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158
Serial communications
ACH550 User's Manual
Reference handling.
The control of the rotation direction is
configured for each control location (EXT1 and EXT2) using the
parameters in
. Fieldbus
references are bipolar, i.e. they can be negative or positive. The
following diagrams illustrate how
parameters and the sign of the fieldbus reference interact to
produce the reference REF1/REF2.
COMM*
AI1
COMM [%] * (AI [%] / 0,5 * REF2 MAX [%])
*Direction determined by the sign of
COM.REF
Par. 1003
DIRECTION =
FORWARD
Refer-
ence
Value
setting
AI reference scaling
200%
0
AI1 Input
Fieldbus reference
correction coefficient
0%
100%
50%
100%
signal
Fieldbus
-163%
Max. ref.
–[Max. ref.]
-100%
100%
ref. 1/2
Resultant
REF1/2
163%
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