VACON® NXP Common DC Bus
They ensure all energy within a system is effectively utilized and redistributed. Common DC bus components can be used in many different combinations. In a regenerative DC bus system, the active front-end unit generates power back to the mains network.
This is suitable for processes where braking is needed often and the braking power is relatively high. In a non-regenerative system, braking power is redistributed to other drives in the system and possible excess power can be dissipated as heat using an optional brake chopper and brake resistors.
This is ideal for small production lines where braking is needed less often. Cost and space savings as optimized module design reduces need for additional engineering and cabinet space.
Continuous web and roller table systems, winders and unwinders, cranes, hoists, gantry and trolley drives, centrifuges, winches, conveyors and excavators. To optimize crane performance, Danfoss offers flexible control strategies combined with energy efficiency, operating within stringent safety requirements.
Draw upon expertise from Danfoss to optimize energy storage solutions on board vessels, and shore power supplies for quieter and cleaner harbors. For more efficient operation and greater freedom in ship design, consider an electric-based main propulsion with engineering from Danfoss. Pumps perform a myriad of tasks throughout mining operations. By investing in performance optimization with Danfoss drives, you can achieve more efficient pumping, better equipment protection and lower operating costs in a lot of different areas.
For lower energy consumption, increased performance, smooth ramping, and high reliability, use variable speed control for winders and unwinders. Get a quote. Supply voltages and power range Inverter units 3 x V Features and benefits Reduced energy costs as regenerative front-end feeds excess braking energy back into the network. Investment costs are low as a result of reduced power cabling and installation time.
Easy installation of compact option boards. Manual English Multiple 01 Mar, 1. English Multiple 01 Jul, Man English Multiple 01 Apr, 0. Man English Multiple 01 Apr, 3. English Multiple 01 Nov, M English Multiple 01 May, 1.Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.
Sign In. Access provided by: anon Sign Out. DC bus splitting voltage feedforward injection method for virtually-grounded three-phase inverter Abstract: The virtually-grounded grid-connected voltage-source three-phase inverter has been proven to be more effective in alleviating the common-mode noise than the one without the virtual ground and in extending the utilization of DC bus voltage, as compared to the four-wire configuration.
However, similar to the four-wire configuration, such virtually-grounded configuration would have DC bus unbalance, which would cause modulation saturation and output current distortion. Typically, two splitting capacitor voltages are measured and compared to produce a common-mode DC bias voltage to the output voltage of the inverter and thereby eliminate such effect. To reduce the number of sensors, a DC voltage feedforward injection method, which utilizes the intra-cycle average value of the duty cycles of the gate signals, is proposed to mitigate possible modulation saturation and output current distortion under the unbalanced condition of DC splitting voltage.
A 3kW prototype has been built and evaluated to investigate the effectiveness of the proposed method. Article :. DOI: Need Help?Home Power inverters Solar inverters Frequency inverters Contact.
Inverter Troubleshooting Guide. Electric motors form the backbone of most industrial and manufacturing environments.
Frequency inverters are used to control the speed, torque, acceleration, deceleration, and direction of the motor. The use of inverter has become prevalent in wide range of industrial applications; from motion control applications to ventilation systems, waste water processing facilities to machining areas, and many others. Though frequency inverters offer lower operating costs and higher efficiency, they are not without their problems.
According to a recent survey in the United States, motor failures caused by frequency inverters result in hundreds of thousands of hours of unplanned downtime each year. A frequency inverter's Basic Operation Before looking at methods for troubleshooting frequency inverters, let's review what a frequency inverter is and how it works.
A frequency inverter is a power conversion device.How does an Electric Car work ? - Tesla Model S
It converts fixed frequency sinusoidal alternating current AC voltage input, to direct current DC voltage, and then to variable-frequency AC voltage, which ultimately controls the speed of induction motors.
As illustrated in following Figure, a frequency inverter consists of three elements: rectifier, DC bus, and inverter. The capacitor's function is to reduce the AC ripple and to store the power from the rectifier.
The final element of the frequency inverter is referred to as an inverter. The inverter contains transistors that deliver power to the motor. Today, most frequency inverters use insulated gate bipolar transistors IGBT. The resulting variable-frequency AC precisely controls the power delivered to the motor. Frequency inverter Measurement and Safety When electricians encounter a motor failure, typically their first reaction is to use a digital multimeter DMM to initiate the troubleshooting process.
