ABB ACS550-02 User Manual page 164

162
References
References are 16-bit words comprised 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.
Reference 1. The contents of the register address 40002
as the frequency reference,
• Use 1102
and
• 1103
For scaling with positive values: +20000 in holding register 40002 equals the value
of parameter 1105 REF1 MAX, and zero in holding register 40002 equals a zero
value for ref 1. The diagrams below show both positive and negative value
situations. 1104 REF1 Min is not used.
P 1105
(
MAX
Reference 2. The contents of the register address 40003
as the frequency reference
• Use 1102
and
• 1106
For scaling with positive values: +10000 in holding register 40003 equals the value
of parameter 1108 REF2 MAX, and zero in holding register 40003 equals a zero
value for ref 2. The diagrams below show both positive and negative value
situations. 1107 REF2 Min is not used.
P 1108
(
MAX
Actual Values
The contents of the register addresses 40005...40012 are
• Specified using parameters 5310...5317.
Start-Up
REF
1/ 2 to identify the control input that selects between
EXT EXT SEL
2. Then that control input must select
EXT
1 = 8 ( ), 9 (
REF SEL COMM
Ext ref
)
40002
Value
0
0 20000
Positive values
REF
1/ 2 to identify the control input that selects between
EXT EXT SEL
2. Then that control input must select
EXT
2 = 8 ( ), 9 (
REF SEL COMM
Ext ref
)
40003
Value
0
0 10000
Positive values
1. The required parameter settings are:
1.
EXT
+ 1), or 10 (
COMM AI
Value
40002
OR
2. The required parameter settings are:
2.
EXT
+ 1), or 10 (
COMM AI
Value
40003
OR
1 can be used
REFERENCE
* ).
COMM AI
Negative values
-20000 0
0
( )
MAX
P 1105
Ext ref
2 can be used
REFERENCE
* ).
COMM AI
Negative values
-10000 0
0
( )
MAX
P 1108
Ext ref
and are:
ACTUAL VALUES
1
EXT
1
EXT