E339
Components Behind Logic Unit (1) (17) Driver board. (18) T1P (transistor one pump). (19) T2P (transistor two pump). (20) T3P (transistor three pump). (21) T1D (transistor one drive). (22) T2D (transistor two drive). (23) T3P (transistor 3 pump). (24) D6D (diode 6 drive) regen diode. (25) Control thermostat. (26) Connector P5. (27) Charging resistor. (28) Current sensor. (29) D4P (diode four pump) flyback diode. (30) D4D (diode four drive) flyback diode. (31) D5D (diode five drive) plugging diode.
NOTE: The 72/80V trucks only have two pump and two drive power transistors instead of the three that 36/48 trucks have.
MicroCommand Control System
16
Systems Operation
