PowerFlex Digital DC Drive User Manual -
Publication 20P-UM001C-EN-P - July 2008
C-16
Application Notes
Scale Blocks
The Scale Blocks function allows you to link or rescale dissimilar parameter
types (e.g., integer vs. real) though multiply, divide, maximum and
minimum limits, input and output offsets and absolute value functions.
There are six individually configurable Scale Blocks. A representative block
diagram is shown below.
Important: The Scale Blocks functions are executed sequentially in the
background, which can cause a delay in processing data
between the input and output values. The amount of delay is
dependant on the application.
The following rules apply to Scale Blocks:
•
All input [Scalex Input] and output [Scalex Output] values are specified
as a parameter number (not parameter values).
•
Both Sink (read/write) and Source (read only) parameters can be used as
input values ([Scalex Input]).
•
Only Sink (read/write) parameters can be used as the output value
([Scalex Output]).
•
Configuration parameters (parameters that can only be changed while
the drive is stopped) can be used as the output value ([Scalex Output]).
However, any value written to a configuration parameter will not take
effect in the drive until it is stopped.
•
The output value is truncated to a whole number when different
parameter types are used (e.g., a real input value of 54.97% becomes an
integer output value of 54 RPM).
•
Dividing by zero (0) does not cause an error, but will result in an output
value of zero (0).
•
Turning off (setting = “0”) the input parameter or changing the output
parameter number does not reset or change the original output value (i.e.,
the output parameter remains at the last value written).
Σ
+
+
X
+
+
S
c
a
le Block 1
P4
8
4
S
c
a
le1 Inp
u
t
P492
S
c
a
le1 In A
bs
P490
S
c
a
le1 In Off
P4
8
9
S
c
a
le1 In Min
P4
88
S
c
a
le1 In M
a
x
P4
8
6
S
c
a
le1 M
u
l
P4
8
7
S
c
a
le1 Div
P491
S
c
a
le1 O
u
t Off
P4
8
5
S
c
a
le1 O
u
tp
u
t
Σ
Содержание PowerFlex series
Страница 1: ...USER MANUAL Firmware Version 1 006 2 001 PowerFlex Digital DC Drive ...
Страница 190: ...PowerFlex Digital DC Drive User Manual Publication 20P UM001C EN P July 2008 A 22 Supplemental Drive Information Notes ...
Страница 292: ...Index 24 PowerFlex Digital DC Drive User Manual Publication 20P UM001C EN P July 2008 ...
Страница 293: ......