I want some help from any instrument or electrical or electronics engineer. I have this electrical diagram on this site, http://a.domaindlx.com/santoshndandekar/q.JPG which has one problem and I’m quite unable to solve it. This is a diagram of a system which has one motorized damper. There are two push buttons to open and shut the damper. Motor is 24 volts AC and a transformer is used to get this voltage from single phase 230 volts AC line. Now, I have done connections as per this diagram and this whole unit is not functioning. The relay in the circuit makes noise and most important thing is that, it makes noise like trrrrr. One more thing, green push button which is NO (normally open) shows continuity which it should not show, that means there is some fault which I cannot see. Please help me to sort out this.
2007-01-12 03:46:23 · 3 answers · asked by Pirate of the Bassein Creek 4 in Science & Mathematics ➔ Engineering
Yes, relay "chatter" may be caused by low voltage; also by trying to operate a dc relay on ac. Check if the relay is actually an ac relay and its coil designed for 230 VAC. Chatter can as well be a result of faulty wiring, the most likely cause, as I see it.
Be aware that in Europe -at least, some parts of it- "closed" means "shut-off", or "disconnected", whereas "open" is construed as just the opposite. This is contrary to American usage of these same words, where “closed” means "conducting", and "open" is synonymous to "broken". From the way you described the green pushbutton (I can't be sure which is it, as colours are not indicated in the schematic), I surmise you're following the American convention, while the schematic appears to have been originated in Europe; at least, it follows that standard.
Nevertheless, the schematic is correct as drawn, and should work as is. I'd suggest you to recheck the wiring, making sure the pushbutton at the top (labeled “CLOSED”) is the one that is normally conducting; the other, in shunt with one set of the control relay (COR) contacts, must be normally non-conducting.
Hope this helps.
2007-01-12 10:03:28 · answer #1 · answered by Jicotillo 6 · 1⤊ 0⤋
Relay "chatter" is caused by low voltage. Normally cause by the relay being far away from the source and suffering from the line resistance. Cant read the drawing very well; but' it looks like you have taken your control loads off of only one phase which could cause an imbalanced load to the motor.
I would suggest testing the voltage on the relay coil while the motor is running and with the control circuit engaged.
Good Luck.
2007-01-12 06:09:22 · answer #2 · answered by HeyDude 3 · 0⤊ 0⤋
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2016-12-13 03:52:55 · answer #3 · answered by gelman 3 · 0⤊ 0⤋