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Relay Drop Out Voltage. What you need to do is design your transistor circuit so it draws 250ma. What is happening is the relay is seeing the battery voltage drop to possibly 8 volts as you crank the car.
502 V Continuous Coil Voltage 325/345 PickUp Min/Max from quotigo.com
Drop out voltage (also defined as release, or must release voltage): These values are important to engineers when certain designs are required to function within a certain voltage range. Drop out voltage (also defined as release, or must release voltage):
When The Coil Voltage On An Operate Relay Is Decreased Gradually, The Relay Will Release At A Certain Voltage.
The pick up & drop out voltages are pre set. So the relay never drops out once pulled in at 12v, even though the voltage across the coil is 6v. The relay is equipped with a led which indicates the status of the relay contacts and activation of the time delay.
Below Which A Relay Opens Its Contacts And Comes Back To Its Original Position.
So knowing the relay turn on current, design your transistor circuit with that spec in mind. These values are important to engineers when certain designs are required to function within a certain voltage range. Drop out voltage (also defined as release, or must release voltage):
Dropout Voltage Is The Maximum Voltage At Which The Relay Is Guaranteed To Drop Out After It Has Been Pulled In (Similar To Vil For A Digital Gate).
Possibly a diferant automobil relay might work as when your car engin is running the voltage could be 14.5 volts but drop to 8 volts when starting. The min means that the voltage may be greater then 10% to drop out, but 10% is the minimum value of all voltages applied starting from where the manufacturer guarantee to drop out. What is a drop out relay?
Condition After Applied The Nominal Coil Voltage In A Single Side Stable.
So your relay will probably drop out somewhere between one and two time constants. What you need to do is design your transistor circuit so it draws 250ma. The voltage falls down to about 9 v in one time constant (coil resistance times capacitor value) and to just above 3 v in two time constants.
This Is The Current Specification Of The Relay As You Have Stated.
For dc relays, the drop out voltage is surprisingly small. Maximum allowable voltage drop for any relay or switch contact is 300mv (.300v). So when the voltage in the coil exceeds the threshold value, the relay picks up and the normally open contacts are closed and the normally close contacts are opened.
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