how do i know if pololu a4988 driver is dead or not with multimeter only???if possibe...
I assume you also have a stepper motor?
Part of the problem of testing a stepper driver is that you might destroy while testing. NEVER allow a wire between the motor and the driver to disconnect even briefly while the driver is powered.
With that in mind you could put your multimeter on its 10 amp setting between the driver and the motor and see what current flows when the driver is enabled and the motor is stationary. If the correct current flows in the first coil turn everything off and connect the multimeter in the wire for the second coil.
A simpler solution is try driving the motor with a good driver.
thanks robin sir for reply
i checked the driver and it is dead now,and i think the reason is i disconnected the motor while supplying 20amps 12volt power.
theRoBobuilder:
while supplying 20amps 12volt power.
Somehow find that hard to believe.
theRoBobuilder:
how do i know if pololu a4988 driver is dead or not with multimeter only???if possible...
Basically drive it as usual ..... and use your multimeter in DC voltage setting ---- and see if there's any voltage across the output.
theRoBobuilder:
i checked the driver and it is dead now,and i think the reason is i disconnected the motor while supplying 20amps 12volt power.
The a4988 is has a current rating of around 2 amp. Apparently can handle peaks of 4 amp, but better stick with max of 2 amp. The 20 amp, 12 volt condition you mentioned sounds erroneous.
Southpark:
The a4988 is has a current rating of around 2 amp. Apparently can handle peaks of 4 amp, but better stick with max of 2 amp. The 20 amp, 12 volt condition you mentioned sounds erroneous.
Anything over 1.5 amps is going to be a struggle unless there is a heatsink and cooling fan.
It doesn't matter if a power supply is capable of supplying hundreds of amps - the device will only take as many amps as it needs. Having the correct voltage is the important thing.
...R