Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario descargar pdf (Pagina 34)

Analog Outputs

34 Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013

Filtering

Software filtering will be performed on the analog outputs for certain signal

sources, as specified in Table 1

. “Filter A” is one possible such filter, and it is

described later in this section. Any software filtering is in addition to any

hardware filtering and sampling delays.

Table 1 Software Filters

Analog output software filters are specified in terms of the time it will take the

output of the filter to move from 0% to various higher levels, given an

instantaneous step in the filter input from 0% to 100%. The numbers describing

filters in this document should be considered approximate; the actual values will

depend on implementation.

Filter A is a single pole digital filter with a 162ms time constant. Given a 0% to

100% step input from a steady state, the output of Filter A will take 500ms to get

to 95% of maximum, 810 ms to get to 99%, and 910 ms to get to 100%.

PowerFlex 700 Firmware 3.001 (& later) Enhancements

Certain analog output enhancements have been included in firmware version

3.001 (and later) for the PowerFlex 700 Vector Control drive. These include:

• Ability to scale the analog outputs

• Connect scale blocks to the analog outputs

• Analog Output controlled via Datalink

Output Scaling

A new scaling feature has been added to allow scaling. Prior to this feature,

[Analog Outx Lo] and [Analog Outx Hi] limited only the voltage. This voltage

range was scaled to the selected option range listed in [Analog Outx Sel]. With

the new feature, [Analog Outx Lo] and [Analog Outx Hi] still set the voltage

range, but the scaling parameter now scales the range of the [Analog Outx Sel]

selection. See the following example.

Quantity Filter

Output Frequency No extra filtering

Commanded Frequency No extra filtering

Output Current Filter A

Output Torque Current Filter A

Output Flux Current Filter A

Output Power Filter A

Output Voltage No extra filtering

DC Bus Voltage Filter A

PI Reference No extra filtering

PI Feedback No extra filtering

PI Error No extra filtering

PI Output No extra filtering

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Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario Pagina 34

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