ABB ACQ810, Firmware Manual

Page: 344 / 376

344 Control through the embedded fieldbus interface
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References for the ABB Drives profiles
The ABB Drives profiles support the use of two Fieldbus references, REF1 and
REF2. The references are 16-bit words each containing a sign bit and a 15-bit
integer. A negative reference is formed by calculating the two’s complement from the
corresponding positive reference.
The fieldbus references are scaled before they are written into signals 02.38 EFB
main ref1 or 02.39 EFB main ref2 for the use in the drive. Parameters 50.04 FBA ref1
modesel and 50.05 FBA ref2 modesel define the scaling and possible use of the
fieldbus reference REF1 and REF2 as follows:
• If you select value Speed , the fieldbus reference can be used as a speed
reference and it is scaled as follows:
• If you select value Raw data , the fieldbus reference is scaled as shown in the
table below.
Fieldbus reference REF1 or REF2
[integer]
Corresponding speed reference
in the drive [rpm]
20 000 value of parameter 19.01 Speed scaling
0 0
-20 000 -(value of parameter 19.01 Speed scaling )
Fieldbus reference REF1 or REF2
[integer]
Corresponding reference
in the drive [rpm]
32 767 k × 0.5
(k = value of parameter 58.11 )
0 0
-32 768 k × -0.5
(k = value of parameter 58.11 )