Electrical systems – 5000

13.7 Part numbers

•Press S18 and turn S17 to on at the same time.

•Press S18 until you read Pn= partnumbers.

•You have now choosen Pn= part numbers the symbol “D” on display will be highlighted to indicate what’s currently shown on display. In the start the Pn = part number complete unit will be shown.

•By scrolling with the L1 you can get the following information:

•SPn= Software part number.

•HPn= Hardware part number.

•HSn= Hardware serial number.

13.8 Transistor panel

13.8.1 General

Curtis 1243 is a regulator for controlling shunt motors. Varying the voltage applied through the armature primarily controls the speed. The voltage is varied through use of pulse-width modulation (PWM). This involves varying the “on” time of the MOS-FET transistors regulating the armature current.

Switching of the rotational direction is achieved by switching the polarity on the field winding (S1-S2). The regulator is fitted with a four-quadrant transistor bridge for the field winding and a single-quadrant transistor bridge for the armature winding.