However, in some cases, using a handheld oscilloscope is a quicker way to isolate the exact nature of the problem. It is important to note that not all the oscilloscopes on the market are suitable for electronic power applications such as troubleshooting a frequency inverter.
Most oscilloscopes are earth grounded and voltage measurements are referenced to earth ground potential. This attribute can make safely acquiring accurate frequency inverter measurements challenging. Obtaining floating measurements with a ground-referenced oscilloscope can create a short circuit in the electrical power system and potentially damage the circuit and oscilloscope.
When floating the scope without a chassis ground, the mains voltage may appear on the metal chassis of your scope and the measurement will cause inaccurate readings.
This is extremely hazardous, since you may accidentally come in contact with it. Using a differential probe may seem to be a safer means of obtaining floating measurements with a grounded oscilloscope.It was easy to regulate the motor by simply varying the input voltage and polarity. In elevator and similar applications this worked well.
In contrast, it is much tougher to regulate the speed and direction of ac motors.
Difference Between UPS & Inverter
Thus for a long time, it was impractical to operate ac induction motors at anything other than a constant speed.
A successful strategy for controlling the speed of ac motors did finally emerge, and today it prevails. This ac power signal runs the motor, which is usually a three-phase induction motor in industrial settings.
The three-phase rectifier often consists of six diodes, two for each line phase, the two-wire output of which is filtered by two in-line series inductors and two capacitors connected together in series with the pair in parallel across the output.
The midpoint between the two capacitors is grounded, a fact that determines how an oscilloscope is to be connected to view the dc voltage, as we shall see. The inverter, a dc-to-ac converter, receives this pure dc. In examining a VFD, the first step is usually to verify the power input all three legs must be present with no appreciable difference in voltage or current.
To avoid this hazardous situation, there are two possible strategies. It is not line powered and is isolated from ground, so there can be no fault current when connecting either of the probe leads to a wire or terminal that is not at ground potential. The differential probe set amplifies or attenuates the difference between two signals. It then presents that electrical energy to the oscilloscope through one of the analog input channels.
This isolates the oscilloscope ground plain from any voltage level that could cause a large fault current. Tektronix offers differential probes in two versions, low voltage and high voltage. The low-voltage differential probe set is not to be used where the potential between the test points or between either test point and ground exceeds specified limits.
Normally the dc bus voltage in a VFD is 1. In regards to using the 12v battery as an input power supply for the inverter of the vfd, you will run into some serious obstacles in making that happen. The primary issue being that the system is engineered to run at specific voltages and the DC bus itself will hav been designed to run at a voltage far greater than 12 VDC, msot likely being somwhere between VDC.
If you were able to make the right connections within the VFD you would need to know exactly what the operating voltage and tolerances are for the DC bus, and then conncect enough batteries is series and maybe parrallel depending on the capacity of said batteries, and then have a way to kep the batteries charged at the specified voltage.The VFD control circuit continuously monitor the magnitude and quality of DC bus voltage DC link voltage or reservoir voltage and triggers appropriate protective functions when the thresholds are crossed.
Some important protective functions derived from DC bus voltage are:. Oftentimes when a drive trips on under voltage or over voltage, it becomes necessary to measure the DC bus voltage. However, if it is desired to do data logging of the DC voltage or if it is suspected that the DC voltage sensing circuit is malfunctioning, then it may be required to measure DC bus voltage.
A malfunctioning DC voltage sensing circuitry can lead to nuisance under or over voltage trip. The magnitude at which under voltage and over voltage trip is triggered varies between manufacturers and it is best to contact the manufacturer about the actual voltage at which trip happens.
The table below summarizes the under voltage and over voltage trip settings for few VFD manufacturers. Here are the few considerations before attempting to measure DC bus Voltage:. This should be kept in mind while attempting to measure the DC voltage.
DC to AC Inverter
Here are the nominal values of DC bus voltage. The test equipment and accessories selected for the application must be rated above these DC voltages.
Capacitor Voltage: Before attempting to connect to the DC bus voltage, de energize the drive and wait for minutes to allow complete discharge of stored energy in the capacitors. Selecting Right Equipment:. Real time DC bus voltage can be measured using appropriately rated multimeter or a handheld battery powered oscilloscope.
