Tuning The Drive Closed-Loop Controller; Manual Pi Adjustment; Ambient Running Conditions - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

Product Overview
3.2.7 Tuning the Drive Closed-loop
Controller
Once the frequency converter's closed-loop controller has
been set up, test the performance of the controller. Often,
3 3
its performance may be acceptable using the default
values of parameter 20-93 PI Proportional Gain and
parameter 20-94 PI Integral Time. However, sometimes it
may be helpful to optimize these parameter values to
provide faster system response while still controlling speed
overshoot.

3.2.8 Manual PI Adjustment

1. Start the motor.
2. Set parameter 20-93 PI Proportional Gain to 0.3
and increase it until the feedback signal begins to
oscillate. If necessary, start and stop the
frequency converter or make step changes in the
setpoint reference to attempt to cause oscillation.
3. Reduce the PI proportional gain until the
feedback signal stabilizes.
4. Reduce the proportional gain by 40–60%.
5. Set parameter 20-94 PI Integral Time to 20 s and
reduce it until the feedback signal begins to
oscillate. If necessary, start and stop the
frequency converter or make step changes in the
setpoint reference to attempt to cause oscillation.
6. Increase the PI integral time until the feedback
signal stabilizes.
7. Increase the integral time by 15–50%.

3.3 Ambient Running Conditions

The frequency converter has been designed to meet the
IEC/EN 60068-2-3 standard, EN 50178 9.4.2.2 at 50 °C
(122 °F).
The ambient temperature measured over 24 hours should
be at least 5 °C (41 °F) lower than the maximum ambient
temperature. If the frequency converter is operated at high
ambient temperature, decrease the continuous output
current.
30
®
VLT HVAC Basic Drive FC 101
110%
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Illustration 3.22 0.25–0.75 kW (0.34–1 hp), 200 V, Enclosure
Size H1, IP20
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Illustration 3.23 0.37–1.5 kW (0.5–2 hp), 400 V, Enclosure Size
H1, IP20
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Illustration 3.24 2.2 kW (3 hp), 200 V, Enclosure Size H2, IP20
Danfoss A/S © 04/2016 All rights reserved.
I [%]
out
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I [%]
out
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40 o C
45 C
o
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f [kHz]
sw
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C
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MG18C702