Allen-Bradley PowerFlex 70 Enhanced Control, Справочное руководство, Страница: 16 / 170

12 Analog Outputs
Filtering
Software filtering is performed on quantities that can be monitored as described in
the following table. The purpose of this filtering is to provide a signal and display
that is less sensitive to noise and ripple.
Software Filters
Scale Block Analog Output
In addition to the common selections, an analog output can be driven by any
available data. The data can then be scaled before it reaches the output. A “Link”
function establishes a connection from the data to the input of a “Scale Block.”
The analog output selection “Scale Block x” makes the connection from the output
of the scale block to the physical output.
Example
Analog Output 2 set for 0-10V DC for Heat Sink Temp 0-100 Degrees C. using Scale Block 1. Setup:
−
Link [Scale1 In Value], parameter 476 to [Testpoint 1 Data], param. 235
−
[Testpoint 1 Sel], parameter 234 = 2 “Heat Sink Temp”
−
[Analog Out2 Sel], parameter 345 = 20 “Scale Block 1”
−
[Analog Out2 Hi], parameter 346 = 10.000 Volts
−
[Analog Out2 Lo], parameter 347 = 0.000 Volts
−
[Scale1 In Hi], parameter 477 = 100
−
[Scale1 In Lo], parameter 478 = 0
Network Controlled Analog Output
Enables the analog outputs to be controlled by network Datalinks to the drive.
Example
Analog Output 1 controlled by DataLink C1. Output 0-10V DC with DataLink values of 0-10000. Setup:
−
[Data In C1], parameter = 304 “Analog Output 1 Setpoint”
−
[Analog Out1 Sel], parameter 342 = 24 “Parameter Control”
−
[Analog Out1 Hi], parameter 343 = 10.000 Volts
−
[Analog Out1 Lo], parameter 344= 0.000 Volts
The device that writes to DataLink C1 now controls the voltage output of Analog Out1. For example:
2500 = 2.5V DC, 5000 = 5.0V DC, 7500 = 7.5V DC.
Quantity Filter
Output Frequency No Filtering
Commanded Frequency Filtered
Output Current Filtered
Output Torque Current Filtered
Output Flux Current Filtered
Output Power Filtered
Output Voltage Filtered
DC Bus Voltage Filtered
PI Reference No Filtering
PI Feedback No Filtering
PI Error No Filtering
PI Output No Filtering
700VC ONLY
477
In Lo
In Hi
In Hi
Out Lo
Out
Out Hi
235
Testpoint 1 Data
476
478
479
481
480
Scale 1
Link