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Tuesday, May 21, 2019

Three Point Preset Counter

This is a prototype of a Preset Counter. It is built with ICM7217. The cabinet is ABS Plastic DIN 96-96. The Panel is Engraved on Acrylic.

I don't remember for which application it was used. It has three thumbwheel settings, when the proximity switch counts upto the set-value, the corresponding relay turns ON, with a State Indicating LED on front panel.

Three Point Preset Counter

These can be configured sequentially or to work synchronously, this depends on what customer wants. Both modes may give the same result. In sequential operation, Some of these counters-timers may need to wait for an external trigger or feedback from a limit switch or another process like pressure alarm. Then more Input options may have to be provided.

Basic Electronic Digital Circuits

Counters, timers, analog-process and its interconnectivity makes up the various process loops or chain-reactions in Machine control. The various types of sensors for measurement and feedback of analog and event parameters, monitor the mechanical system and communicate the data to the process instruments.

Resistors and How they Work

Resistors start from Wires to Wirewound Types. Carbon Film Resistors are most Common, Metal Film Resistors are more stable and accurate. We have now SMD types with lower power some are Laser Trimmed Types for accurate values. Resistors Arrays are used in Digital Circuits.

Types of Resistors - Color code and Other Resources

1/4 W Resistors have a Voltage rating of around 200-250V. Even when using a High value like 1 Meg use two in series when it is across Mains 230 V AC. 470K + 470K - you get around a Meg at 500V
Rating.

Resistors and How they Work

Resistor 1/4W Metal Film
A standard range of 1/4W Metal Film Resistors suitable for most applications. High stability and solid construction ensure a long and stable life. 1% tolerance for the full range from 1R to 10M.

Riedon Resistors - Wirewound, Thick & Thin Film, and also Foil resistive elements.current sense, high pulse, high surge, surface mount, power and precision wirewound resistors.

High Performance Resistor Networks from Caddock - precision resistors, high voltage resistors, current sense resistors, chip resistors, high frequency resistors, and load resistors.

Ohmite’s Audio Gold resistors have been carefully engineered with non-magnetic materials to eliminate the effects of these stray magnetic fields on circuit performance. Ohmite’s LVC Series low value chip resistors are ideal for today’s current sense applications requiring low profile, low cost solutions

Mains Transformers Types

Low Frequency Power Transformers are used to step down mains voltage of 230V or 110V to safer voltages like 12V and 6V. The core is made of laminations of a Conditioned Alloy of Iron. The windings are Enameled or Insulated Copper Wire. They provide both Isolation and Safety while Scaling the Voltage and Power.

Mains Voltage Power Transformers

Mains Transformers Types

Transformers Made by Hammond Manufacturing