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bersaga
04-09-2003, 09:18 AM
Has anyone heard of Condensor Fan control using single speed fan but using a 'wave clipping' technique to vary the fan speeds ?

Argus
04-09-2003, 11:41 AM
What do you mean by 'wave clipping'?

All speed control modify the supply voltage / wave form in some manner.

Many of them use Triacs. Other forms use Hall Effect or stepping motors.

Some of the Japanese makers use a method that eliminates whole wave forms in a regular sequence.

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bersaga
04-09-2003, 11:59 AM
Yes, it uses Triacs - but I'm not sure how that works except that it clips the waves.

Abe
07-09-2003, 01:33 PM
So can I use a normal light dimmer switch to control a condenser fan ?

bersaga
08-09-2003, 03:27 AM
Thanks Marc - Is the Diac like a Diode ?

bersaga
08-09-2003, 03:27 AM
Thanks Marc - Is the Diac like a Diode ?

frank
14-09-2003, 10:37 PM
A Zenner diode will only allow a set voltage to pass. On a 12 volt zenner, any voltage above 12 volt will be denied. These are used where a set voltage is required, say in a power supply or as a reference voltage.

Peter_1
13-12-2003, 05:21 PM
Originally posted by frank
A Zenner diode will only allow a set voltage to pass. On a 12 volt zenner, any voltage above 12 volt will be denied. These are used where a set voltage is required, say in a power supply or as a reference voltage.

Let's me thinks to a varistor. Each tech of us has allways some varistors in his van.

On each power supply to an expensive device such as electronic thermostats, PCB's, electronic transformers for halogen lights.... we place varistors - which are very cheap (less then 1 € or 1 $) - to protect them for overvoltage.

It protects them also if the common (or neutral) fails for some reason (here we go again) in a 3 x 380 V +N.