boat tachometer wiring diagram

• 2022-05-05

Add a DC motor to the main shaft of the boat engine (e.g. next to the generator). Then measure the voltage, and then calibrate the corresponding value with the tachometer to make a scale. There are two types of tachometers, mechanical and inductive. Only the speed line of the machine does not need power supply. The inductance consists of the positive and negative poles and the signal line. The positive pole is positively charged after the switch is connected, the negative pole is grounded, and the signal line is connected to trigger the positive pole.

The VCC of the steering gear should be directly connected to the positive pole of the power supply, and the signal line can be connected to any IO pin of the single chip microcomputer. The signal line requires that the driving current is small without amplification. In addition, the power ground should be connected with the negative pole of the steering gear. Steering gear is a kind of large deck machinery on ships. The size of the steering gear is determined by the external outfitting according to the specifications of the classification society, and the torque is mainly considered in the selection.

The normal tachometer is connected to the output end of the trigger coil, which is blue and white. This line can be extracted from the magneto line group or connected from the igniter to work with pulse signal. Remember: a few tachometers are connected to the AC coil to provide speed signal with voltage rise as the parameter. Electric start slipping, replace the starting disc (electric start clutch disc)! Or overrunning clutch. Connect the high voltage primary of the igniter, and the ignition voltage is about 200V. If your tachometer is not designed with high voltage sensitivity, the display is inaccurate. The pulse signal of the tachometer generally comes from three sources, one is the trigger signal, one is the ignition high-voltage primary, and the other is the AC output of the magneto. You can test it separately and use whichever is right.If it is a mechanical tachometer, it is an inductive tachometer transmitted to the instrument panel through the gear transmission flexible shaft of the front wheel. Generally, there are three lines, one is connected to the positive, one is connected to the negative, and the other is connected to the boat magneto trigger line to induce the speed through the pulse of the magneto.