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Guide
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Guide for ceiling fans
- Mounting of ceiling fans
- Design of ceiling fans in school rooms and classrooms
- Design of ceiling fans in offices and conference rooms
- Design of ceiling fans in hotel rooms
- Air flows of ceiling fans in summer operation
- LED lamp flickers when controlled with the remote control
- Why extra flat ceiling fans?
- Distribution and utilization of warm air
- How many blades?
- Save heating costs in winter?
- Forward or reverse, which is better?
- A breath of fresh air in summer?
- What ceiling fan diameter for which room size?
- Electrical connection of your CasaFan ceiling fan
- Always full speed with the ceiling fan
- Avoidance of resonance vibrations during installation
- Mounting on "Berlin ceilings"
- Step switching via bus system
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Stepless control of ceiling fans
- Is reverse running really useful in winter?
- How do resonance noises occur?
- Ceiling fan motor energy consumption
- Connecting a ceiling fan with or without lighting to the house electrical network
- Installation on sloped ceilings
- Mounting ceiling fans on sloped ceilings with high inclination of the ceiling
- Mounting options
- Guide for infrared heaters
- Guide for insect protection
- Guide for ventilation technology
- Guide for TDA system
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Guide for ceiling fans
Stepless control of ceiling fans
- Phase angle controllers control the speed of AC motors by steepening the rising edge of the sine wave. The steeper this slope, the slower the motor runs. In phase-angle controllers, the same thing happens with the falling edge.
However, this produces an effect that can be very unpleasant: the copper wire winding packets in the motor are excited to oscillate. The steeper the slope, the stronger the oscillation. In the case of a two-pole fan, e.g. for toilet ventilation, this is usually irrelevant, since on the one hand there are only two copper wire winding packets, and on the other hand the inherent noise at a rated speed of 2,800 rpm covers up this buzzing.
However, this produces an effect that can be very unpleasant: the copper wire winding packets in the motor are excited to oscillate. The steeper the slope, the stronger the oscillation. In the case of a two-pole fan, e.g. for toilet ventilation, this is usually irrelevant, since on the one hand there are only two copper wire winding packets, and on the other hand the inherent noise at a rated speed of 2,800 rpm covers up this buzzing.
In the case of a ceiling fan with, in some cases, 16 or more poles, the oscillating circuit and thus the possible noise potential is disproportionately greater. In addition, these devices themselves run very quietly and usually in a low-noise environment.
In our experience, this happens regardless of the quality of the speed controller and is related to the working principle of phase angle or phase angle control. Most of these governors have an adjustment screw to set the minimum speed of the motor. In some circumstances, a high minimum speed setting provides some relief. However, the fan can not be damaged by this type of control.
- Dimmers based on the working principle of ohmic resistance are completely unsuitable for speed control of ceiling fans. Loud noises from the motor show a very strong oscillation of the windings. Since the copper wire of the motors is insulated with varnish and this can wear through, a short circuit can destroy the motor. In this case, any warranty claim is void.
We recommend 5-stage transformers for controlling ceiling fans, which are available for individual devices in the surface-mounted version (SCNR5, #12955) up to 100 watts (flush-mounted box SCB5. #22483 available). For common control, we offer 5-stage transformers in ETW 1.0 (up to 1.0 A), ETW 2.2 (up to 2.2 A), ETW 3.5 (up to 3.5 A) and ETW 5 (up to 5.0 A) total load ratings.
Please note that when controlling a fan, up to 10% safety margin should be included in the transformer sizing.
Alternatively, we offer rotary switches for surface or flush mounting with 4 steps (ST4/150 II, #85205) or a selection of remote controls.