1.1 maintenance of asphalt mixing plant

(1) every six months with dry air or oxygen to mainframe computers, printers and clean;

(2) computer system as far as possible, do not force shutdown;

(3) periodically by standard weight of static accuracy test name; check for mechanical deformation caused by abnormal contact chengti;

(4) periodically blowing dust and tighten terminals.

1.2 analysis of asphalt mixing plant

(1) the symptoms: computer power on no display motherboard not start, video alarm sound (one long and two short tweets). Reason: is the video card is loose or damaged; approach: open the chassis and plug-it-video card. If it does not resolve the problem, equipment providers or professional computer companies will be considered;

(2) the symptoms: computer power on no display motherboard not start, alarm memory ("Didi" and called a stop). Cause: memory of alarm failure is more common, is mainly caused by memory-poor contact. The solution: open the chassis, removing memory, carefully with an eraser to wipe the memory of Goldfinger, plug, using hot-melt adhesive to fill memory slots on either side of the gap, preventing oxidation continues in use. If it does not resolve the problem, cross-vendor or professional computer equipment company;

(3) the symptoms: computer display resolution is only 256 colors, and does not display correctly. Failure reason: graphics driver problem solution: reinstall the video driver;

(4) symptoms: computer starts, run slow computers often crash; cannot make system restore failure: computer hardware damage or poisoning the system, file corruption problems; approach: use antivirus software on your computer for antivirus processing; if it does not resolve the issue, or professional computer equipment provider companies.

(5) failure phenomenon: in access management software tips "wait for a timeout" on your computer and cannot be manipulated. Analysis: computer communication failure with the PLC controller. Treatment method: check whether the communications socket on both ends loose unsoldering and communications, such as break; changing the communication port (COM1), plug the phone cable on COM2, and port settings in the management software. If it does not resolve the problem, cross-device manufacturer;

(6) symptoms: weight weighing instrument display instability (or hundreds of dozens of dividing float values). Fault reasons: by wiring box wet; sensor wiring pine off; sensor for bridge or signal and shield line resistance is small; sensor problem; said heavy instrument or put amplifier problem; processing approach: a. volume sensor for bridge or signal line and shield line resistance resistance size (normal several ten trillion Europe); b. check sensor wiring and the wiring box (wet drying); c. measurement said heavy instrument or put amplifier wiring end EX+ and EX-Zhijian of voltage (not is less than 9.8VDC); If output voltage is less than 9.8VDC, Remove sensor wiring, then again if it is less than 9.8VDC, description instrument damage, restoration or replacement of the weighing instrument; d. adjacent to the weight display of the weighing instrument interchangeable sensor wiring, judging instrument failure or sensor fault;

(7) failure phenomenon: weighing instrument weight: "OL" (overload), "-OL" (an open circuit). Cause: sensor wiring problem sensor problem weighing instrument problems. The solution: a. electrical measuring sensors for bridges, the signal wire, shielded cable resistance between size; check the sensor wiring loosening; b. adjacent to the weight display of the weighing instrument interchangeable sensor wiring, judging instrument failure or sensor fault;

(8) sensor fault judgement

A. resistance measurement method: measurement sensors for bridge, the size of resistance between the signal wire, shielded cable. This method is suitable for people who are clearly open circuit or short circuit sensor b. voltage measurement: measure the output voltage of the sensor signal, any sensor (sensitivity to 2mv/V) signal output voltage is not in the 0~20mv range, the sensor are deemed to have been damaged. This method is suitable for resistance measurement significantly damaged sensor c. screening method: this method is suitable for resistance measurement normal and abnormal signal output voltage sensor. From the sensor junction box terminals removed one of the sensor signal output wire, observe the weighing instrument weight shown is stable if the weight display becomes stable, so we can determine is broken sensor problem if weight is still unstable, remove other sensor signal output wire to the weight display becomes stable. Sensor signal output wire that will determine issues separately and then carefully observe, compare, confirm;

(9) failure phenomenon: mixer open the door when unloading; aggregate weigher and powder scale instrument sudden increases in weight display. Blender discharged material, instruments such as aggregate and powder weights display restorable. Analysis: Blender door pressure loss of balance causes a negative pressure issue. Check the exhaust pipe is blocked; increase the intake manifold solve pressure balance problems;

(10) failure phenomenon: weighing loads for the same amount of materials, weight is displayed in a blender or other scale of material and non-material inconsistencies; may result in additional or fewer ingredients, and report properly. Analysis: the soft connection of discharge gate too tight or mixture solidification. Regularly check and clean the discharge connection, guarantee the accuracy of measurement of ingredients;

(11) failure phenomenon: normal automatic production process, the report correctly, can produce actual weight of the concrete, which is more than statistics, but using standard weights to each scale are normal. Analysis: mechanical deformation (invisible to the naked eye), the resulting burden to a certain extent, scale normal contact with the actual ingredients of non-displayed value is greater than the weight value;

(12) the symptom: electric Bell without a PLC-controlled output; output of PLC control. Analysis: check for power inputs PLC; see PLC's RUN and the ERROR led is on if RUN is not lit and the ERROR indicator light must contact your equipment provider to handle.