Product Description

SINEE EM630 high-performance Special VFD Inverter speed variator for tower crane
•Closed-loop vector control; low-frequency large-torque stable operation: 0Hz/150% steady output of the rated torque to ensure stable operation of lifting equipment in the process of starting, lifting, and lowering. 
•Zero-servo function: With an encoder connected, the inverter can drive the motor to hold the full load in the air or to lower the full load at a controlled low speed when the brake fails, providing additional protection for lifting equipment. 
•Over-speed protection: With an encoder connected, the inverter can provide protection against parking or running at an excessive speed, so that any abnormality in speed and braking power during lifting can be timely identified to prevent hook slips. 
•Special control logic for brake: It controls the brake of lifting equipment to open and close in a reasonable time sequence so that safe operation of the system can be guaranteed and the service life of the braking system can be prolonged. 
•Wide voltage input range with automatic voltage stabilization: it can still meet the torque output requirement CZPT voltage drop of the power grid; 
•Wide speed control range: it can meet the requirements of lifting light loads at high speeds and lifting heavy loads at low speeds to improve the working efficiency of lifting equipment. 
•Tower crane slewing algorithm: it can ensure no shaking of the tower crane slewing mechanism during operation, reduce the risk of speed overshoot, reduce the current during slewing at variable frequencies, and improve the operating efficiency. 

Product Description

Product Parameters

Item Specification
Power supply Rated voltage of power supply Three-phase 380V-20%~415V+20%, 50~60Hz±5%, voltage unbalance rate<3%
Output Maximum output voltage The maximum output voltage is the same as the input power voltage.
Rated output current Continuous output of 100% rated current
Overload capacity of heavy-duty type  150% rated current: 60s; 180% rated current: 10s 
Overload capacity of super heavy-duty type  150% rated current: 60s; 200% rated current: 3s 
Basic control functions Driving mode V/F control (VVF);
Speed sensorless vector control (SVC)
Speed sensor vector control (FVC)
Input mode Frequency (speed) input, torque input
Start and stop control mode Keyboard, control terminal (two-line control and three-line control), communication
Frequency control range 0.00~600.00Hz
Input frequency resolution Digital input: 0.01Hz Analog input: 0.1% of maximum frequency
Speed control range 1:50 (VVF), 1:1000 (FVC) 
Speed control accuracy Rated synchronous speed ± 0.2%
Acceleration and deceleration time 0.01 s to 600.00 s / 0.1 s to 6,000.0 s / 1 s to 60,000 s
Voltage/frequency characteristics Rated output voltage: 20% to 100%, adjustable; fundamental frequency: 1Hz to 600Hz, adjustable
Torque boost Fixed torque boost curve, any V/F curve optional
Starting torque 150%/1Hz (VVF), 150%/0.25Hz (SVC), 150%/0Hz (FVC) 
Torque control accuracy ±5% rated torque (FVC)
Self-adjustment of output voltage When the AVR function is enabled, the output voltage remains basically the same as the input voltage changes 
Automatic current limit Output current is automatically limited to avoid frequent overcurrent trips.
DC braking Braking frequency: 0.01 to maximum frequency  Braking time: 0~30S 
Braking current: 0% to 100% of rated current
Signal input source Communication, multi-speed, analog, high-speed pulse, etc.
Input&Output Function Reference power supply 10V/20mA
Terminal control power 24V/200mA
Digital input terminal 7-channel digital multi-functional input terminal
Analog input terminal 3 (standard AI1 to AI3) + 1 (extension card AI4) analog inputs:
One (AI1) voltage source: 0 to 10V input
Two (AI2/AI3): 0 to 10V input voltage or 0 to 20mA input current optional;
Digital output terminal 2 (standard Y1/Y2) + 1 (extension card Y3) open-collector multi-function outputs and 2 (R1: EA/EB/EC and R2:RA/RB/RC) relay multi-function outputs.
Maximum output current of the collector: 50mA; relay contact capacity: 250VAC/3A or 30VDC/1A, with EA-EC and RA-RC normally open and EB-EC and RB-RC normally closed
Analog output terminal Two (M1/M2) multi-function analog output terminals, with output of 0 to 10V or 0 to 20mA
Keyboard Display LED display The LED digital tube displays relevant information about the inverter.
Parameter copying Parameter settings of the inverter can be uploaded and downloaded for fast parameter copying.
Protection Protective Function Short circuit, overcurrent, overvoltage, undervoltage, phase loss, overload, overheat, overspeed, load loss, external fault, etc.
Use conditions Location Indoor, at an altitude of less than 1 km, free of dust, corrosive gases and direct sunlight
Applicable environment -10ºC to + 40ºC, 20% to 90% RH (no condensation)
Vibration Less than 0.5g
Storage environment -25ºC~+65ºC
Installation method Wall-mounted, floor-standing electrical control cabinet, through-wall
Protection level IP20/IP21 (450kW and above)
Cooling method Forced air cooling


