References - ABB ACS 400 User Manual

References

References are 16-bit words comprising a sign bit and a 15-bit integer. A negative reference
(indicating reversed direction of rotation) is formed by calculating the two's complement from the
corresponding positive reference value.
Reference 1
Holding Register: 40002
Reference 1 can be used as the frequency reference
external reference 1 (
activated. Refer to parameters 1103
Reference 2
Holding Register: 40003
Reference 2 can be used as the frequency reference
external reference 2
activated. Refer to parameters 1106
Fieldbus Reference Scaling
Fieldbus references are scaled as follows:
Reference 1: 20000
MIN is not used.
Reference 2: 10000
MIN is not used.
Fieldbus Reference
Fieldbus reference is selected by setting a reference selection parameter – 1103 EXT REF1
SELECT or 1106 EXT REF2 SELECT – to COMM, COMM+AI1 or COMM*AI1. The latter two
enable correction of the fieldbus reference using analogue input AI1. The following table explains
these selections. Note that the analogue input value is a percentage value (0-100 %) which can be
seen in parameter 0118 AI1.
Table 30 Correcting the fieldbus reference through analogue input.
Parameter Setting Effect of AI1 Value on Fieldbus Reference
None
COMM
+ 1 Corrected fieldbus reference = given fieldbus reference + analogue input AI1 value
COMM AI
* 1 Corrected fieldbus reference = given fieldbus reference * analogue input AI1 value / 100
COMM AI
130
1) must be set to
REF
EXT REF
2 must be set to
REF COMM
EXT REF
EXT REF1 MAX (Hz, parameter 1105). Scaling Parameter 1104 EXT REF1
EXT REF2 MAX (%, parameter 1108). Scaling Parameter 1107 EXT REF2
1 for the ACS 400. The signal source of
REF
and external control location 1 (
COMM
1 and 1102
SELECT
2 for the ACS 400. The signal source of
REF
and External control location 2 (
2 and 1102
SELECT
1) must be
EXT
1/ 2 .
EXT EXT SEL
2) must be
EXT
1/ 2 .
EXT EXT SEL
ACS 400 User's Manual