Motorcycle Relay Parameter Test
Motorcycle Relay Parameter test
In addition to the relay for a comprehensive parameter test and effective screening, the rational use of the relay is also an effective way to improve the use of reliability. On the contrary, improper use will shorten the life of the relay, the use of a number of issues to be discussed.
1. Reasonable choice of relay operating voltage
The pull-in voltage of the relay is generally only one-half to two-thirds of its rated operating voltage, but must be operated at its rated operating voltage when using the relay, not the pull-in voltage as the operating voltage. This is because, although the relay has been actuated under the pull-up voltage condition, the pressure between the movable contacts has not reached the specified value, which will result in a large contact resistance between the contacts, such as contact at high current conditions Work, it will increase the contact power, easy to cause contact ablation, shorten the working life.
2. With no current switching
Although the relay's technical indicators are given the allowable contact power, but also gives the corresponding electrical life, allowing the contact of the relay live to switch, but in the case of possible or should try to avoid contact with the power switch, using No current switching will greatly improve the life of the relay.
3. Avoid using relays at low and micro currents
As the relay has a low-level failure mode, should try to avoid the relay contacts work in low, micro current. Where possible, you can choose solid state relays, analog instead of relays. In the case of using a relay to switch low, micro-current conditions can be used reed relay, because the reed relay will seal the seal in the glass tube, and the winding outside the glass tube. This will significantly reduce the likelihood that the contacts will produce a passivation film and cause a low level of failure, as compared to a conventional relay that seals the contacts in the same housing as the contacts. 4. The extinguishing line of the relay
The winding of the relay is an inductor, and there is an armature in the winding, so that the magnetic energy is stored after the winding is energized, and the magnetic energy release produces a high back electromotive force (sometimes up to several hundred volts) at the moment the winding is turned off. This back electromotive force on the one hand easy to drive the relay devices (such as transistors, integrated circuits) breakdown, on the other hand will cause spikes, interference with the machine and other lines in the system of normal work. The simplest solution to this problem is to turn off a reverse-peak diode (also called freewheeling diode) in parallel with the windings of the relay. It should be noted, however, that the addition of the anti-peak diode will significantly extend the release time of the relay.