Repair of common fault of relay
The 1 contact loose back cracking
Contact relay switching load electrical contact parts, some products of contact is by riveting pressure, its main disadvantage is loose, contact contact cracking or excessive size position deviation. This will affect the relay contact reliability. Appear to loose, reed and the contact part is matched with the size of the unreasonable or the operator of the riveting pressure regulation caused by improper. Contact cracking material hardness is too high or too much pressure caused by the. For different material contacts using different materials, processes, some higher of hardness of contact materials should be annealed, the contact manufacturing, riveting or welding. Contact manufacturing should be careful, because materials have tolerance, so every time cut to length should touch after the decision. Contact manufacturing should not appear to fly side, pads and not full phenomenon. Contact rivet partial is the operator will touch with no right, upper and lower touch a misplacement caused. Contact damage, pollution, is not clean touch with the oil pollution and iron filings and other matter is caused by. No matter what ills, will affect the relay reliability. Therefore, in the contact manufacturing, riveting or welding process, to comply with the first piece inspection center sampling and final inspection inspection regulations, to improve assembly quality.
The 2 relay parameter instability
Electromagnetic relay parts quite part is riveted with, existence main question is riveted at loose or poor bonding strength. It can make the relay parameter is not stable, high and low temperature parameters, mechanical vibration resistance, shock resistance ability. The trouble is caused mainly by riveting pieces of ultra difference, improper placement of parts, touch with the quality standards or installation is not accurate. Therefore, the welding carefully before inspection of touch with and whether it meets the requirements of riveting parts.
The 3 electromagnetic system riveting piece deformation
Riveting parts after bending, twisting, thick black to the next process assembly or adjustment difficulties, even causing scrap. This problem is caused mainly by riveting parts of long, short or riveting force is not uniform, touch with the assembly deviation or the size of design errors, caused by the improper parts placement. In a riveting, workers should first check the components size, shape, touch is accurate, if not installed in touch with will affect the electromagnetic system assembly quality or core, upsetting deformation.
4 glass insulator damage
Glass insulator is composed of a metal pin and a glass sintering, in the inspection, assembly, adjustment, transportation, cleaning easily appearing when the pin bending, glass insulator block, cracking, caused by leakage and insulation and withstand voltage drop in performance, pin rotation will result in contact spring shift, influence the product reliable on-off. This requires the assembly of the operator in the production of the relay in whole process to light-light, parts should be aligned on the transfer box, assembly or adjustment, do not allow a or reverse pin.
The 5 coil fault
Relay coils used in variety, with outsourcing, there are no outsourcing, coil should be placed in a dedicated single spaced apparatus, if the collision junctor, in separate will cause the disconnection. In the electromagnetic system riveting, Shouban presses and press pressure adjustment should be moderate, too much pressure can cause the coil wire or coil frame cracking, variant, winding breakdown. Pressure is too small will cause winding looseness, magnetic loss increase. Multiple winding coil is generally used to lead a different color. When welding, attention should be resolved, otherwise it will result in wrong coil welding. Through the end of the coil are required, usually used for labeling methods indicate the beginning and end. Assembly and welding should pay attention, otherwise it will cause the relay of the opposite.
The 1 sensing mechanism of maintenance
For electromagnetic ( voltage, current, intermediate ) relay, its sensing mechanism for electromagnetic system. Electromagnetic system fault concentrated coil and dynamic, static iron core part. Commonly encountered failure and maintenance method:
( 1) coil fault maintenance
Coil fault is usually coil insulation damage from mechanical injury; formation of inter-turn short circuit or ground; because of low voltage, dynamic, static iron core contact is not tight, so that the current through the coil is too large, heating of the coil to burn out. The repair, should rewinding coil. If after the coil is energized the armature is attracted, may be a coil lead wires are connected to the coil off, circuit breaker. Check out the off after welding can.
( 2) core fault maintenance
Iron core fault are energized after sucking on armature. This may be due to dynamic, static iron core coil breakage between foreign body, low voltage caused by. Should distinguish a case repair. After the power is switched on, if the armature noise. This may be due to the dynamic, static iron core contact surface is not flat, or have the oil pollution. Repair, remove the coil, smooth or flat contact surface; if oil should be cleaned.
The 2 actuator maintenance
Most relay actuator is contact system. Through its " on" and "off", to complete certain control functions. Contact system fault contact overheat, wear, welding etc.. The contact caused by overheating is the main cause of insufficient capacity, the contact pressure is not enough, surface oxidation or not clean; cause increased wear is the major cause of contact capacity is too small, too high temperature of the contact arc metal oxide; the contact caused by welding is the main cause of arc temperature is too high, or contact a serious beating. Contact maintenance order as follows:
( 1) open the outer cover, check the contact surface.
( 2) if the contact surface oxidation, the silver contacts can be repaired, the copper contacts available barrette file file or use a knife to gently scrape the surface oxidation layer.
( 3) if the contact surface is not clean, use gasoline or carbon tetrachloride cleaning.
( 4) if the contact surface burns the singeing traces of silver contacts, may not be renovated, on copper contacts available barrette file or a knife trimming. Do not allow to use emery cloth sandpaper to renovate or, to prevent residual sand, resulting in poor contact.
( 5) the contact if welding, should replace contact. If it is because the contact capacity is too small to cause, should be replaced with large capacity level relay.
( 6) if the contact pressure is not enough, should adjust or replace the spring to increase the pressure of the spring. If the pressure is not enough, should be replaced with contact.
3 intermediate body maintenance
( 1) the time relay, which is mainly airbag. The common fault of the delay allowed. This may be due to airbag sealing or leak, the delay is shortened, even without delay; may also be an air channel blockage, make action delay variable length. Repair, the former should be reassembled or replacement airbag, the latter should be opened to the gas chamber, clear the blockage.
( 2) the speed of the relay, the bakelite pendulum rod belongs to the middle of body. Such as when reverse braking motor can not brake stops rotating, it may be bakelite pendulum rod fracture. Maintenance should be replaced.
The above information by the country electric switch factory for you, www.jiandq.com