Speed regulating motor, controller 1 part of fault controller panel have speed indicator knob, tachometer calibration potentiometer reaction potentiometer, power supply safety, light, etc. These devices present failure more easily, also can help the discriminant of failure. (I gather speed control knob, no dc voltage output: such as the light is not bright, is the power of glass tube safety fuse; Indicator, typically silicon controlled burn, damage to the unijunction transistor, open circuit, speed control potentiometer touch bad, pulse transformer, etc. , among them with potentiometer, damage to the SCR, the most common. (2 regulate speed control knob to the limit, speed is still short of rating: this is caused by the negative reaction too deep, can be & other; Reaction calibration & other; Potentiometer counterclockwise self-care. On the other hand, if the supernormal speed, can be recuperated the potentiometer clockwise. (3 do not tally with the actual speed indicating value: regulate & lsquo; Speed calibration & lsquo; Potentiometer, until the indicated value and the actual speed. (Repeatedly burning power safety: if the disconnect the load (Connected to the light bulb a false load)Still have this phenomenon, the most common is the fly-wheel diode breakdown, SCR breakdown, etc. Part 2, electromagnetic separation device fault this section fails, the consequences are more serious overhaul is trouble, often lead to damage of exciting winding, the controller accumulation and dispersion of mechanical damage or hard wear, etc. A fault has often present: (1)Motor can only high-speed operation, regulate speed control knob speed without change, and even shut off controller, driven shaft them constantly: general is the armature and pole caught his air gap in the foreign body or bearing severe damage of grinding, make the armature or pole offset and touch each other. This kind of phenomenon in dust larger cement plant is the most common. Dust of shooting, gathered between the armature and the magnetic poles, overnight after downtime may be both extremely & other; Adhesion & other; Up, disable separation speed and driven shaft and drive shaft rotation. (2)Within the controller SCR or fuse often burn out; Common is exciting winding grounding, turn-to-turn short circuit or tachogenerator break line, etc. Grounding, break all good view, turn-to-turn short circuit is relying on the instrument, measuring the dc resistance, with normal again,30 ~ 980)Comparison. (3)Speed periodic shake phenomenon: at this time will be two excitation input line reverse connection, can solve the problem. Electromagnetic speed regulating motor fault handling: 1, the controller power supply and motor power to meet in together, with a stop of the motor on and off, lest the main motor stops after the exciting current is still on the winding and cause fever, burn out; 2, electromagnetic speed regulating motor shall be horizontal, vertical installation is easy to make the bearing damage in accumulation and dispersion and pole with armature contact; After 3, stop, speed knob should be set to zero, in order to avoid the restart of equipment occur rigid impact, also conducive to growth, gradually reduce motor starting current is too large resulting from mechanical failure may; 4, downtime, should often clean the dust and foreign bodies inside machine; After 5, with a long time without downtime, should before enabling the detection field winding insulation resistance to earth, with more than a 38 m2 advisable, otherwise to be boring.
