Monday, February 09, 2015

Electrical Control Panel Wiring

Just like rackmounts hold big instruments or computers, control panels small or big have to hold DIN Instruments, switches and annunciators to make it easy for the operator. The maintenance work also is simple from the backside. It can be kept near the machinery which it controls.

Some Control panels go into Control Rooms at a distance away or at a greater height from the shop floor. This way they can monitor and give instructions while managing a larger process like processing of chemicals and at the same time safeguarding the instrumentation and computers with controlled environments.

Electrical Control Panel Wiring

Some of the pdf circuits are not easy to read, some have errors, this is mainly due to the importing of schematics from an older ORCAD Dos Version. I have corrected some circuits, some are to be checked. Also some circuits were not corrected after they were drawn by New Learners, as i wanted them to document what they learnt and familiarize with computers, Some did a good job. This section has no electronic parts, so you can figure out the diagrams.

Some example circuits of panels here Electrical Control Panel Wiring

delabs Technologies

Sunday, February 08, 2015

Process Control Instrumentation

This is a generic or standard controller for any type of process. Shown here is a temperature controller.

The STC1000 could be used for Ovens or furnaces, liquid baths, heating or environment chambers. It has a single analog input and an analog or relay output.
Temperature Controller

Process Control Instrumentation Section Updated

Analog inputs could be like 4-20 mA, thermocouple or RTD. Analog outputs can be 0-10 V for a thyristor drive, SSR drive output or potential free contacts of a relay to operate external 3 phase contacters.

The closed loop control could be On-Off or Time-Proportional. It was known as digital temperature indicating controller. Sometimes it would be used just as a Alarm or in a Trip circuit for protecting a system, when a uP or uC based PID controller fails.

This is used in the processing of plastics, rubber, metals and in chemical plants too. Here is a checklist that was made for helping its fabrication. You can see the limitations in which we manufactured these products. An optimum quality was evolved, defined by a user's affordability of the product.

Friday, February 06, 2015

Learn Electronics with EveryCircuit

An Android App on which you can create a circuit, tap play and watch dynamic voltage, current, and charge animations.

Learn Electronics with EveryCircuit

Even when the live simulation is running you can tweak circuit parameters with an analog knob, and the circuit reacts in real time for your study and experimentation. Ohm's law, Kirchhoff's current and voltage laws, nonlinear semiconductor device equations, and more.

Learn Electronics with EveryCircuit

EveryCircuit Free

"Simplicity, innovation, and power, combined with mobility, make EveryCircuit a must-have companion for high school science and physics students, electrical engineering college students, breadboard and printed circuit board (PCB) enthusiasts, and ham radio hobbyists."

This app is related to Paul Falstad EE Applets and Tablet Apps

These are some educational java applets I wrote to help visualize various concepts in math, physics, and engineering. - Paul Falstad

Thursday, February 05, 2015

Process Control Circuits for Automation

These are the circuits and boards of a Mini Temperature Transmitter for a Platinum hundred ohms temperature Sensor.

Industrial Process Control Circuits has been updated.

3 Wire Transmitter

Circuits in process control
The customer wanted a two wire system, this needs low power opamps which were ten times the price. If this transmitter works at 3mA it could have been two wire. Those parts were in short supply and the budget of customer was low. So i made it with regular opamps but three wire. The customer was satisfied as he got a cost effective solution. But now the situation of markets and products are different.

If you need to transmit the temperature from a high voltage area or toxic environment. You will need to hermetically seal the transmitters, convert the Voltage to frequency, frequency to IR LED flashes or RF. This can be then remotely monitored. Then the transmitter has to be battery-solar operated, low power too. ICL7135 is a simple solution. It has a serial output that can be used to Drive IR Leds. Remotely sense these flashes in a Micro-controller and you have a reading. You may be able to use optic-fibers too. Where volatile liquids are present so that the risks of sparks can be eliminated.

Open Source Android Oscilloscope

An android virtual instrument - OsciPrime is an Open Source Android high speed data acquisition hardware platform and Android oscilloscope application.

Open Source Android Oscilloscope

OsciPrime data acquisition

Using USB, the hardware plugs into Android devices that support USB Host. Together with the OsciPrime Android oscilloscope application it turns a tablet or mobile phone into a high speed data acquisition system.

Open Source Android Oscilloscope

Hardware Specs:
  • 2x Analogue Input @ 8bit/6Msps
  • 5 analogue gain levels
  • 3.3 MHz - 8.0 MHz Bandwidth (gain dependant)
  • 16 V Max Input Voltage
  • 880 mW Power Consumption
  • Designed for 10x Probes
The Android App Instrument Performance and Controls Include

Controls -V-Offset, Time-Offset, Calibration; Trigger Controls Falling/Rising and Edge, You can Measure Voltage, Freq and Period.  
  • Range +/- 1.5 V up to +/- 16 V
  • 5 us/Div max - 1 ms/Div min 
  • Processing 400'000 samples per second

Tuesday, February 03, 2015

Jot-a-Note changed added Widgets

The Gadget Jot-a-Note which was on Google Gears has been modified for Cookies Data Storage. Now it has Sticky Notes, Clock and Calculator. Online Desktop. Just break Frames and do a Full Screen on chrome.

Jot-a-Note for your iGoogle or Blog

Jot-A-Note also supports HTML inside notes. That means you can have Simple HTML and CSS formatting. Images and iframe-gadgets. Jot a Note is now Jot Desktop .

Jot-a-Note changed added Widgets

There is a Golden SteamPunk Clock too built in. If you want it separately in your iGoogle..