Function library
7-34
L
EDSVS9332P-D21 EN 3.0
Example (refers to the preceding safety information):
With a quadruple evaluation of a position encoder with 1024 increments 4096 increments are
available. The angle of rotation of the motor shaft per encoder increment:
360°
4096
incr
= 0.0879 ° = 0° 5.3′ (5.3
angular minutes
)
Ratio of the position encoder e.g. i = 128:
0.0879° × 128 = 11.25° = 11° 15′ (11 ° and 15
angular minutes
)
The motor should rotate by 11° to compensate an offset of one increment. A further increase of the
ratio would raise the ”compensating path” of the motor.
Permanent slipping of a friction wheel running on the material web (= drive of the position encoder)
results in a faulty actual position value. A web break could accelerate the drive to high speeds due
to the missing actual position value.
Example:
The spindle drive mentioned in the previous example is driven with a separate position encoder
connected to the spindle (gearbox output side).
Settings as described under machine parameter but:
C1206 Polarity of position setpoint -0-: Not inverse
-1-: Inverse
Reversal of traversing direction
C1207/1 Position encoder gearbox factor, numera tor 32 Numerator according to motor speed
C1207/2 Position encoder gearbox factor,
denominator
1 Denomina tor according to encoder speed
C1208 Polarity actual position -0-: Not inverse
-1-: Inverse
If “inverse” is selected, observe the QSP function notes.
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