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what would putting a thermister in series with the motor do?GraveYard_Killer said:it seems the first circuit you posted is right. i believe that your problem will be solved by putting an NTC thermistor in series with the high torque motor load...
williB said:what would putting a thermister in series with the motor do?GraveYard_Killer said:it seems the first circuit you posted is right. i believe that your problem will be solved by putting an NTC thermistor in series with the high torque motor load...
with a properly designed relay circuit the initial current spike is not a problemGraveYard_Killer said:williB said:what would putting a thermister in series with the motor do?GraveYard_Killer said:it seems the first circuit you posted is right. i believe that your problem will be solved by putting an NTC thermistor in series with the high torque motor load...
limit the inrush current which causes the relay to stop operating.
his motor load is too high for an NTC thermistorGraveYard_Killer said:cause it happened to me once. driving an inductive buzzer load.
i changed 3 relays, no luck.
put capacitor as well as diode across relay, no luck.
isolated power supply, still no luck.
isolated with optocoupler, still no luck.
what i noticed with one of my relay(which has a transparent casing), there is a spark whenever relay activates, i figure out that inrush current is making my relay stop and pic to reset. i put a series NTC thermistor, since initially it exhibits high resistance which is ideal to stop inrush current, in series with my inductive load, and all problems gone, circuit worked flawlessly now.
what is 3 to 5 volts.??
across the motor or the relay?Gundam82 said:what is 3 to 5 volts.??
wat i mean is when i apply 3 volt or 5 volts the same problem still occurs.....!!!! the voltage so small....