This manual is applicable to all integral horsepower DC motor controls of this series from 40 HPto 300 HP. The integrated circuit regulator selection of these DC motor controls are modular inconstruction, affording a minimum of down time in the event of a malfunction. Exceptional speedregulation and torque limiting is realized over their full oper
Click here to download the full size of the above Circuit.
ating range. Operational features include: minimum and maximum speed adjustments, acceleration anddeceleration, current limit and IR compensation adjustments. In addition, forcing andstabilization adjustments are provided for stabilizing the drive in systems with various intertialsand the constants. Fault logic circuitry protects the controller from over current, phase loss, incorrect phase sequence and over temperature. The power section of the controller is a three phase full wave bridge (six thyristors). Thisconfiguration yields full-wave six-pulse control of the motor over the entire speed range. Thyristors, which are silicon controlled rectifiers, conduct when their gate terminal is pulsedpositively with respect to the cathode. Once switched on the thyristor remains conducting untilits anode voltage falls to zero. Pulsing the thyristor "on" late in the half cycle, when its anodeis positive, will cause a small amount of DC power to be delivered to the motor. Pulsing thethyristor early in the half cycle will result in a large amount of power being delivered to themotor. Thyristor switching waveforms are shown in section 3. 1. A printed circuit board assembly called the firing circuit provides the pulses to gate or turn onthethyristors. Three pulses spaced 60 0 apart switch the thyristor on at the adjustable point in each half cycle they appear. When low speed is called for the pulses appear late in the half cycle. When...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: