I did some searching on this and found the pages that deal with resistors and inductors in parallel on an AC circuit and did see DC referenced, but would still like some beginner help if that's OK.
I have a DC gearmotor in an application. The supply is 12.0 to 13.7V. The current draw when under the load as required by the application is between 5 and 6 amps. The duty cycle is on for 5 seconds, off for 10 seconds, on for 5 seconds, off for an hour. (the motor is rated for 7.5A)
My issue is dealing with jam conditions. (As you can probably tell by the voltage range, this is a mobile application and I am using ATC style fuses.)
If I fuse it at 5A, the force/torque in a jam is too high for the mechanics of the system. If I fuse it at 4A, it will blow the fuses in less than 2 seconds and the force will be within limits. The issue is that 4A ATC fuses are not common and we'd like to use fuses with the built in LED indication. (I know, I know, picky picky, right?)
I was thinking about putting a higher wattage resistor in parallel with the motor to increase current draw so a more common (5A or 7.5A fuse) would blow in under 3 seconds.
Could I have some help sizing that resistor, please? Any other ideas?
Thanks in advance for the advice.
I have a DC gearmotor in an application. The supply is 12.0 to 13.7V. The current draw when under the load as required by the application is between 5 and 6 amps. The duty cycle is on for 5 seconds, off for 10 seconds, on for 5 seconds, off for an hour. (the motor is rated for 7.5A)
My issue is dealing with jam conditions. (As you can probably tell by the voltage range, this is a mobile application and I am using ATC style fuses.)
If I fuse it at 5A, the force/torque in a jam is too high for the mechanics of the system. If I fuse it at 4A, it will blow the fuses in less than 2 seconds and the force will be within limits. The issue is that 4A ATC fuses are not common and we'd like to use fuses with the built in LED indication. (I know, I know, picky picky, right?)
I was thinking about putting a higher wattage resistor in parallel with the motor to increase current draw so a more common (5A or 7.5A fuse) would blow in under 3 seconds.
Could I have some help sizing that resistor, please? Any other ideas?
Thanks in advance for the advice.