SEW-Eurodrive IPOS plus - Set Direction of Rotation of the Motor P35; Set Counting Direction P951 for the SSI Absolute Encoder; Set Encoder Scaling P955; Set Position Offset P953

Manual – IPOSplus®
61
6
SSI absolute encoder (DIP)
Position Detection and Positioning
6.5.3 2. Set direction of rotation of the motor P35_
Move the drive in the positive direction (defined according to application) at low speed.
If the actual position P003 or H511 counts upwards, you do not have to change para-
meter P350 "Change direction of rotation" (use MOVITOOLS
®
MotionStudio or DBG11B
to display the actual position). Change P350 if the actual position counts downwards.
This adapts the counting direction of the motor encoder to suit the application.
6.5.4 3. Set counting direction P951 for the SSI absolute encoder
Move the drive in the positive direction (defined according to application) at low speed.
If the absolute encoder position (H509 ACTPOS. ABS) counts upwards, you do not have
to change parameter P951 "Counting direction". If the absolute encoder position counts
downwards, P951 must be inverted.
6.5.5 4. Set encoder scaling P955
This parameter is irrelevant unless there is a motor encoder (speed control) present.
The position information from the absolute encoder is multiplied by this value. The pa-
rameter is set so the travel information ratio between the motor encoder and the abso-
lute encoder is as close to "1" as possible.
First, set the parameter to 1. Note down the values of variables H509 (ACTPOS. ABS)
and H511 (ACTPOS. MOT). Move the drive by at least 1 motor revolution. Determine
the difference between the noted and the current values of the variables and calculate
the quotient.
The quotient Q results from the H511 difference divided by the H509 difference.
Q = (H511 old - H511 new)/(H509 old - H509 new)
Set ENCODER SCALING ( P955) to the value closest to the calculated quotient Q, pre-
ferably to the lower of the closest values.
If the quotient is greater than 80, positioning using the absolute encoder can only be per-
formed with reduced dynamic properties.
6.5.6 5. Set position offset P953
The position offset (P953) only has to be set on incremental encoders. For other enco-
ders, its should be set to 0.
Proceed as described for P953 in the chapter "IPOS Parameters".
ACTPOS. ABS H509 old H509 new H509 difference
Noted value
ACTPOS. MOT H511 old H511 new H511 difference
Noted value
INFORMATION
During project planning, ensure that the encoder ratio does not exceed 1:10.
P
i
f
kVA
Hz
n
P
i
f
kVA
Hz
n