Motorcycle Relay When Working Normally
Motorcycle Relay When working normally
Precautions for use of the relay
1, the rated voltage: refers to the normal operation of the relay coil voltage required. Depending on the type of relay can be AC voltage, it can be DC voltage. 2, DC resistance: Refers to the coil in the relay DC resistance, can be measured through the multimeter.
3, pull-in current: Relays can generate the minimum current pull-action. In normal use, the given current must be slightly larger than the pull-in current, so that the relay can work stably. As for the coil plus the operating voltage, generally not more than 1.5 times the rated operating voltage, otherwise it will have a larger current and the coil burned.
4, the release of current: refers to the relay to generate the maximum current release action. When the relay pull-in state of the current is reduced to a certain extent, the relay will be restored to the power-off state. The current at this time is much smaller than the pull-in current.
5, contact switching voltage and current: refers to the relay allows the load voltage and current. It determines the size of the relay can control the voltage and current, when used can not exceed this value, otherwise it is easy to damage the relay contacts. With technology; refers to the relay coil in the case of loss of current will produce a very high reverse electromotive force, it is easy to damage the electronic device control it, be sure to focus on the use of the circuit in the design of the absorption circuit. Relay classification and what are the effects
(1) current relay: reflecting the increase of current action, as the current protection of the starting components and measuring components. (2) voltage relay: reflecting changes in voltage (over or under) and action.
(3) time relay: as a time element, used to establish the necessary delay.
(4) Intermediate relay: its role is to: increase the number of contacts in order to control the different circuits; increase the contact capacity in order to open or close the circuit of larger current; provide the necessary delay in order to meet the protection and automatic devices Request.
(5) Signal Relays: In the protection and automatic devices as a motion indicator. In action, on the one hand there is a sign of loss or light instructions, on the other hand it is closed to keep the mechanical shock, turn on the lights and sound circuit. Then by the duty staff to manually reset. Elimination of relay contact spark method
Because the relay contacts on and off current is small, there will be no arc between the contacts, but there will be a "spark discharge", which is due to the presence of inductance in the contact circuit, the inductor will appear in the open over-voltage, it and the supply voltage Add together in the contact gap, so that just separated from the contact gap breakdown and discharge. Due to the limited energy, it will only produce spark discharge. The alternation of the energy between the capacitor and inductor in the contact point will make the spark discharge and appear as a high-frequency signal, and the spark discharge will also cause damage , And will reduce the life, it must try to eliminate, there are two practical spark circuit. one. The basic principle is that the energy in the inductor does not pass through the contacts rc; Disconnected through the diode v consumed in the load r.l. Choose one in the application on the line. However, it should be noted that, rc parameters to choose the appropriate parameters mainly depends on the experiment to determine, usually capacitance c can be selected according to the load current 1a / 1 microfarads. The positive and negative polarity of the diode should be connected correctly.