Programming Your Application 1-99
690+ Series Frequency Inverter
SETPOINT SCALE
Designed for all Motor Control Modes.
This function block simply converts the way
the setpoint is expressed from being a
percentage of the MAX SPEED to an
absolute frequency in electrical Hertz.
Functional Description
The setpoint scale block changes the format in which the setpoint is expressed. The function
blocks on the input side of this block process the setpoint as a percentage of maximum RPM.
The function blocks on the output side of this block process the setpoint as an absolute
frequency of rotation of the electric field in Hertz.
X
INPUT
OUTPUT
X
MOTOR POLES
2 x 60
MAX SPEED
100%
+110%
-110%
Setpoint Scale
–
OUTPUT [ 59]
–
0.0 Hz
0.00 %
–
[ 58] INPUT
–
** 1500 RPM
–
[1032] MAX SPEED
–
MMI Menu Map
1
SETUP
2
MOTOR CONTROL
3
SETPOINT SCALE
INPUT
MAX SPEED
OUTPUT
Parameter Descriptions
INPUT
Range: -300.00 to 300.00 %
The setpoint delivered by the re-wired function block portion of the Inverter’s application.
MAX SPEED
Range: 0 to 32000 rpm
The physical motor speed equivalent to a setpoint demand of 100.00%. Note that although
INPUT may be set between ±300%, the input value is clamped before being used to ±110%.
Hence, the greatest input speed which can be demanded is ±110% of MAX SPEED.
Refer to Chapter 2: “Parameter Specification” - Frequency Dependent Defaults
OUTPUT
Range: —.x %
Output =
max speed x input
100%
x
number of motor poles
2
x
1
60
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