5...1600 Sec (set according to the application / load)
Inputs & outputs switch signals
14 inputs / 22 outputs
-5...45 °C *
-40...70 °C *
Forced air cooling
<95 %, no condensation *
<1000 meter, when altitude is higher than 1000 meter, each 100 meter increasing needs 1 % derating of VFD
Non-conductive, no causticity, <6.5 mg/dm3 *
IP 30 *
RAL 7032 (can be customized)
*Please consult Amtech for the information beyond
the above table
Specification are subject to change without notice.
Axpert-Hivert Medium Voltage Drive Specifications
The Axpert-Hivert General Medium Voltage Drive supplied by Amtech is equipment for use with high voltage (synchronous or asynchronous) AC motor speed adjusting and driving. It has the following functions and features:
Self-innovated SVPWM control strategy has advantages of high control accuracy, fast response, and greater than 98 % VFD efficiency
Modular design of power cell, convenient to maintain
Wide input voltage scope meets the demand of power network
Power cells connecting in series topology and wave stacking method, well developed technique and reliable devices
AVR (automatic voltage regulator) function of output voltage prevents damage to motor isolation from over-voltage and reduces motor loss without load
Torque boost function, raises output voltage & output torque during low frequency running
Rotating speed (fly) start function, realizes the motor restart during rotating, meets continuous production requirement
Transient power loss function, inverse charging to ensure normal running when the network loss power in a very short time
Auto-start function of high voltage trip, suitable for working condition like dual power switch and voltage trip
Synchronizing switch function (optional), realize "no disturb" motor switch between network and variable frequency, reduces the impact to equipment and network
Power cell by-pass function (optional), automatically by-passes the fail cell without influencing the VFD operation
English HMI easy for operation
Besides above advantages, the Axpert-Hivert General Medium Voltage Drive has the following functions and features:
Protection of overload and over-current
Protection of phase-loss
Protection of overvoltage
Current limit function
Interlock protection of control power supply
Two sets of control power hot standby for redundancy
Power cell communicate with controller through optic fiber, complete electric isolation.
System running in closed-loop, can use the expected value of field controlled
parameter (such as pressure, flow, temperature etc.) set by the user to adjust the motor rotating speed automatically. For instance: constant pressure water supply
system can realize the control of water supply volume by pressure
Multiple communication methods with host computer, isolated RS-485 interface,
standard MODBUS-RTU communication protocol, PROFIBUS-DP (optional), industrial Ethernet communication protocol (optional)
Accurately fault records, can inquiry information and locate fault
Cabinet door opening alarm function
Compact construction, reasonable layout (can do customer-design)
The power supply input and output of Axpert-Hivert General Medium Voltage Drive meets the most stringent IEEE 519-2014 and GB/T14549-1993, no need of independent input filter, the cost for harmonic elimination is saved for customers.
Because of the high power factor of the system, the compensation device for power factor is not needed, thus the reactive input and the input capacity are reduced, and the cost for capacity increasing of power network is minimized.
High Quality Power Input
Using an isolated transformer, the input of Axpert-Hivert General Medium Voltage Drive could be isolated to grid. By phase shifting of the secondary winding and multi-pulse diode rectifier, isolated powers can be acquired and supplied for power cells (18 pulse for 3.3kV, 30/36 pulse for 6.6kV, 54 pulse for 11kV series). By using the technique of multi-pulse rectifier, the harmonic current could be eliminated greatly.
Fig. 1 Comparison of Harmonic
In Fig. 1, the harmonic distortion of 6-pulse VFD total current is 25 %, and the harmonic distortion of voltage is 10 %; the total harmonic distortion of 12-pulse VFD input current is 5.9 %, and the harmonic distortion of voltage is 3.3 %; for the Axpert-Hivert General Medium Voltage Drive, the harmonic distortion of 30-pulse total current in the case of typical power impedance is 1.00 % only; the corresponding voltage distortion is 1.00 % only.
Features of Nearly Perfect Power Output
The technique of power cell series connecting (namely multiple power cell structure) applied in Axpert-Hivert Medium Voltage Drive greatly eliminates the output harmonic content; the output waveform is almost a perfect sine waveform (see Figure 2 and 3). Compared with other high voltage and high power VFDs, it has the following advantages:
No need of extra output filtering device
Directly driving the general high voltage synchronous or asynchronous motor, and the temperature of the motor will not be increased
No need of motor derating operation
If you are looking for Synchronous drive then Amtech electronics provides synchronous drive.
No dv/dt damage to insulation of motor and cable
No torque ripple induced by harmonics, and the service life of motors and mechanism devices can be extended
No cable length limited when voltage drop is in the allowable range
Applicable standards and norms
Electric and electronic products -- Basic environmental test regulations for electricians -- Guidelines for vibration (sine)
Colors of insulated conductors used in electrical assembly devices
Specification for single and double sided printed boards with plain holes
Sectional specification: Single and double sided printed boards with plated-through holes
Semiconductor self-commutated converters
Basic test method for electric-driving control gear assemblies
General specification for speed control assembly with semiconductor adjustable frequency for AC motor
General technical standard for electrical equipment structure
Power semiconductor converters -- Electrical test methods
Quality of electric energy supply harmonics in public supply network
Practices and requirements for harmonic control in electrical power systems
Adjustable speed electrical power drive systems, Part-4: General requirements. Rating specifications for AC power drive systems above 1000 VAC and not exceeding 35 kV
Electric-driving control gear, Part-2: Electric-driving control gear incorporating electronic devices
Electro-technical terminology -- Low voltage apparatus (equivalent IEC 60050-441:1984)
Semiconductor converters. Specification of basic requirements (equivalent IEC 60146-1-1:1991)
Semiconductor converters. Transformers and reactors (equivalent IEC 60146-1-3:1991)
Degrees of protection provided by enclosures (IP Code) (equivalent IEC 60529:1989)
Insulation coordination for equipment within low-voltage systems - Part-1: Principles, requirements and tests (equivalent IEC 60664-1:1992)
IEC Standard voltages
International electro-technical vocabulary, 151: electrical and magnetic devices.
International Electro-technical Vocabulary, 551: Power electronics.
Electric power transformer
Classification of environmental conditions, Part-3: Classification of groups of environmental parameters and their severities, storage.
Classification of environmental conditions, Part-3: Classification of groups of environmental parameters and their severities.
Classification of environmental conditions, Part-3: Classification of groups of environmental parameters and their severities. Stationary use at weather protected locations.
Electromagnetic compatibility (EMC) Part-2: Environment Compatibility levels in industrial equipments for low-frequency conducted disturbances.
Electromagnetic compatibility (EMC) Part-4: Testing and measurement techniques chapter 7. General guide on harmonics and inter-harmonics measurements and instrumentation, for power supply systems and equipment connected thereto.
Adjustable speed electrical power dive systems, Part-3: product standard including specific test methods.
Identification of insulated and bare conductors by colors.
Environment condition guides for specifying performance rating of equipment.
Power station fan and water pump Medium Voltage Drive.