Build an Incremental Encoder Quick Tester

May 6, 2014

How to Build a Portable Incremental Encoder Tester Every once in while, it’s nice to have a handheld device that can be used to see quickly if encoder signals are present. I designed and built a quick-tester that allows for fast interface to an encoder without having to drag out...

Using an Optical Encoder to Show RPM on a PLC

April 27, 2014

. I have interfaced a 200 line count QR145 optical encoder to a DL06 PLC. The PLC’s inputs are set up in high speed mode to receive the incremental quadrature pulses coming from the optical encoder. . CT174, the designated high speed up/down counter is used to interface to the...

Using an Optical Encoder to Measure Angles

April 23, 2014

I have interfaced a 200 LC QR145 to a DL06 PLC to show how to convert from a line count to mechanical degrees. This type of conversion may be useful for any application of optical encoder to measure angles. To calculate a degree measurement we divide 360 by the line...

Optical Encoder Pulse Counting with a PLC

April 19, 2014

I have interfaced a QR145 200 Line Count Optical Encoder to a DL06 PLC and set up the PLC for mode 20 ‘High speed Up/Down counter’. Here is a video of Optical Encoder Counting: Below is the ladder logic code for programming the PLC to count pulses from the QR145...

Ladder Logic to Decode Direction from an Optical Encoder

April 15, 2014

I set up a QR145 optical encoder on a Direct Logic DL06 PLC with some simple Ladder Logic to determine direction based on the A and B incremental inputs. Below is a video of the optical encoder in action: In the PLC I used (DL06), the inputs are filtered, which...

How to Time Optical Encoder Commutation Channels to a BLDC Motor

March 17, 2014

Optical Encoder Brushless DC Motor Timing Using Back EMF The optical encoders we work with have a set of three Commutation tracks (U,V,W) which correspond to the three phases of the motor (R,S,T). Alignment of the optical encoder commutation signals to a BLDC motor could be thought of as being...

Optical Quadrature Encoders

February 22, 2014

An optical quadrature encoder is an incremental encoder with outputs consisting of two incremental channels that are out of phase by 90 electrical degrees. In each part of the encoder cycle, the two signals are in unique positions relative to each other. By comparing the difference between the high and...

Understanding Options on the QDH20 Industrial Rotary Encoder

November 20, 2013

The QDH20 Industrial Rotary Encoder is an IP66 sealed encoder made for the rugged duty of an industrial application. Due to the huge array of configuration options, this optical encoder has over 200,000 possible ways that it can be configured. While this is certainly an advantage to an end user...

Interlaced Sensor Technology in Rotary Incremental Encoders

May 13, 2013

The shadow technology sensing scheme patented by Quantum Devices Incorporated also corrects for disk centering problems such as disk eccentricity and disk wobble, where the movement and alignment of the disk varies in three dimensions, and normally creates variations in signal amplitude and ultimately output signal.

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