Nord Drivesystems SK 200E Series User Manual

POSICON positioning control – Supplementary manual for series SK 200E and SK 250E-FDS
28 BU 0210 en-3117
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4.2.2 Position detection with absolute encoders
The absolute encoder transfers the actual position value to the frequency inverter in digital form. The
position is always completely available in the absolute encoder and is also correct after displacement
of the axis when the inverter is switched off. A reference point run is therefore not necessary.
If an absolute encoder is connected, the parameter P604 "Encoder Type" must be parameterised to
one of the absolute functions (Setting 1 or 5).
The resolution of the encoder is set in parameter P605.
If the absolute encoder is not mounted on the motor shaft the gear ratio between the motor and the
absolute encoder must be parameterised. The number of revolutions of the encoder are converted into
the number of motor revolutions in the frequency inverter with the aid of the parameters P607 "Speed
ratio" and P608 "Reduction ratio.
n
M
= n
G
* Ü
b
/ U
n
n
M
: Number of revolutions of motor
n
G:
: Number of revolutions of encoder
Ü
b
: Speed ratio
(P607 [-02])
U
n
: Reduction ratio
(P608 [-02])
Example
The encoder is installed on the output side of the gear unit. The gear unit has a speed ratio of i = 26.3.
The following values are parameterised:
P607 [-02] =
263
P608 [-02] =
10
Information
Rotation direction
The direction of rotation of the encoder must be the same as the direction of rotation of the motor. With a positive
output frequency (clockwise rotation) the actual position value must increase. If the direction of rotation is not
correct, this can be adjusted with a negative value in P607 "Speed Ratio".
With the aid of a value which can be parameterised in parameter P609 [-02]] "Offset Position" the zero
point can be set to a different position to that which is determined by the reference point. The offset is
applied after conversion of the encoder rotations to motor rotations. After changes to the speed
ratio/reduction ratio (P607 [-02] and P608 [-02]) the offset position value must be entered again.
Information
Maximum possible position
The maximum possible position in parameter P615 "Maximum Position" results from the resolution of the encoder
and the Speed Ratio/Reduction Ratio (P607 and P608). Under no circumstances can the maximum value exceed
+/- 65535 (16Bit) rotations.
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4.2.2.1 Supplementary settings – CANopen absolute encoders
The baud rate and the CAN address must be set on the encoder. For the assignment of the switches
on the encoder, please refer to the manufacturer´s operating instructions.
The CAN address for the absolute encoder should be set in parameter P515[-01] "CAN Address"
according to the following formula:
CAN address of absolute encoder = CAN address of frequency inverter (P515[-01]) + 1

Nord Drivesystems SK 200E Series Specifications

General

Brand	Nord Drivesystems
Model	SK 200E Series
Category	Inverter
Language	English