Danfoss VLT Flow Drive FC 111 Design Manual page 30

VLT® Flow Drive FC 111
Design Guide
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 drive 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 drive 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
3.3.1 Air Humidity
The drive has been designed to meet the IEC/EN 60068-2-3 standard, EN 50178 9.4.2.2 at 50 °C (122 °F).
3.3.2 Acoustic Noise or Vibration
If the motor or the equipment driven by the motor - for example, a fan - makes noise or vibrations at certain frequencies, configure
the following parameters or parameter groups to reduce or eliminate the noise or vibrations:
• Parameter group 4-6* Speed Bypass.
•
Set parameter 14-03 Overmodulation to [0] Off.
•
Switching pattern and switching frequency parameter group 14-0* Inverter Switching.
•
Parameter 1-64 Resonance Dampening.
3.3.2.1 Acoustic Noise
The acoustic noise from the drive comes from 3 sources:
• DC-link coils.
• Integral fan.
• RFI filter choke.
Table 6: Typical Values Measured at a Distance of 1 m (3.28 ft) from the Unit
Enclosure size
H1
H2
H3
H4
H5
H6
H7
H8
H13
H14
The values are measured under the background of 35 dBA noise and the fan running with full speed.
1
30 | Danfoss A/S © 2021.04
Level [dBA]
(1)
43.6
50.2
53.8
64
63.7
71.5
67.5 (75 kW (100 hp) 71.5 dB)
73.5
73
75
Product Overview
AJ363928382091en-000101 / 130R0983