Plc And Frequency Converter With Synchronous Control Crane Trolley Read more: http://www.articlesbase.com/human-resources-articles/plc-and-frequency-converter-with-synchronous-control-crane-trolley-3375560.html#ixzz1Rhk5pOnF Under Creative Commons License: Attribution No Derivatives

Abstract  Article on multi- Motor Speed synchronization control of a brief analysis
and a systematic introduction to PLC and frequency conversion technology in
gantry Crane Application of synchronous operation control car and control the
outcome.

Keywords  Crane speed synchronization control PLC Converter

In the traditional transmission, the number of implementing agencies to ensure 
the speed synchronization control, often connected by rigid mechanical drive 
unit to achieve. But when the input power requirements of the implementing 
agencies large or the distance between the implementing agencies, the
 independent control can only consider the transmission of non-rigid connection
 means that the multi-motor synchronous drive. However, synchronous drive
 system, because the system is affected by many factors, all parts will have 
different degrees of volatility, speed deviation from the normal value, resulting
 in the system are not synchronized. This can range from damage to the device,
 while in causing Personal safety Accident. Synchronous speed control 
so practical engineering significance. Here we introduce a more advanced 
synchronization control method, namely the use of PLC and frequency converter
 speed synchronization between the two devices.

1 of the problem Gantry cranes operating devices were powered by high-power
AC motor drive, run devices Electric motor Through the coupling, reducer drive
shaft and wheels, so that along the orbit. Manipulation to the entire crane
gantry crane running along the track known as the cart to run some institutions.
 Also, make crab laid in the main beam along the orbit is known as trolley body parts
. If the larger tonnage of car lifting, must use two four-wheel drive car,
can be used both on the track on both sides,
 into the diagonal layout of the motor drive (Figure 1). However,
the two transmission connection is not rigid, when the system start,
 or transmission gap inequality,
when the brakes are different elastic adjustment will result in two active
wheel speed can not be synchronized, Er Shi body to reverse, resulting in
 "derailment" phenomenon seriously affects the safe use of cranes and
 may even result in the risk of derailment.

2 Implementation Order to achieve the two speed synchronous traction motor,
 the inverter can be used two YZR160M1-6/7.5kW traction motor, then use
converter for speed control, and then PLC direct control of the two inverter .

In the closed-loop control to the speed of a traction motor target speed,
 the traction motor inverter 2 to adjust its speed to track the speed of
traction motor 1. The two incremental rotary encoders and motor coaxial
 connection. Then the encoder 1 and encoder 2 were collected from the
two motor speed pulse signal, and sent to the PLC high speed counter
 mouth or connected to the CPU, IR00000 ~ IR00003. These two speed
 signals control the amount of data as input, for the ratio?? Integral (PI)
 control algorithms, computational results as the output of analog signal
service module PLC to control the traction motor inverter 2. Therefore,
 we can ensure the speed of traction motor 2, a traction motor speed to
track changes in change. To keep pace and avoid the two speed
 "crawl track" phenomenon.

Collected from the pulse encoder signals into motor speed data, 
after the next treatment after storage in a DM area, as computing the Y value.
 After calculating the P value, sent to analog output channel, 
through upper and lower limits, 
after calibration, 
converted into frequency converter can accept current or voltage signal to 
control inverter traction motor 2.

In addition, the work site there are several sets of high power cart drive motor.
 Therefore, in order to reduce power supply system caused by external factors,
 such as interference, we designed the PI control algorithm,
 we must consider using integral part of I to eliminate the accumulated error.
 Thus, a traction motor and traction motor 2 can be good for high precision
 synchronization and synchronization to ensure the stability of running organizations.

3 Control result Compiled PLC PC using VB Monitor Program, acquisition
speed value and draw curves, data extraction time interval 15ms.
Figure 4 is the speed of traction motor and traction motor 1, 2, the relationship
 between the speed curve. Curve with the car running in real time changes.
 In fact a traction motor and traction motor 2 speed is the same,
but in order to reflect the traction motor 2, the tracking and volatility,
we are conscious of their separation, the above is the traction motor speed curve 1,
 the following is the traction motor 2 speed curve .

The speed of a traction motor change,
the traction motor 2 will be able to respond in a timely manner,
 tracked, and achieve stability soon.
 Experiments show that the PLC and inverter control method can achieve
high synchronization requirements, fast response speed of less volatile.

4 Conclusion

This control scheme has been designed in the 40-ton gantry crane to
 get application. From the operation point of view,
 obvious effect car starting synchronization, run smooth, essentially overcoming the
 "climb-rail" phenomenon. With the variable
 frequency technology to expand the scope of the use of PLC technology to control,
 will better improve the transmission speed control on the reliability and flexibility.
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