Parker AC890 Product Manual page 329

Frame g, h & j

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Parameter Descriptions

ENCODER TYPE

This parameter defines the type of encoder being used.

Enumerated Value : Type

Note that if an absolute endat encoder is used, the encoder MUST be wired exactly as specified. If not, it will fail to calibrate

the absolute position and an error will result when the drive is started. Its status can be viewed via the parameter CALIBRATN

PMAC motor control needs to work with an absolute position. Using absolute encoders is preferred but using relative encoder

is possible with heavy constraints:

- at each power up, an init sequence is needed to align the Zero encoder position to the motor Back EMF. For this

purpose, the motor should be free of rotation, without any load or friction on its shaft.

As described, absolute encoders are :

- single turn or multi turn endat encoder

0 : QUADRATURE

1 : CLOCK/DIR

3 : QUADRATURE DIFF

4 : CLOCK/DIR DIFF

5 : CLOCK DIFF

6 : SINCOS INC

7 : ABS ENDAT ST

8 : ABS ENDAT MT

9 : RESOLVER

single-ended pulse encoder

differential pulse encoder

sin/cos encoder

single turn endat absolute encoder

multi-turn endat absolute encoder

absolute encoder

Range: See below

890SD Standalone Drive - Frames G, H & J

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