5-A Applications Manual page 347

ru.61: Target position
In this example, all position setpoint in PS.24 are positive. The position values 0 and PS.39 are identical, there-
fore, the value 0 as well as the value PS.39 can be displayed during traversal of the round table range.
Thereby, apparent jumps can occur in the position values if the display changes between the value 0 and
PS.39.
Rotary table / flying referencing
If only one encoder is used, the gear can cause a further problem:
If the gear factor x increments per revolution does not result in an integer value, the value for PS.39 cannot be
set exactly.
Example:
The gear ratio between motor and rotary table is 50 : 3
encoder increments per revolution = 2500 and multiple evaluation = 2: 4-fold
50
PS.39 =
——
3
In PS.39, however, only integer values can be entered. Thereby, one obtains (for predominant motion in one
direction of rotation) an error that increases with each round table revolution.
To correct this error, there is the possibility of flying referencing for round table applications.
© KEB, 2012-10 COMBIVERT F5-A, -E, -H
Posi- and synchronous operating
ru.02: ramp output display (setpoint speed controller)
x encoder increments per revolution
multiple evaluation
x 2 =
ru.56: Set position
50
x 10.000 = 16.666,6666
——
3
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