TIC Rollant 240/250 Electric System Description of function: Main power supply Power supply from the tractor to the baler is via connector XV. On the tractor, this prower supply should be protected by a fuse of 25 A max. Potential + 15 This is switched by the main switch T 12 on the control box (electronics +). Potential K 90 / 87 Potential K 90/ 87 is a power plus protected against reverse polarity by diode V10. Overvoltage protection VDR1 becomes conducting when overvoltage occurs. This smooths the voltage peaks in the electronics circuit (+15 / -32). 11/04 rol-e-01a 29