Technical guide Protection criteria for medium voltage
... The “from the theoretical point of view” statement, is to underline that, from the theoretical point of view, it is possible to identify and therefore eliminate just the trunk fault from service. From the practical point of view, in many plants this is not possible since the times needed to eliminat ...
... The “from the theoretical point of view” statement, is to underline that, from the theoretical point of view, it is possible to identify and therefore eliminate just the trunk fault from service. From the practical point of view, in many plants this is not possible since the times needed to eliminat ...
Adapting KMS for Custom Hardware
... The ideal maximum phase current needs to be selected more carefully than the maximum DC bus. This is due to its importance when controlling the motor. The maximum phase current needs to be the smallest possible value that is still larger than the expected maximum value the system will see. This will ...
... The ideal maximum phase current needs to be selected more carefully than the maximum DC bus. This is due to its importance when controlling the motor. The maximum phase current needs to be the smallest possible value that is still larger than the expected maximum value the system will see. This will ...
DC Machines
... turn in the armature, is unidirectional no doubt but the magnitude of the voltage is not constant with time. Therefore, to improve the quality of the voltage similar to the nature of a battery voltage, a single coil in the armature with two commutator segments will not do. In fact, a practical d.c m ...
... turn in the armature, is unidirectional no doubt but the magnitude of the voltage is not constant with time. Therefore, to improve the quality of the voltage similar to the nature of a battery voltage, a single coil in the armature with two commutator segments will not do. In fact, a practical d.c m ...
Relay Selection Guide
... Traditionally, the characteristics of time overcurrent relays has been published in the form of graphical curves showing the dependent variable (operating time) on the vertical axis and the independent variable (operating current) on the horizontal axis. It is also a tradition that these curves are ...
... Traditionally, the characteristics of time overcurrent relays has been published in the form of graphical curves showing the dependent variable (operating time) on the vertical axis and the independent variable (operating current) on the horizontal axis. It is also a tradition that these curves are ...
R-series - Dynamic Controls
... performed using a controlled programming tool available only to authorised personnel. The product is not user serviceable. Specialised tools are necessary for the repair of any component. Do not install, maintain or operate this equipment without reading, understanding and following this manual – in ...
... performed using a controlled programming tool available only to authorised personnel. The product is not user serviceable. Specialised tools are necessary for the repair of any component. Do not install, maintain or operate this equipment without reading, understanding and following this manual – in ...
VACON NXS NXP User Manual
... The User Manual gives you the necessary information about the installation, commissioning and operation of Vacon NX AC drives. We recommend that you read carefully these instructions before the first power-up of the AC drive. ...
... The User Manual gives you the necessary information about the installation, commissioning and operation of Vacon NX AC drives. We recommend that you read carefully these instructions before the first power-up of the AC drive. ...
FR-F800 Installation Guidelines
... make an emergency stop (power off, mechanical brake operation for emergency stop, etc). Make sure that the start signal is off before resetting the inverter alarm. A failure to do so may restart the motor suddenly. Do not use a PM motor for an application where the PM motor is driven by its load ...
... make an emergency stop (power off, mechanical brake operation for emergency stop, etc). Make sure that the start signal is off before resetting the inverter alarm. A failure to do so may restart the motor suddenly. Do not use a PM motor for an application where the PM motor is driven by its load ...
16 Transformer and Transformer-feeder Protection
... e. system fault level The very high flux densities quoted above are so far beyond the normal working range that the incremental relative permeability of the core approximates to unity and the inductance of the winding falls to a value near that of the 'air-cored' inductance. The current wave, starti ...
... e. system fault level The very high flux densities quoted above are so far beyond the normal working range that the incremental relative permeability of the core approximates to unity and the inductance of the winding falls to a value near that of the 'air-cored' inductance. The current wave, starti ...
section 15185 - hydronic pumps
... b) Shop drawing indicating dimensions, required clearances and location and size of each field connection. c) Power and control wiring diagrams d) System profile analysis including variable speed pump curves and system curve. The analysis shall also include job specific load profile and staging poin ...
... b) Shop drawing indicating dimensions, required clearances and location and size of each field connection. c) Power and control wiring diagrams d) System profile analysis including variable speed pump curves and system curve. The analysis shall also include job specific load profile and staging poin ...
197 RM1 XA LT3 S LR97D LT47 LUTM p0BL LTM R
... In addition to the protection provided by TeSys d thermal overload relays (see page 24516/2), they offer the following special features: b protection against phase imbalance, b choice of starting class, b protection of unbalanced circuits, b protection of single-phase circuits, b alarm function to a ...
... In addition to the protection provided by TeSys d thermal overload relays (see page 24516/2), they offer the following special features: b protection against phase imbalance, b choice of starting class, b protection of unbalanced circuits, b protection of single-phase circuits, b alarm function to a ...
user`s manual - MEI`s Technical Support
... • Conduct trial operation on the servomotor alone with the motor shaft disconnected from machine to avoid any unexpected accidents. Failure to observe this caution may result in injury. • Before starting operation with a machine connected, change the settings to match the parameters of the machine. ...
... • Conduct trial operation on the servomotor alone with the motor shaft disconnected from machine to avoid any unexpected accidents. Failure to observe this caution may result in injury. • Before starting operation with a machine connected, change the settings to match the parameters of the machine. ...
Teknologi Elektrik - ENCON
... The voltage ratio of induced voltages on the secondary to primary windings is equal to the turn ratio of the winding turn number of the secondary winding to the winding turn number of the primary winding. Therefore the transformers can be used to step up or step down voltage levels by choosing appro ...
... The voltage ratio of induced voltages on the secondary to primary windings is equal to the turn ratio of the winding turn number of the secondary winding to the winding turn number of the primary winding. Therefore the transformers can be used to step up or step down voltage levels by choosing appro ...
VLT HVAC Drive Variable Frequency Drive Guide Specification
... throughout the entire load range are not acceptable. VFDs with saturating (non-linear) DC link reactors shall require an additional 3% AC line reactor to provide acceptable harmonic performance at full load, where harmonic performance is most critical. D. The VFD’s full load output current rating sh ...
... throughout the entire load range are not acceptable. VFDs with saturating (non-linear) DC link reactors shall require an additional 3% AC line reactor to provide acceptable harmonic performance at full load, where harmonic performance is most critical. D. The VFD’s full load output current rating sh ...
Induction motor
An induction or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.Three-phase squirrel-cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.