If I change battery voltage, do I need to change a setting in the card of the EV100? (Function 15 I belive)

I have an EV100 in an electric car (homemade convertion) and originaly, the forklift that I removed the parts from, was 48V. Now, with everything installed in the car, I can only get it to operate on 24V. If I try 36V or 48V, It wont operate (Main contactor pulls in, but directional contactors fail to pull in).

Thanx in advance!