i am using two Relays to create an H-Bridge. This H-Bridge drives a 24V Motor ~3A in both directions. Now i often got the problem, when i turn on a motor and turn it off again, the relay contacts are getting burned (because the motor gets shorted between the two GND pins and its kinetic force will get stopped and it creates an electric arc)
Do you think i have attached the snubber (R = 27Ohm | C = 470nF) in the right way? Would it be better to create a second snubber on the GND Pin of the Relay, so that both: Motor ON and Motor OFF gets secured by snubber?
Unfortunately we need to short the motors when they are turned off, so it is harder to rotate the rotor of the motor.
The Relay contacts when the motor is getting turned on are always looking very nice, it is mostly the GND contacts on the relay when the motor gets shortet after it is turned off.
Any Ideas? :)
Schematic -> See in the Pictures.
I am also using Free-Wheeling Diodes