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Specify the Feedback Response
For V/I frequency control establish the response slope of the ASD by entering two parameter pairs.
Each parameter pair consists of an input point setting
(F201
and F203) at that setting.
If using either RR or RX for frequency control, set their respective response slope parameters,
F213
or
F216 –
For a 4 - 20 mA current loop feedback signal, 4 mA is 20% of 20 mA. Set parameter F201 to 20% at
4 mA and F202 to 0 Hz, F203 to 100% at 20 mA and F204 to 80 Hz.
Figure 6. V/I input points for 4-20 mA feedback signal.
F204
80 Hz
F202
0 Hz
Reverse the Feedback Response
A negative response slope can be established by either of two methods:
•
Switch the values of the V/I Input Point Frequencies F202 and F204.
•
Switch the ASD response from normal to inverted.
Example:
Reverse the Response Slope Using V/I Input Point Settings.
A system using a 4 – 20 mA feedback signal requires an inverted feedback response slope. Parameters
F201 – F204 would have their values set as shown below.
Figure 7. Inverting the feedback response slope.
4
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F219, as above.
4 mA
20 mA
F201
F203
20%
100%
F202
80 Hz
F204
0 Hz
4 mA
F201
20%
(F202
and F204) and a corresponding frequency
20 mA
F203
100%
F210 –
PID Control Manual
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