Siemens Simovert 6SE70 Series Operating Instructions Manual page 115

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09.02
Example 2 : Available:
Required:
♦ Connect-up parameter r035 at the analog output:
P655 "CUR-AA actual values" = 035
♦ Convert the required output range in [%]:
r035 should be taken from the parameter list, Section 5:
Analog output: 100% = P075
Thus, the following is obtained for the range to be represented:
-630 A → -150% (Parameter value PWE1)
+630 A → 150% (Parameter value PWE2)
♦ Define gain factor P656 and offset P657 :
The following is obtained from the formula shown above:
[ ]
G ain factor V
[ ]
Offset V
To be adjusted: Gain
Siemens AG 6SE7087-6AK85-1AA0
Rectifier/Regenerating Unit Operating Instructions
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P075 (rated DC current) = 420 A
Map the output current r035 between -630 and +630 A to -10.00 V to
+10.00 A at the analog output
[ ] [ ]
( )
− ×
U V U V 100
off1 off2
=
[ ] [ ]
−
PWE % PWE %
1 2
− ×
20.00 V 100 %
= =
6.67
−
300 %
⎛
[ ]
Gain factor
−
⎜
= U V
off1
⎝
100
= − + =
10 V 1 0.00 V 0.00
P656 = +6,67 V
offset P657 = 0,00 V
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represented as V off1 = -10.00 V
represented as V off2 = +10.00 V
− −
% ( 10.00 V 10.00
=
−
- 150 % 150
V
[ ] [ ]
×
⎞
V PWE %
1
= − −
⎟
10V
⎠
%
V
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×
V) 100 %
%
( )
×
⎛ ⎞
6.67 V - 150.00 %
⎜ ⎟
⎝ ⎠
100 %
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