"Jos Bergervoet" wrote in message news:firstname.lastname@example.org...
On 11/25/2012 12:02 PM, Lord Androcles, Zeroth Earl of Medway wrote: > "Don Kelly" wrote in message news:1ogss.6280$Mm3.email@example.com... ... >> I installed a triac dimmer rated for motor loads and this works well. I >> can set a lower voltage limit so that it won't stall. An exhaust fan >> over the stove is similar. I expect that the R/X ratio of the motor is >> such that the peak torque is near standstill. > > Triacs should only be used when the load is resistive.
Enlighten us, O great Lord, why is this? What is wrong with using a triac with an inductive load?
-- Jos ============================================== You really don't know? Attach a couple of hand-held electrodes across the capacitor/solenoid in this buzzer circuit powered with a 9 Volt battery.
Discard the capacitor and short circuit (discard) the speaker transformer so that the only load is the relay coil. Measure the voltage across the relay coil by grasping the electrodes. Hint: It's not 9 volts.
-- This message is brought to you from the keyboard of Lord Androcles, Zeroth Earl of Medway