Before using any kind of measurement device on the DC bus, the following should be noted. Refer drive schematic below. Many bench type oscilloscopes have the probe ground clip and the AC input ground connected.
This is done for safety reasons. This could damage or destroy the test equipment. Hence It is preferred that a handheld battery powered oscilloscope is used instead of a bench type oscilloscope. Handheld oscilloscopes have no reference to AC system ground and hence are not susceptible to ground current flow.
An example of handheld oscilloscope is Fluke or 43B series.They ensure all energy within a system is effectively utilized and redistributed. Common DC bus components can be used in many different combinations. In a regenerative DC bus system, the active front-end unit generates power back to the mains network. This is suitable for processes where braking is needed often and the braking power is relatively high.
VACON® NXP Common DC Bus
In a non-regenerative system, braking power is redistributed to other drives in the system and possible excess power can be dissipated as heat using an optional brake chopper and brake resistors. This is ideal for small production lines where braking is needed less often.
Cost and space savings as optimized module design reduces need for additional engineering and cabinet space. Continuous web and roller table systems, winders and unwinders, cranes, hoists, gantry and trolley drives, centrifuges, winches, conveyors and excavators. To optimize crane performance, Danfoss offers flexible control strategies combined with energy efficiency, operating within stringent safety requirements.
Draw upon expertise from Danfoss to optimize energy storage solutions using drives for power conversion both on board vessels, and in shore power supply for quieter and cleaner harbors. For more efficient operation and greater freedom in ship design, consider an electric-based main propulsion with engineering from Danfoss. For lower energy consumption, increased performance, smooth ramping, and high reliability, use variable speed control for winders and unwinders.
Troubleshooting Chatbot. Get a quote. Supply voltages and power range Inverter units 3 x V Features and benefits Reduced energy costs as regenerative front-end feeds excess braking energy back into the network.
Investment costs are low as a result of reduced power cabling and installation time. Easy installation of compact option boards. Manual English Multiple 01 Mar, 1. English Multiple 01 Nov, DualPort Eth. Firmware 07 Aug, RL 7. Firmware 30 Mar, RL 7. Block 16 Feb, RL 2. Related applications. Drives for industrial crane and hoist movement. Drives for marine power conversion and generation.
Drives for marine propulsion and thrusters. Drives for winding and unwinding in industry. Ask our chatbot for help with faults, warnings and alarms. Case studies. Controlling a t slew crane on Chinese offshore pipe-laying vessel. Massive grabber crane in control at Tata Steel IJmuiden.
Higher energy efficiency for Ro-Pax vessels.The UPS and inverter both provides the backup supply to the electrical system. One of the major difference between the UPS and inverter is that the switching of UPS from the main supply to the battery is very immediate whereas in inverter the switching from mains supply to battery takes times.
The UPS has a battery which supplies the power during the power outages. The inverter inverts the direct current to an alternating current. It takes the supply from the AC source and charges the battery.
During the power cut, the inverter receives the supply from the battery and provides the power supply to the electrical equipment. The inverter converts the unidirectional current into bidirectional. Stand Alone and Grid Tie Inverter. Connection Directly connected to the appliances. It is connected to the battery and appliances. Only for Domestic Use. The UPS allows the power to flow through the system so that the data can be saved before the primary supply is fully shut down.
It also protects the system from power surges. The UPS has a battery which comes in contact with the power supply of the devices when it senses the power loss from the main supply. Their circuit consists the inverter, battery and the controller. The line interruptive UPS is also known as the standby power system. The line interruptive UPS has variable voltage transformer which adds or subtracts the power coils of wire. In online double conversion UPS, the battery is always connected to the inverter due to which no additional power transfer switches require in the circuit.
The inverter is an electronic circuit that changes the DC to AC. It does not generate electric power; the power is supplied from the battery. The input voltage of the inverter is the constant DC power source, and their output may be square, sine or pulse sine wave depends on the circuit and design of the inverter.
The frequency of the output wave of the inverter remains same as that of the standard frequency, i. Their runtime depends on the power of the battery. If the number of devices using the inverter increases then their running time will decrease.