Commonly used automatic compensation step-down starting cabinet do you know

Automatic control to start the occasion when needed, often USES XJ01 type automatic startup compensator, which is mainly composed of autotransformer, ac contactor and intermediate relay, time relay and control buttons, etc. XJ01 type automatic startup compensator principle: put through power supply, light Ⅰ on, press the start button SB1, KM1 coil electricity, KM1 main contact closure, motor step-down start. KM1 closed self-locking, light Ⅱ on. Ⅰ KM1 normally closed contacts disconnect, lights, KT electric, the normally open contact time closing, KA coil electricity, normally closed contact KA disconnect, KM1 blackouts, KM1 normally open contacts disconnect. Normally open contacts KA closed at the same time, KM2 coil electricity, KM2 main contact closure, motor run full pressure, KM2 normally open contact closure, light Ⅲ on. Circuit SB3 button for manual operation button directly, it is used when the time relay failure cannot be automatically put into operation, can press the first button SB1 automatically such as motor at rated speed near the synchronous speed, namely the ammeter pointer gradually decline to close to the rated current of the motor, the SB3 button again, and make the motor in operation. This distribution can be controlled. 14 ~ 75 kw three-phase asynchronous motor. In the circuit fuse, thermal relay and motor and transformer capacity should also be used. In 90 ~ 115 kw motor, can use XJ011 series automatic control since the coupling type decompression starting cabinet, circuit principle of work. When used to pay attention to the following points. 1, when installation, from the bottom of the power cord, motor load through, L1, L2, L3 calibration line power supply or circuit breaker on pile head, MA, MB and MC answer the three-phase motor. 2, start the cabinet for remote operation, according to the circuit diagram of SB1 & prime; SB2′ , which leads to the connection. 3, start the ark general startup time is 10 ~ 20 s. If the motor capacity is larger, the load is heavier, the startup time can be adjusted to 25 s. Time relay can be adjusted within 0 ~ 60 s, according to the need to adjust the time to start the motor. Thermal relay should be according to the rated current value of the motor rated current setting. 4, in the process of using the power distribution cabinet, such as thermal relay misoperation, the action of thermal relay current can be properly adjusted a bit bigger; If overload operation happened, need to press the thermal relay & other; Reset & throughout; Button, can continue to use. Distribution during the period of using, often should remove dust, and regularly check whether the electric contact parts contact is good, have a problem to repair in time. 5, XJ011 series auto voltage reducing startup ark before use 500 v megohmmeter traverse over the ground resistance is not less than 1 m & Omega; , each contact and will tighten. 6, autotransformer with 65% and 80% of the rated voltage second tap, in the application can be used according to the size of the load to determine the location of the tap. 7, contactor at work, if there is any noise or delay release phenomenon, armature extremely area of dust or oil dirties rub-up, namely can resume normal. 8 the distribution cabinets, overhaul, check the contactor contact singeing phenomenon. Such as contact singeing, applied fine cut file will contact light. Large power distribution cabinet initiating device also can be made by an electrician. First generally available Angle steel and iron welded the cabinet of a certain size, then according to the size of the power of motor rated capacity enough contactor, circuit breaker, autotransformer, transformer and thermal relay, when installed power by down, namely on pile head to connect power, under the pile head load. Power supply and have enough space, the autotransformer metal shell, power distribution cabinet pan and motor metal shell separately with earth wire connected together and grounding, in order to ensure safe operation of electric. Assemble line. Its working principle is: when it starts, by the five main contact contactor action first, turn on the autotransformer, then passed the autotransformer step-down power supply, supply motor M start, stay almost reaches the rated speed of the motor itself, speed time relay action, make start the contactor release, after release run through intermediate relay contactor KM2 coil circuit connected, so that the 380 v voltage directly by running the contactor of M, and access to a motor start over. Element KA is short, so as to avoid thermal relay misoperation caused by the start time is too long: when it starts, by the normally closed contact point thermal relay of fever. After the start, KA action the thermal relay in operation. Power of the larger motor and form a complete set of power distribution cabinet can be applied to meet the requirements of start, 75 kw motor starting circuit of power distribution cabinet. The startup devices have the functions of automatic operation and manual operation. Automatic operation, close the power switch, the green light is lit, press the button switch SB1, KM3 and time relay KT electric absorption, at the same time KM3 normally open contact closure, KM2 also suck, loosen the button SB1, KM3 self-locking contact continue through to KM3, KM2, KT coil circuit, keep continue to suck. And through a power supply voltage is connected to the motor after autotransformer step-down starting motor step-down, after a certain time, KT time relay action, make the KT delay normally open contact closure, intermediate relay electric absorption merger self-locking KA. KA and off, disconnect the electricity coil KM3, KM2, KT to reset the they release, after KM3, KM2 release at the same time, its control normally closed contact closure, connect KM1 contactor, KM1 contactor input motor running state, motor running under full pressure. At the same time yellow light, Start the lights) To put out, the red light, Running lights) Bright. When need to stop the motor running, can press the stop button SB2, motor or stop working.