User Manual Instruction Manual

13-58 GV6000 AC Drive User Manual
13.20.5 Filtering
Software filtering will be performed on the analog outputs for certain signal sources,
as specified in Table 13-2. “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.
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%.
13.20.6 Enhancements
Certain analog output enhancements have been included in the GV6000 . These
include:
• Ability to scale the analog outputs
• Connect scale blocks to the analog outputs
• Analog Output controlled via Datalink
13.20.6.1 Output Scaling
A new scaling feature has been included to allow scaling. Without 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 this 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.
Example
Analog Output 1 set for 0-10V DC at 0-100% Commanded Torque.
Table 13.2 – Software Filters
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