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About Us Emotron - crane drives with frequency inverters Company Emotron has been dealing with application of frequency inverter on crane drives since During this time already has been developed several type ranges of frequency inverters equipped with special crane software. Thanks to longtime experience Emotron AB belongs among the world top companies in this field.
These inverters are always equipped by the Crane set 2. Frequency inverters in this configuration operating as autonomous controlling system of crane drive. That means, that except of standard functions of speed control ensuring logical links of inputs, brake control and control the status of the drive.
Advantages of crane drives with frequency inverters: Not only big energy saving, but also savings in term of mechanical part of drive wear-gears, brakes, and also as crane itself. Continuous speed control from 0 up to maximum without reduction of motor torque.
Continuous diagnostics of motor. All operating parts controller, limit-switches and end-switches etc. Thanks to crane card CRIO 2. Possibility of application with original slip ring motorsu. High safety of operation. The right design of complete crane drive gear - brake - motor - inverter is the first step for safety function of crane drive.
The direct torque control of inverters, give the maximal starting torque with optimal magnetic flux of motor. Integrated current control, with low frequencies gives maximal load with zero speed of motor. Special crane software gives the opportunity optimal control the brake.
Brake is switch-off immediately when any trip comes from inverter or motor or from any other part of crane acc. Special applications Non-tensional regulation: elimination of bridge crane seizing. Grab crane control. Synchronous operating of two cranes. Examples of crane applications, see Reference list. It happens mainly when there is a big crane span or low crane stiffness or in cases of unbalanced load of crane.
Underestimate of this problems want to threaten the safety operation. ESK system with frequency inverter prohibits the seizing of crane and extending the lifetime of crane wheels and rail and increasing the safety and reliability of crane. If this system is optimally designed, then the moving of crane is smoother, steady and without contact between wheel flange and rails. How it works?
Electronic flanges system is made from three basic parts: 1. Measuring distance sensors 2. Regulation PLC 3. The regulation circuit PLC processing all four signals and determine the optimal axis of movement. This principle looks very simple but there are any other terms which are important too. Speed of right and left motor are controlled with frequency inverters by the output signals of regulator.
It makes possible the independent speed control. Technical realization The measuring system wants to works with any type of sensor.
But the best is to use ultrasonic sensor because it is able to work in the extreme operation conditions and it has very good characteristic. The keyboard and display are used for commissioning of the complete system.
All signals and measured values are monitored and it is possible to arrange their simulation. Grab control with frequency inverters Description This electronic control is determined for four-grab dredger with two drives. It coordinates the cooperation of both drives.
For grab operating are four basic commands necessary: grab - up mostly 4 steps grab - down mostly 4 steps grab - open grab - close All these commands are entered directly by the joystick and it is possible to arbitrarily combine all this functions.
When the grab is only partly open then it is possible to hoist or it directly in this status. Internal positioning regulation controlling that both means bearing and closing ropes will always in right ratio.
Both drives can be operated separately but positioning regulation and synchronizing of drives is switched off. After the end-positions was set-up, then is the grab ready to the test operation during which can be completely commissioned all drives.
This process should be repeated only when there were any mechanical changes on grab or after a long operation time. Balancing the load moments of both lifting gear Synchronous regulation of both drives provides that share of load torques of each drive during operation will equal. Digging automationu The grab must to know to take on the material. There is used the self weight of grab for take on the material.
The ropes of both drives are heave in with the same differential torque. It is why the closing drive when grab is closed during hoisting must be operated with higher torque than bearing drive. Automatic transition from closing to hoisting For optimal time sequence of grab operation is required that hoisting of grab must start immediately after material take-on. When the grab-close command come at the same time as grab-hoist command then the grab start with hoisting immediately.
But it is possible to set this commands for hoisting with not fully closed grab. Them the grab start with slow hoisting and after the fully closed grab it accelerate to maximal speed. It handles the minimal mechanical jerks during acceleration. Display of trip status The trip statuses could happen during operation of grab crane. The cause of trip you want to read on inverter display or on the power panel display. It contains from several lines display and keyboard. The display shows an actual data of both drives.
The Set-Up menu is activated by pressing of F2 key and setting the password. CRANE 2. The communication and the complete controlling of the crane drive are made by CRIO card. It coordinates the co-operation of input commands with signals which are used for controlling of inverter motor. Instead of three basic speed control methods 4-speed controller, 3-position controller and analogue control there are inputs for pre-limit and limit switches and two relay outputs which are used as no-trip and brake control.
The benefits of the CRANE option are: fast reversing, operation with two parameter sets, special braking modes etc. By this is possible to work directly with standard crane control voltage VAC. This solution fully eliminates the possibility of signal interference and it is very important when the inverters are used. The Enoder 2. The IRC sensors are mainly used with hoisting crane drives or drives which must to cooperate in synchronous mode, e. It is possible to make the hoisting crane drive without the Encoder2.
It is mainly the handling cranes when the accuracy of hoisting is very important e. Please contact your supplier when you are not sure if you need Encoder or not.
It depends on many aspects.
Samukazahn Contact us Contact us. Encoder A HTL or TTL pulse encoder can be connected for more accurate speed control or for increased safety through deviation control in crane applications. Four different options can be combined. Welcome to stand B Your process is protected from damage and downtime, and you will benefit from reduced installation, energy and maintenance costs. Integrated vector braking ensures quick and controlled stops, increasing not only productivity but safety as well.
Emotron - crane drives with frequency inverters