Two and Four Wheel Drive
138. The whole Electric Drive circuit will work in a basic form without the Main Signal Processor (MSP), but when it is installed, the Timer Relays are also installed and it must use the TRS signal to update the ON state of those relays constantly, otherwise power will be removed from the electric motors. That signal confirms that the Main Signal Processor (MSP) is returning from all subroutines correctly in a timely manner. The Main Signal Processor may have reason not to update the TRS signal, even though it is working correctly.
139. The Electromagnetic Clutches (EMC) receive power over the CLP2 and CLP4 connections. They are wired in series accordingly, so that the same current will flow threw the left and right sides.
140. The Electromagnetic Brakes (EMB) receive power over the E-BP connection. Safety is well served, if the standard purely mechanical brakes for motor vehicles are also used, because stand still is the safest state for vehicles.
141. The rotors of the electric motors are connected to the Resistor Banks (2WRL) and (4WRL). The resistors are used to limit the maximum current that the motors will be able to draw from the Power Supply (PS).
142. The slip frequency of the motors are supplied to the Main Signal Processor (MSP) over the M2F and M4F connections.
143. M2-SL is the serial link between MSP and Resistor Banks (2WRL). M4-SL is the serial link between MSP and Resistor Banks (4WRL).
144. The GL1 signal from the Man Machine Interface (MMI) is used to switch resistance ladders inside the 2WRL and 4WRL circuit so that their maximum rotor currents will be controlled. The Main Signal Processor can also modify the selection by 30% to match driving on flat surfaces with driving on slopes.
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Page 16 Preface
The electric vehicle's wheel drive circuitry is designed to be either for two or four wheel drive.