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CRABster Winch Trolley
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FAQ
Under normal circumstances, it is not allowed. Above 60Hz (there are also modes above 50Hz), with constant voltage, it generally has a constant power characteristic. When the same torque is required at high speeds, attention must be paid to the selection of the motor and inverter capacity.
Power can still be output below 6Hz, but depending on conditions such as motor temperature rise and starting torque, the minimum operating frequency is set around 6Hz. At this point, the motor can output rated torque without causing serious heating issues. The actual output frequency (starting frequency) of the inverter varies by model, ranging from 0.5 to 3Hz.
When the frequency decreases, the voltage is reduced in direct proportion. Since the AC impedance decreases while the DC resistance remains unchanged, this will tend to reduce the starting torque at low speeds. Therefore, at low frequencies, to achieve a certain starting torque, the output voltage should be increased somewhat when V/f is given. This compensation is called enhanced starting. Various methods can be used to achieve this, including automatic methods, selecting V/f modes, or adjusting potentiometers.
When the frequency decreases, the voltage V also decreases proportionally. This issue has been explained in answer 4. The proportional relationship between V and f is predetermined considering the motor characteristics, and several characteristics are usually stored in the controller's storage device (ROM), which can be selected using a switch or a dial.
Using a frequency converter for operation, the frequency and voltage increase correspondingly with the acceleration of the motor, and the starting current is limited to below 150% of the rated current (depending on the model, it can be 125% to 200%). When starting directly with a power frequency supply, the starting current is 6 to 7 times higher, which can cause mechanical and electrical shocks. Using a frequency converter allows for a smooth start (the starting time is extended). The starting current is 1.2 to 1.5 times the rated current, and the starting torque is 70% to 120% of the rated torque; for frequency converters with automatic torque boost function, the starting torque can exceed 100%, allowing for full load starting.
When the frequency decreases (low speed), if the output power remains the same, the current increases, but under the condition of constant torque, the current remains almost unchanged.
The torque of the motor is generated by the interaction between the magnetic flux and the current flowing through the rotor. At the rated frequency, if the voltage is constant and only the frequency is reduced, the magnetic flux becomes too large, the magnetic circuit saturates, and in severe cases, it can burn out the motor. Therefore, the frequency and voltage must change proportionally, meaning that while changing the frequency, the output voltage of the inverter should be controlled to keep the magnetic flux of the motor constant, avoiding weak magnetism and magnetic saturation phenomena. This control method is often used in energy-saving variable frequency drives for fans and pumps.
The main circuit of the inverter can be roughly divided into two categories: the voltage type, which converts the DC of a voltage source into AC, with the filtering of the DC circuit done by capacitors; and the current type, which converts the DC of a current source into AC, with the filtering of the DC circuit done by inductors.
Product Introduction
Product Detailed Introduction:
CRABster Winch Trolley, Maximum Load 250T
• Precise and safe operation
The electronic monitoring unit NovaMaster comes with electronic overload protection, variable frequency lifting, closed-loop control, and the lifting motor is equipped with a rotary encoder, allowing for stepless speed regulation.
• Excellent space utilization with evenly distributed wheel pressure
Compact design with optimized limit dimensions, no horizontal displacement of the hook head.
• Multiple optional features
Designed based on standard components, can be supported by CraneMaster software for selection.
• Low maintenance costs and shortest downtime
The newly designed pulley and rope winding system reduce wear on the steel wire rope, with a design that facilitates centralized lubrication. Each specification shares the same lifting motor, lifting reducer, and lifting frequency converter.
Advantages: Extremely high efficiency and optimized usage space
• Maximum load 250T
• Four specifications
• Individual winch trolley or complete crane component package
• Double beam or fixed type
• Vertical lifting design
No horizontal displacement of the hook head.
• Compact design
• Optimized limit dimensions
• Stepless variable frequency speed regulation during operation
• Ambient temperature from +5 °C to +40 °C
Design and Production Capabilities:
• Sturdy rope guide made of cast iron material
• 4-level upper and lower cam limit switches
• Ultra-high limit switch for extra safety
• Electronic monitoring unit NovaMaster
• 2-stage trolley limit position limit switch
• Trolley speed variable frequency stepless speed regulation
• Lifting motor with rotary encoder, variable frequency stepless speed regulation for lifting speed, closed-loop control.
• Overheat protection switch for lifting and trolley operation motors
• Heavy-duty design
• "Plug and Play" type trolley electrical box
• PLIOTEX marked wire number
• Trolley electrical box with built-in lighting and external 230V power socket
• 108 decibel horn
• Protection level IP55
• Epoxy resin paint, 120 μm
Options:
• Radio remote control
• Trolley maintenance platform
• Centralized lubrication system
• ESR function that automatically increases lifting speed under light load
• Second lifting brake
• Hook with sheep horn
• Rope guide pressure roller
• Trolley guide wheel
• Trolley electrical box and motor moisture-proof heating device
• Trolley electrical box air conditioning
• Stainless steel trolley electrical box
• Rain cover
• Under-bridge lighting
• Horn, 120 decibels
• Trolley and small trolley derailment prevention device and storm buckle
• Ambient temperature -20 °C to +60 °C
And more...
Highly recommended:http://www.swfkrantechnik.com/cn/products/electric-wire-rope-hoists/crabster-winch.html
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Service Hotline
Manufacturing address：intersection of Caibin West Street and Deren Road in Changchun China-Korea (Changchun) International Cooperation Demonstration Zone
Service Address：No.3 Fumin Street, Lvyuan District, Changchun City
Website：www.兴泰起重.中国
www.crane-china.cc
WeChat service number： xingtaiqizhong
Zip Code：130012
Sales Advisory Phone：400-044-6608/13578886608WeChat Synchronization (Mr. Zhang)
After-sales service telephone：18343082566(Mr. Yu)/400-044-6608
Landline：0431-87096377
Fax：0431-87096377
Copyright：Changchun Xingtai Crane Machinery Co.,Ltd