Given a ERR board labeled AC/DC commander. Am I safe to connect it as described in the AC/DC manual or are their other differences? No need to fry anything that does not need frying.
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The AC/DC Commander comes in two flavors, one for DC motors and one for AC motors. If it has a large square heatsink between the driver triacs, it's for DC motors, if that heatsink is not there, it's for AC motors.
I think you mean bridge rectifier, not heat sink.
Also, your picture of the DC Commander is actually a picture of a Cruise Commander.
OK so what rectifier can I add to one to use for dc motors??
The firmware is the same on the AC Commander and the DC Commander. You can add a 8Amp Bridge rectifier to the AC Commander and make it a DC Commander.
The Bridge is a PB-6 package type.