Diagnostics Optimization CT MODBUS RTU Technical Data
E300 Design Guide
379
Issue Number: 1
The table below shows the functions that can be selected with
Variable Selector 1 Mode
(
K32
).
Sectional Controller
If
Variable Selector 1 Mode
(
K32
) = 10 then the variable selector can be used to provide a sectional control function. (Variable selector 2 operates in
the same way.) The sectional control function is intended to apply scaling and a speed offset to a 16 bit position value to generate a new 16 bit
position value. The output can be used as an input to the Standard motion controller (Menu 13) and to generate an encoder simulation output (Menu
3).
The position input is selected with
Variable Selector 1 Source 1
(
K30
) and can be derived from any parameter. However, it is intended to be used with
a position value that has a range from 0 to 65535 (e.g.
Drive Encoder Position
(
J53
)). The input is scaled so that as
Variable Selector 1 Source 1
Scaling
(
K34
) is changed between -4.000 and 4.000 so the proportion of the input position change added to the accumulator varies from 0.000 to
2.000 (i.e. the change of position input value is added without scaling if
Variable Selector 1 Source 1 Scaling
(
K34
) = 0.000). The remainder from the
scaling division is stored and then added at the next sample to maintain an exact ratio between the position input and the position output, provided the
speed from source 2 is zero. The controller only takes the change of position from the input source parameter, and not the absolute value, so that
when the controller is first made active the output does not jump to the source position, but only moves with any changes of source position after that
point in time.
The range of
Variable Selector 1 Output
(
K29
) is 0.00 % and 100.00 %. Unlike other functions the value is not simply limited, but rolls under or over
respectively. Although the output destination can be any parameter it is intended to be used with a position value that has a range from 0 to 65535.
The speed input defines a speed offset with a resolution of 0.1 rpm. Full scale of the source parameter corresponds to 1000.0 rpm. Scaling may be
applied using
Variable Selector 1 Source 2 Scaling
(
K35
) to give a full scale value up to 4000.0 rpm. The speed input is added to the accumulator to
move the output position forwards or backwards with respect to the position input.
The sample time for the variable selector is 4 ms and the input or output position must not change by more than half a revolution over this time.
Therefore the input or output speed must not exceed 7500 rpm.
Variable Selector 1
Mode
(K32)
Variable Selector 1 Output
(K29)
0: Input 1
Input 1
1: Input 2
Input 2
2: Add
Input 1 + Input 2
3: Subtract
Input 1 - Input 2
4: Multiply
(Input 1 x Input 2) / 100.00 %
5: Divide
(Input 1 x 100.00 %) / Input 2
6: Time Const
Input 1 / (1 +
τ
s) where
τ
=
Variable Selector 1 Control
(K36) seconds
7: Ramp
Input 1 as an input to a linear ramp function where the time to ramp from 0.00 % to 100.00 % is defined by
Variable
Selector 1 Control
(
K36
) seconds
8: Modulus
|Input1|
9: Powers
If
Variable Selector 1 Control
(
K36
) = 0.02 then Input
2
/ 100.00 %
Else if
Variable Selector 1 Control
(
K36
) = 0.03 then Input
3
/ 100.00 %
Else Input 1
10: Sectional
See description below
Sectional controller
[4.000 +
VS1 Source 1
Scaling
(
K34
)] / 4.000
VS1 Source 2 Scaling
(
K35
)
Accumulator
VS1 Enable
(
K37
)
Input 1
Input 2
Position input
Speed input
d/dt
Position output
K29
VS1 Output
Summary of Contents for 03200106
Page 490: ...0479 0024 01 ...
