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5 LF45/55 series Description of components COMPONENTS 2-5 Connection 15 When the contact has been turned on, power is supplied to the alternator via connection 15, pin 3 (1010). The regulator uses this power to activate pre-excitation (self-energising). If there is an open circuit in this connection, the alternator will not produce any power until it reaches a speed of about 5000 rpm. This corresponds to an engine speed of approx. 1500 rpm. The alternator will energise itself when it reaches this speed. Sens connection The sens connection, pin 4, can be used to compensate for voltage losses in B+. There are voltage differences between the alternator and the battery. Voltage regulation can be improved if these voltage variations can be controlled. This function is, however, not used. The sens connection is connected directly to B+2 and therefore no voltage differences are measured. L connection The L connection, pin 2, is connected to the VIC electronic unit. This connection is used to activate a fault message in the main display via the VIC, if necessary. L voltage high: no fault L voltage low: fault The following faults can be detected via the “L”-connection: - voltage too low (< 16 V) - open circuit in connection 15 (1010) - open circuit in “S” connection - open circuit in “L” connection These faults are indicated by the yellow “Alternator fault” warning. Too high a voltage (red warning) can be recognised by too high a voltage (>31 V) on the VIC electronic unit. E501129 L 15 S 2 200440 |