Hi Pav,Hi all,
Apologies if this has been covered, I tried my best attempts at googling and searching and couldn't find an answer.
I'm looking to potentially run an Agni Lynch LEM200/127 PMDC for a simple conversion that doesn't need a lot of power. These are easy to come by. The plan is to run it at approx 48V.
However, I'm struggling to find a reasonably priced PMDC motor controller for the above.
So here comes the stupid question:
Can I use a 48V SepEx controller for the above, and just not connect the field coil outputs?
It can be done. But you need to hook a power resistor to the field output of the controller. If there is no field current, the controller will sense a fault. The power resistor waste the power typically used to excite the field, but fools the controller. Some adjustments are needed in the field map. Wasted power isn't terribly high. Not great, but acceptable for a hack.
I've used this method to power large resistors for controlled current battery load testing. It actually worked very well. I am not sure how it will behave dynamically on a traction application, but don't offhand see a problem.