MaxWell Medium Voltage VFD – Variable Frequency Drive for 3.3kV to 10kV Motors

Description

Features
1. Input current harmonics
Multi-pulse rectification using transformer phase shift technology, 30 pulses for 6kv systems and 48 pulses for 10kv systems.
Meets IEEE519-2014 standard.
Input filterless.
2. Input power factor
The input transformer phase shift technology combined with cascade modules provide the reactive power required by the motor with an input power factor of up to 0.96. After the motor has passed through the high voltage inverter, no reactive power compensation equipment is required.
3. Output voltage waveform
Module-cascaded technology, H-bridge inverter, module output superimposed to form multilevel, output perfect sine wave to ensure the motor work in better condition. It is adaptable to new and old motor.
4. Overall efficiency
Efficiency up to 97%, better electromagnetic design for phase shifting transformers to reduce losses, and IGBT uses international first-tier brand.
5. Grid adaptability
Output voltage fluctuation range -15%-+15%, frequency fluctuation -10%-+10%. Within the fluctuation range it ensures the output rated voltage by output injection harmonic control. It can work with the minimum voltage -45%. When the grid momentarily loses power, the high voltage frequency converter will enter the momentary power loss non-stop function to maintain the motor working, and if the grid is recovered before the system energy storage is depleted, the system will continue to work.
6. Lightning protection
The mains input, output, control power input and communication signals are protected against lightning.
7. Modular design
The control system, electrical system, power module, fan system and detecting unit adopt modular design, being highly reliable, easy to maintain and easy to operation.
8. All-in-one design
10KV 1-2MW, one design for the structure size in the power section, 10KV 1-2.25MW, 10KV 200KW-1 MW and 6KV 185KW-0.8MW. Small in size and space saving.
9. Low voltage soft-start function
The phase shifting transformer is switched to the grid on the high voltage side after the transformer has output a normal voltage by means of a low voltage soft start. The soft start ensures that the phase shifting transformer is switched to the grid without inrush current.
10. Control power
The power supply of the control system adopts a modular design and a dual redundant power supply, with one from low voltage and one from high voltage. The core memory chip inside the control system is powered by a super capacitor to ensure the operation of data storage when the system is powered down.
11. Multiple motor control options
Depending on the motor applications, VF control, vector control and direct torque control (DTC) are available to suit various motor loads.
12. Fault protection
Motor overcurrent protection, output overload protection, input overvoltage and overcurrent protection, phase shifting transformer overheat protection, communication fault protection, power unit fault, output short circuit protection, IGBT overcurrent protection, operation gate open protection, etc.
13. Rich user interfaces
It has interfaces for RS485, analogue input, analogue output, digital input, digital output, encoder input, power control,
power output, high voltage circuit breaker control and detection, emergency stop, etc. to meet a wide range of applications.
14. Power module design
Independent duct design, adaptable to various industrial applications. Interference-free fibre optic control signals. Module control adopts DSP digital control.
15. Master control system
DSP+FPGA architecture is used to complete motor algorithms, logic control, fault handling, SVPWM regulation, communication, signal processing and other functions to perform motor control accurately, quickly and reliably.
16. Interference-free switching technology
High-voltage frequency converter can achieve synchronous motor or asynchronous motor soft start, with motor starting from 0HZ and gradually running to the grid frequency of 50HZ. Then the motor switches from the frequency conversion state to the industrial frequency grid, with the switching process smooth and there is no impact current on the motor so as to ensure the safe operation of the motor.
17. Easy maintenance
With a modular design, each part is a separate module, and it only needs to handle the corresponding module during maintenance, allowing the ventilation dust screen to be replaced or cleaned under normal operation.
18. Highly adaptable to the environment
Protection class IP30; pollution class II. It meets start-up at -15℃ and can work at a maximum temperature of 55℃;
Storage and transport temperature -40℃to +70℃;
The complete machine passes the Class III road transport test;
Power module, control system, detection unit, electrical system and other modules pass the 0.6m drop test and vibration test.

