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Installation and commissioning of electrical circuits
2017-02-07 【Print】 【Close

 First, the electrical circuit of the field installation wiring
First of all to understand whether the site is buried pipe or bridge. According to the engineer's electrical circuit layout map to find the scene of the end of each device line, check whether the location of the corresponding pipe equipment line end.
        Second, the electrical cabinet fixed in the field base, a number of cabinets will be parallel counters, installation bus row, the site console should be fixed.
        Third, a circuit wiring, it is best to route the same cable specifications. Many people like to start from the head of the device all the lines together, so that at the same time open the multi-roll cable, and each change a position to be a few volumes of cable together to move around, easy to get away. My proposal is to remove a volume of a cable, and then from the end of the entire equipment to the end of all the requirements of the same specifications of the electrical appliances to the cable layout, such as the same size of the motor fan, you can first set these lines , And then check to ensure that there is no omission, then the cable layout of this group with the specifications of the check. Then, the next group of the same specifications of the cable wiring, layout is also followed by the order. So that each time as long as the demolition of a specification cable, and a cable all the wiring is completed after the specification of the remaining cable can be stored and affixed to the identification card to identify.
        Fourth, clear the wiring sequence, the best place to line the first line, and then put a small line, first put a line, and then put the second line, first put the motor line, put other load lines, each cloth over a line It is necessary to do signs. The first line after the release line is the advantage of small cable trench or bridge, the big line will not crimping the small line. First put a line and then the benefits of the second line is a relatively small line can be completed as soon as possible the main circuit, and facilitate the second line of interference processing.
        The wiring sequence of the field is first carried out by the motor wiring, and then the following wiring is started: the wiring of the motor fan, the wiring of the heating resistance wire, the control point wiring in the control line, the hydraulic circuit, the wiring of the analog line such as the temperature sensor, Encoder line wiring, communication line wiring. So that we first solve the main circuit, and then solve the control loop of the switch wiring, we can in the next easily disturbed lines to find wiring measures, which can avoid the interference in the wiring phase.
        Fifth, on the wiring, we must first record each cable in which color or number corresponding to which terminal, then a record of a record, and the best specifications with the same unity, such as all the best for the motor line for the red green one-to-one UVW. It should be in a line after the end of all the cable and then connected to the load, and then the second line of wiring. The benefits of this are not confusing, especially in the case of many lines of live cloth. And can make the scene look refreshing, rather than like all the lines put a cable again in the scene so confusing. And a stage of wiring and wiring, you can make the installation of a stage of a stage of regular progress, rather than eyebrows beard a grasp.
        Second, the electrical circuit debugging methods
        Line wiring is completed, it is necessary to conduct line debugging to ensure that no error.
        First check the cable is not connected wrong, do not A motor cable connected to the B motor, A fan cable connected to the B fan, in particular, wear the same tube line. Control line with a cable, electrical cabinet terminal row on each terminal corresponding to the color or number and field operation point one by one correspondence, such as a button corresponding to the yellow line, and to the electrical cabinet terminals are connected to a green line, These should be carefully checked. Look at the motor and there is no short circuit, check whether there is a short circuit with the chassis, there is no open circuit, the button and the indicator line and terminal wiring is consistent with the circuit and so on.
        Second, we should first debug a circuit, should be an electrical cabinet of an electrical cabinet debugging. For example, the first electrical cabinet is all the motor circuit, you can push the switch, jog contactor, observe the motor has no reverse, if the reverse immediately changed over. And then try the second electrical cabinet, such as fan circuit, jog contactor to observe the fan has not reversed.
        Third, the debugging of all the buttons of the signal, and now a lot of control system buttons are access PLC, we can live one person press each button, another person in the PLC before the corresponding input indicator light is not bright, if not bright, find out the reasons. Solve the problem, make sure all the button signals are normal and the button light is on.
        Fourth, debug all the main circuit feedback signal, such as the first electrical cabinet of all the motor, we can move the contactor, check the signal has no feedback to the PLC, if not, then check the line. Observe the sampling signal has not been sampled, such as the current transformer connected ammeter, with a screwdriver to withstand the contactor to observe the ammeter there is no current indication.
        Fifth, the manual operation of the inverter, DC governor, check the motor there is no problem, there is no abnormal reducer, the motor encoder has no feedback. For example, this time we are debugging 590 DC governor. We made a simple small button box, one of the two switches used to activate a used to enable a potentiometer used to give 0-10V signal, we put this button box connected to the governor, and then you can The motor running debugging, and can be seen in the 590 encoder feedback signal. Such as a DC motor we try to speed when the error immediately, this is because the direction of the encoder feedback and the actual direction of the motor in the opposite direction, and the motor direction to determine yes, so we encode the A, B phase signal in turn normal The.
        Sixth, check all other feedback signal signal source can be normal feedback to the PLC. For example, an electrical, we use the transformer to sample the current signal to trigger the intermediate relay, the use of intermediate relay normally open signal feedback to the PLC this electrical work. We can use the screw to withstand the electrical contactor power, observe the corresponding PLC input light is not bright, to ensure that the feedback signal is no problem. For example, the scene of a position sensor, with the location of the mobile feedback of different resistance values, we can move the location, so that one person to measure the other side of the electrical cabinet line resistance value is a normal change to ensure that the resistance signal normal feedback, Problem caused by feedback error.
        At this point, the basic problem can be excluded one by one line, you can proceed to the next step PLC program debugging, the entire set of equipment linkage debugging.
        Summed up the contents of the above is the time to install the first time to put a line, put a line after the release of a cable to do a good job on the copper nose to take a good stage of a stage to complete; debugging time to check the line security, and then debugging Motor direction, and then ensure that the manual operation can be normal, the signal has feedback to the PLC or other controller. Step by step, thinking clear, find problems and solve problems, improve their ability to work.