ABB ACH550-01 User Manual page 173

ACH550 User's Manual
Speed Reference.The Speed Reference is a 16-bit word
comprising of a sign bit and a 15-bit integer. A negative
reference (indicating reversed rotation direction) is indicated by
the two's complement of the corresponding positive reference
value. The scaling of the Speed Reference is fieldbus type
specific. Refer to the fieldbus user's manual for a detailed
description of the scaling of the Speed Reference.
The use of REF2 is not supported by the Generic Drive Profile.
Reference scaling. The scaling of the Speed Reference is
fieldbus type specific. However, the relation of 100% reference
towards the drive is fixed as described in the table below. Refer
to the fieldbus user's manual for a detailed description of the
range and scaling of the Speed Reference.
Reference Range
REF Fieldbus
specific
Actual Values. Actual Values are 16-bit words containing
information on selected operations of the drive. The mapping of
the actual values is realized with the parameters in
EXT COMM
fieldbus controller as Actual Values depends on the selected
drive parameter. Refer to chapter
descriptions.
Serial communications
Reference
type
Speed -100% = -[par. 9908]
+100 = [par. 9908]
Frequency -100% = -[par. 9907]
+100 = [par. 9907]
MODULE. The scaling of the integers sent to the
Scaling
Final reference
0 = 0 limited by
1104/1105. Actual
motor speed
limited by 2001/
2002 [speed].
Final reference
0 = 0 limited by
1104/1105. Actual
motor speed
limited by 2007/
2008 [frequency].
Parameter listing and
Remarks
Group 51:
161