Basic Parameters

Power Input
Input voltage	Voltage class 6KV or 10KV, output rated power is output when voltage fluctuation range is within -10%~+10%. Output power is derated within -45%~-10%.
Input frequency	50Hz，frequency fluctuation range -10%~+10%
Input current harmonic	THDI≤4%, meeting international standard IEEE 519-2014 and national standard GB/T 14549-93 power quality standard
Input power factor	Up to 0.96
Power output
Output voltage range	0~6KV or 0~10KV
Output frequency	0-120Hz
System efficiency	Up to 97%
Output overload	Work for a long time with the load less than 105%, and inverse time protection enables within 110% ~ 160%.
Output current harmonic	THDI≤4%, meeting international standard IEEE 519-2014 and national standard GB/T 14549-93 power quality standard
Control Mode
Control mode	V/F, VC control without speed sensor, VC control with speed sensor
Acceleration/deceleration time	0.1-3600S
Frequency resolution	Digital setting 0.01Hz, analogue setting 0.1 x set maximum frequency
Frequency accuracy	Digital setting ±0.01% max. frequency, analogue setting ±0.2% x set max. frequency
Speed resolution	Digital setting 0.01Hz, analogue setting 0.1 x set maximum frequency
Speed accuracy	±0.5%
Speed fluctuation	±0.3%
Starting torque	Larger than120%
Excitation braking	Braking time 0-600S, starting frequency 0-50Hz, braking current 0-100% of rated current
DC braking	Braking time 1-600S, starting frequency 0-30Hz, braking current 0-150% of rated current
Automatic voltage regulation	When the input voltage varies within -10% to +10%, the output voltage can be kept constant automatically and the rated output voltage fluctuates by no more than ±3%.
Machine parameters
Cooling method	Air cooling
Protection class	IP30
Insulation class for phase shifting transformers	Class H (180℃)
Local operation mode	Touch screen
Auxiliary power supply	≥20 kVA
Environmental adaptability
Ambient operating temperature	0~+40℃ It can start directly at -15°C, and capacity derates for use at 40°C to 55°
Ambient storage temperature	-40℃~+70℃
Ambient transport temperature	-40℃~+70℃
Relative humidity	5%-95%RH no condensation
Altitude	less than 2000m
Installation site	Indoor
Contamination level	Contamination level 3 and occasional conductive contaminants are allowed
User interface
Analogue input	3
Analogue output	2
Communication interface	2
High voltage circuit breaker control	1
Code plate interface	1
Relay type dry contact output	6
Transistorised dry contact output	4
Multi-functional terminal input	8
Power supply interface	380V AC

Model Specifications

MaxWell 6kV series
Models	Motor Power (kW)	Rated output current (A)	Weight (kg)	Dimensions (mm)
MaxWell-H0185-06	185	23	2030	185017702350
MaxWell-H0200-06	200	25	2049
MaxWell-H0220-06	220	27	2073
MaxWell-H0250-06	250	31	2109
MaxWell-H0280-06	280	34	2145
MaxWell-H0315-06	315	38	2187
MaxWell-H0355-06	355	43	2236
MaxWell-H0400-06	400	48	2363
MaxWell-H0450-06	450	54	2385
MaxWell-H0500-06	500	60	2410
MaxWell-H0560-06	560	67	2479
MaxWell-H0630-06	630	75	2609
MaxWell-H0710-06	710	85	2664
MaxWell-H0800-06	800	94	2773
MaxWell-H0900-06	900	106	2894
MaxWell-H1000-06	1000	117	3060
MaxWell-H1120-06	1120	131	3268
MaxWell-H1250-06	1250	144	3502
MaxWell-H1400-06	1400	161	3577

MaxWell 10kV series
Models	Motor Power (kW)	Rated output current (A)	Weight (kg)	Dimensions (mm)
MaxWell-H0220-10	220	17	2163	185017702350
MaxWell-H0250-10	250	19	2202
MaxWell-H0280-10	280	21	2241
MaxWell-H0315-10	315	24	2286
MaxWell-H0355-10	355	26	2338
MaxWell-H0400-10	400	29	2475
MaxWell-H0450-10	450	33	2505
MaxWell-H0500-10	500	36	2526
MaxWell-H0560-10	560	40	2600
MaxWell-H0630-10	630	45	2740
MaxWell-H0710-10	710	51	2799
MaxWell-H0800-10	800	56	2916
MaxWell-H0900-10	900	63	3046
MaxWell-H1000-10	1000	70	3225
MaxWell-H1120-10	1120	79	3848
MaxWell-H1250-10	1250	87	4100	262518952470
MaxWell-H1400-10	1400	97	4180
MaxWell-H1600-10	1600	110	4610
MaxWell-H1800-10	1800	124	4990
MaxWell-H2000-10	2000	138	5180
MaxWell-H2250-10	2250	154	5573