1 Introduction 2
... The inverted analogue output signal (4-20 mA) might be used to control a frequency inverter in a way that makes it possible to keep the power consumption of the machine at a constant level by changing the revolution speed. The same is achievable, within certain limits, with mechanical variable gears ...
... The inverted analogue output signal (4-20 mA) might be used to control a frequency inverter in a way that makes it possible to keep the power consumption of the machine at a constant level by changing the revolution speed. The same is achievable, within certain limits, with mechanical variable gears ...
sample questions - Department of Electrical Engineering, IIT
... 2. A single phase full bridge diode rectifier operates from a 220V, 50 Hz single phase supply and delivers power to a 50 Ω resistance connected across the output capacitor. The voltage across the output capacitor may be assumed to be ripple free. i) Find out the value of the filter inductor (with ne ...
... 2. A single phase full bridge diode rectifier operates from a 220V, 50 Hz single phase supply and delivers power to a 50 Ω resistance connected across the output capacitor. The voltage across the output capacitor may be assumed to be ripple free. i) Find out the value of the filter inductor (with ne ...
20 Bipolar Transistors and Amplifiers
... • Forward polarity is applied to the left diode. • Electrons from the left n-region are driven to the positive battery 1 terminal through the layer p. • However, as the p-layer is very thin, most of the electrons miss the holes and shoot through the second barrier, toward the positive terminal of th ...
... • Forward polarity is applied to the left diode. • Electrons from the left n-region are driven to the positive battery 1 terminal through the layer p. • However, as the p-layer is very thin, most of the electrons miss the holes and shoot through the second barrier, toward the positive terminal of th ...
Post Glover Dynamic Braking Resistors
... Ohms are specified by the drive manufacturer as the minimum required resistance and are often stated as a range. Post Glover uses a manufacturing tolerance of -0 to +5% to prevent an overcurrent condition on the drive. Watts are stated as either a maximum braking power or continuous braking power. I ...
... Ohms are specified by the drive manufacturer as the minimum required resistance and are often stated as a range. Post Glover uses a manufacturing tolerance of -0 to +5% to prevent an overcurrent condition on the drive. Watts are stated as either a maximum braking power or continuous braking power. I ...
RESISTORS FOR ENERGY METERING
... by contributing to series inductance, but also by reducing the Q factor of the input network, thereby minimising the effect of any resonances. Critically, it serves to limit the peak MOV current during a lightning strike transient, reducing the stress on the MOV by dissipating a share of the pulse e ...
... by contributing to series inductance, but also by reducing the Q factor of the input network, thereby minimising the effect of any resonances. Critically, it serves to limit the peak MOV current during a lightning strike transient, reducing the stress on the MOV by dissipating a share of the pulse e ...
Lecture 1 - UniMAP Portal
... Safety considerations – Even small levels of current through the human body can cause serious, dangerous side effects – Any current over 10 mA is considered dangerous – currents of 50 mA can cause severe shock – currents over 100 mA can be fatal – Treat electricity with respect – not fear ...
... Safety considerations – Even small levels of current through the human body can cause serious, dangerous side effects – Any current over 10 mA is considered dangerous – currents of 50 mA can cause severe shock – currents over 100 mA can be fatal – Treat electricity with respect – not fear ...
009irrigationwiringnoreviewquestions
... Transformers: - used to “step down” voltage, typically step down 115 V to ~24 V. Wire size must be large enough so that the remaining voltage is sufficient to operate the electric diaphragm valve For most electric diaphragm valves, the minimum operating voltage is 21 V (unless otherwise specified) “ ...
... Transformers: - used to “step down” voltage, typically step down 115 V to ~24 V. Wire size must be large enough so that the remaining voltage is sufficient to operate the electric diaphragm valve For most electric diaphragm valves, the minimum operating voltage is 21 V (unless otherwise specified) “ ...
Definition of the module stray inductance Ls
... Fig.1: Half-bridge circuit with current and voltage waveforms when switching IGBT1 Due to the changing current a voltage drop of Lσ * dioff/dt occurs across the stray inductance Lσ. It is overlayed to the DC link voltage VCC and seen as a voltage spike across the turningoff IGBT1. Permissible limits ...
... Fig.1: Half-bridge circuit with current and voltage waveforms when switching IGBT1 Due to the changing current a voltage drop of Lσ * dioff/dt occurs across the stray inductance Lσ. It is overlayed to the DC link voltage VCC and seen as a voltage spike across the turningoff IGBT1. Permissible limits ...
Variable Frequency Drives
... Starting Induction Motors The starting current is very high, between 3 to 8 times the full load current. Depending on the size of the motor, this can result in voltage sags in the power system. The full torque is applied instantly at starting and the mechanical shock can eventually damage the drive ...
... Starting Induction Motors The starting current is very high, between 3 to 8 times the full load current. Depending on the size of the motor, this can result in voltage sags in the power system. The full torque is applied instantly at starting and the mechanical shock can eventually damage the drive ...
Power Voltage Transformers
... Secondary windings terminals, along with provisions for earthing are located in the secondary terminal box. Cable glands or plates provide entry to the secondary terminal box and are designed in accordance with customers’ needs. Size, type and material of secondary terminals depend on the transforme ...
... Secondary windings terminals, along with provisions for earthing are located in the secondary terminal box. Cable glands or plates provide entry to the secondary terminal box and are designed in accordance with customers’ needs. Size, type and material of secondary terminals depend on the transforme ...
Stepper motor
A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed.Switched reluctance motors are very large stepping motors with a reduced pole count, and generally are closed-loop commutated.