Installation Instructions



Specifications W W1/W2 H H1 H2 D D1 D2 d Appearance 
EM630-4R0-3B 130 115/120 228 220 219 153 108 75 5  (b) 
EM630-5R5-3B 140 120/130 270 261 258 172 128 94 5
EM630-011-3B 180 150 368 353 343 210 165 136 7
EM630-571-3/3B 250 200 484 470 440 222 150 9 (c)
EM630-045-3/3B 315 200 560 546 513 250 180 9
EM630-055-3/3B 350 250 662 638 603 262 188 12
EM630-090-3 386 300 753 724 700 292 231 300 13 (d)
EM630-110-3 416 300 855 825 793 307 246 315 13
EM630-160-3 497 397 1107 1076 1036 340 285 348 13
EM630-220-3 656 450 1348 1314 1261 388 232 395 13
EM630-315-3 801 680 1417 1383 1330 388 190 395 13



Company Profile

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Application: Dedicated VFD
Output Type: Triple
Principle of Work: Vector Control Transducer
Switch Mode: PWM Control
Main Circuit Type: Voltage
Voltage of Power Supply: Medium Voltage Variable-Frequency Drive


Customized Request


What is a worm gear reducer?

The worm gear reducer is used to change the output speed of the mechanical device. It consists of worm and helical gears mounted on the input side of the equipment. In some cases, this gear reduction system can be multi-stage, enabling extremely low output speeds. It has the advantages of low energy consumption and low vibration.

Hollow shaft worm gear reducer

Worm gear reducer is an effective device to reduce the speed of mechanical equipment. The use of hard steel or non-ferrous metals for the worm increases its efficiency. Worms made of hard steel generate more heat than worms made of mild steel. Different thermal expansion results in gaps between mating surfaces. Despite its many benefits, worm gear reducers are prone to oil leakage, which can be a problem for a number of reasons.
Hollow shaft worm gear reducers are available in different gear ratios and are compatible with many motor types. Some are available in dual-axis and single-axis configurations and can be mounted horizontally or vertically. They are also available in intermediate ratios, as well as four- and five-speed transmission types. They can also be connected with additional output shafts.
Another type of worm gear reducer is the multi-stage variety. This gear reducer has multiple stages, enabling it to reduce speed with extremely low output speeds. In addition to the large transmission ratio, the multi-stage gear reducer has low noise, low vibration and low energy consumption.
Worm gear reducers offer space-saving solutions as well as increased torque. Agknx Gearbox offers worm gear reducers that solve common deceleration problems. The company has also expanded its product range into the bathroom market. Compared with the standard gearbox, the worm gear reducer has the characteristics of lower price and better torque output.
hourglass worm gear

The hourglass type worm gear reducer has multi-tooth line contact and is widely used in heavy machinery. These gears are characterized by a high load-carrying capacity, but they are highly sensitive to misalignment and manufacturing errors. However, by employing point contact, these gears can be made more reliable and can withstand higher loads.
Another major advantage of the hourglass worm gear is its high load capacity. The tooth profile design of the gears has a high relative slip ratio, which improves efficiency and load capacity. In addition, the large angle between the sliding direction and the contact line provides a low coefficient of friction. The hourglass worm gear also features premium carburized steel and phosphor bronze castings for exceptional durability. In addition, the tooth profile is very precise, the operation is quiet, and the speed fluctuation is small.
Agknx worm gear reducers are designed to operate for up to ten hours per day with an even load. The design of this worm gear reducer stems from Sumitomo Heavy Industries’ extensive experience in gear reducers. The smooth surface texture and precise tooth profile of the gears ensure that the gears can withstand high loads without damaging the lubricant film. In addition, Agknx worm shafts are specially designed to have the right stiffness.
Hourglass worm gear reducers are designed to maximize load capacity while minimizing energy consumption. Its fully meshed teeth reduce surface pressure on the worm gear teeth and increase load capacity.
worm_reducerDouble throat worm gear

