ABB Relion 670 Series Applications Manual page 109
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Also See for Relion 670 Series:
- Technical manual (1432 pages) ,
- Technical reference manual (1232 pages) ,
- Applications manual (944 pages)
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1MRK 511 401-UUS F
•
CFG-2 frame: The field ANUNIT (4 bytes) specifies the conversion factor as a signed 24 bit
word for user defined scaling. Since it is a 24 bit integer, in order to support the floating point
scale factor, the scale factor itself is multiplied in 10, so that a minimum of 0.1 scale factor can
be sent over the CFG-2 frame. The resulting scale factor is rounded to the nearest decimal
value. The clients receiving the Analog scale factor over CFG-2 should divide the received scale
factor by 10 and then apply it to the corresponding analog data value.
•
CFG-3 frame: The field ANSCALE (8 bytes) specifies the conversion factor as X' = M * X + B
where; M is magnitude scaling in 32 bit floating point (first 4 bytes) and B is the offset in 32
bit floating point (last 4 bytes).
The server uses CFG-3 scale factor to scale the analog data values. As a result, the clients which
use scale factors in CFG-3 in order to recalculate analog values, will get a better resolution than
using the scale factors in CFG-2.
The following examples show how the scale factor is calculated.
Example 1:
AnalogXRange =
IECEQUATION2446 V1 EN-US
The scale factor is calculated as follows:
sc alefactor
IECEQUATION2447 V1 EN-US
The scale factor will be sent as 1 on configuration frame 2, and 0.1 on configuration frame 3. The
range of analog values that can be transmitted in this case is
Example 2:
AnalogXRange =
IECEQUATION2448 V1 EN-US
The scale factor is calculated as follows:
sc alefac tor
IECEQUATION2449 V1 EN-US
The scale factor will be sent as 1 on configuration frame 2, and 0.15 on configuration frame 3. The
range of analog values that can be transmitted in this case is
Example 3:
Analo gXRange =
IECEQUATION2450 V1 EN-US
The scale factor is calculated as follows:
sc alefac tor
IECEQUATION2451 V1 EN-US
Bay control REC670
Application manual
3277.0
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(3277.0 2.0 )
=
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0.1 a nd
65535.0
4915.5
´
(4915.5 2.0 )
=
=
0.15 a nd
65535.0
10000000000
´
(10000000000 2.0)
=
=
65535.5
© Copyright 2017 ABB. All rights reserved
=
offse t
0.0
=
offse t
0.0
=
305180.43 a nd
offse t
0.0
Wide area measurement system
-0.1 to -3276.8 and +0.1 to +3276.7 .
-0.15 to -4915.5 and +0.15 to +4915.5 .
Section 6
103
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