ABB ACH550-01 User Manual page 170

Refer- Value
ence setting
COMM*
AI1
Reference handling. The control of the rotation direction is
configured for each control location (EXT1 and EXT2) using the
parameters in
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.
Par. 1003
DIRECTION =
FORWARD
158
AI reference scaling
COMM [%] * (AI [%] / 0,5 * REF2 MAX [%])
Fieldbus reference
correction coefficient
200%
100%
0%
Group 10: START/STOP/DIR. Fieldbus
*Direction determined by the sign of
COM.REF
Fieldbus
ref. 1/2
ACH550 User's Manual
0 50% 100%
Group 10: START/STOP/DIR
Resultant
REF1/2
Max. ref.
-100%
-163%
–[Max. ref.]
Serial communications
AI1 Input
signal
100%
163%