There are a few things to consider when choosing a dual-throat worm gear. First, the diameter of the root circle must match the circle pitch of the larger gear. This measurement is usually done by measuring the distance between adjacent teeth. Alternatively, the worm’s normal module can be used. It is the value entered in the worm module dialog. In addition, the axial pitch of the worm should be equal to the pitch diameter of the circular pitch.
Double-throat worm gears are an excellent choice for heavy and heavy-duty applications. The design of this worm gear is ideal for heavy-duty applications as it provides a tighter connection between the worm and the gear. It is also more compact than other types of gear and is comparable to a fine-pitch lead screw.
The efficiency of a double-throat worm gear depends on the material of the gear and worm. Typically, gears are made of case-hardened steel, while worm gears are made of bronze or cast iron. In some cases, a combination of cast iron and bronze can be used.
The deflection of the worm shaft is also affected by the tooth parameters. Tooth height, pressure angle, and size factors all affect the deflection of the worm shaft. In addition, the number of worm threads is another important parameter that affects the deflection of the worm shaft.
Double-throat worm gears are commonly used in industrial applications where high drive reduction is required. The worm has a concave and internal tooth structure that can be adjusted to achieve various ratios. Worm gears and worm gear assemblies must be properly mounted on their shafts to prevent back drive.
Brass worm gear

The basic working principle of the brass worm gear reducer is the same as that of the traditional worm gear reducer. Its axial pitch must be equal to the circumferential pitch of the larger gear. The single-thread design advances one tooth per revolution, while the double-thread design advances two teeth. The threads on the worm are either left-handed or right-handed. The lead of a worm is the distance a point on the thread of the worm moves in one revolution. The lead angle is the angle tangent to the pitch of the cylinder and the axis of the worm.
Double-thread worm gear reducers are best for heavy loads. It provides the tightest connection between the worm and the gear. Assembly of the worm gear requires precise mounting. The keyway installation method involves drilling a square cut in the gear hole. This prevents the worm from rotating on the shaft and helps transmit torque. Then use the set screw to secure the gear to the hub.
The large fuel tank helps keep the worm gear clean and reduces heat. It also provides lubrication for extended life. Worm gear reducers with oil reservoirs provide a lubricated environment and low-friction surfaces. Additionally, it offers multi-position installation flexibility. Additionally, its housing is cross-milled for precise alignment. It also features internal baffles for leak-free ventilation.
I260 series worm gear reducers are one-piece iron casings with solid or hollow output shafts and tapered roller bearings. This gear reducer is designed for low to medium-horsepower applications. This gear reducer is a cost-effective option with low initial cost, the high gear ratio, and high torque in a compact package. Also, it is more shock resistant than other gear reducers.
worm_reducerBrass worm gear

Brass worm gear reducer is a reduction gear. This type of gear can provide a lot of reduction in a small package. This type of gear reducer also has the ability to generate high torque. However, it is important to understand that this gear reducer has thermal limitations, which reduce its efficiency. The choice of lubricant for this gear reducer is very flexible. However, being a yellow metal, it is important to remember that the lubricant must be non-reactive.
Worm gears are used in many consumer and industrial applications and have high reduction ratios. These gears are produced in various configurations and sizes. Worm gears are similar to spur gears but have non-parallel shafts. Worm gears are also suitable for applications requiring low output speed but high torque.
Worm gears have some distinct advantages over other gears. First, unlike standard gears, the worm rotates in a worm-like motion. This mechanism prevents reverse movement. This is because the lead angle of the worm gear is small. Additionally, the worms self-lock, helping to prevent reversal. However, this mechanism is not entirely reliable. Worm gears can be found in elevators, fishing reels, sprockets, and automotive power steering.
Another advantage of worm gears is that they are easy to manufacture. The rationale behind this design is to have two mutually perpendicular axes. Then, two or more threads are added to the worm gear. The common tangent between these two shafts intersects the pitch line of the worm gear shaft. This is the basis of transfer speed.

China Best Sales Sinee Em630 High-Performance Special VFD Inverter Speed Variator for Tower Crane   with Great quality China Best Sales Sinee Em630 High-Performance Special VFD Inverter Speed Variator for Tower Crane   with Great quality
editor by CX 2024-04-04