Exciter wire is connected to the L terminal of an alternator and is used to turn on the voltage regulator. Excitor wire is needed to generate the voltage required for the alternator to start running. The positive and negative cables are small and connected to the respective terminals of the battery.
The exciter wire is used to turn on the voltage regulator. This wire, when unplugged, should have approx. 12.5 volts with the key on. If it does not then the alternator will not work.
How do I charge my alternator excite?
Take a small piece of wire and touch one end of it to the battery alternator terminal.Then touch the other end to the small “R” terminal. (Note: This may create a small spark, which is normal.) Remove the wire and start the vehicle.
Why do you need to excite an alternator?
Without the excitation system the AC alternator would have no way of building its voltage as it starts to rotate, nor would not be able to regulate its voltage to the pre-set nominal level while running at its rated speed. So, without an excitation system, an AC alternator would be useless for its purpose.
Which wire is the alternator exciter wire? – Related Questions
How does alternator exciter work?
The exciter rotor generates electrical energy as it spins because the magnetic field of the exciter stator cuts through the copper windings of the exciter rotor, inducing a voltage.
How do you excite a single wire alternator?
What is stator wire on alternator for?
The main stator is the main component part an AC generator (or alternator). It is where the electrical energy is created to supply a load. The alternators excitation system attempts to control the voltage generated in the main stator to a pre-set point.
Why alternators are connected in parallel?
The parallel operation of alternators ensures greater security of supply and enables overall economic generation.
What is the L terminal on an alternator?
L terminal: Closes the circuit to the warning lamp. B terminal: Main alternator output terminal (connected to the battery) F terminal: Full-field bypass for regulator.
When an alternator is loaded its terminal voltage?
The terminal voltage(line voltage) of a 3-phase star-connected alternator is 10.5 kV at a 0.8 lagging power factor when the alternator is fully loaded.
What happens when an alternator is said to be over excited?
An overexcited alternator always supplies lagging current to the connected load, which means that load is of lagging nature. Lagging load take active and reactive power from the supply or alternator. Therefore, reactive power flows outwards from an over-excited alternator.
How do you increase terminal voltage on an alternator?
As per alternator theory, increasing excitation will increase terminal voltage of alternator, but the load current will remain constant since input torque is held constant (no VAR output as load is resistive).
What causes voltage drop in alternator when loaded?
When load is applied to the AC alternator, the increase in current causes a decrease in voltage in the main stator and generator terminals. This drop in voltage is called “transient voltage dip” The excitation system then reacts to try and return the voltage to the pre-set steady state.
How do you overcome voltage drop?
The simplest way to reduce voltage drop is to increase the diameter of the conductor between the source and the load, which lowers the overall resistance. In power distribution systems, a given amount of power can be transmitted with less voltage drop if a higher voltage is used.
What three voltage drops occur in an alternator?
In an alternator, voltage drops occurs in. (D) armature resistance, leakage reactance, armature reaction and earth connections.