Feature Sensors & Sensing Systems Encoder setting is easier than ever
When setting up programmable angle encoders, system integrators, production plants and service personnel face a variety of difficult challenges. Here, Variohm EuroSensor offer some set-up tips
and adjustment. A key factor here is that installation in a machine is not restricted by mechanical tolerances or the angle position of the rotary encoder. This can be illustrated with the set- ting of the start and end points in a ‘plough turn control’ application. Once the angle sensor has been attached in any position, the plough is physically moved to its starting point and Set 1 is set to zero. In the next step, the plough is moved to its end position and the second input (Set 2) is connected to ground. This process sets the start and end points and ensures highly accurate adjustment of the encoder.
Customer benefit ●
recision installation and adjust- ment of encoders, exact setting of the zero or middle point or the start and end points, are just some of the hurdles facing systems integrators, production plants and ser- vice personnel.
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Components are frequently installed in such confined spaces that mechani- cal adjustment of the rotary encoder is impossible or extremely difficult. There is also frequently the need to reset angle sensors in the field in order to adjust for wear related changes of the measured system. This should be easy and convenient to do and not require any complex aids.
A further issue that should not be underestimated is the wide variety of available applications that many cus- tomers have, and the numerous requirements these place on the encoders. Whilst it is true that high precision angle sensors are preconfig- ured with custom output characteris- tics and angle ranges, and are available
at attractive prices ex-works, the pro- curement and storage of a range of dif- ferent encoder variants has logistic and financial consequences.
A solution is on hand To meet these challenges and create a high level of flexibility for customers, Contelec (for whom Variohm EuroSensor is the exclusive UK distribu- tor) has developed a solution with its ‘setting features’. These enable the on- site configuration of encoders based on Vert-X MH-C2 technology after installa- tion. To enable parameterisation, the rotary encoders have two additional dig- ital inputs (Set 1 and Set 2), which are used to set the sense of rotation (CW, CCW), index points (zero point or middle point) or start and end points as often as is needed. All this process needs is to connect the two input leads to ground in a specific sequence. The configuration of the Vert-X MH- C2-based angle sensors with integral setting features simplifies installation
Above: efficient ploughing with optimal plough inclination can now be easily achieved
Easy, individual setting of the sense of rotation (CW, CCW), index points (zero or middle point) or start and end points - on-site and without any addi-
No mechanical adjustment of the rotary encoder necessary (time and cost saving, highly accurate angle mea- surements even in systems which do
tional aids. ●
not permit mechanical adjustment). ●
Compensation of mechanical inaccu- racies on the system being measured
tion tolerances. ●
(component tolerances are eliminated). ●
(increase in quality). ●
High level of safety ensured by stan- dardised setting sequence and non-
reduced costs). ●
volatile storage of the settings. ●
Also suitable for use in heavy duty solutions.
Performance characteristics The Contelec Vert-X MH-C2 rotary encoders with integral setting features significantly simplify installation and adjustment of angle sensors. Example (left): setting the angle range (start and end points) and sense of rotation. 1. Turn the rotary encoder to the desired starting angle.
2. Connect ‘Set 1’ input to GND. 3. Within the specified time, turn the rotary encoder to the desired end angle and connect the ‘Set 2’ input to GND. 4. The angle range and sense of rotation (CW) have now been set and stored.
Variohm EuroSensor
www.variohm.com T: 01327 351 004
22
Easy compensation of mechanical wear by ‘readjustment‘ in the field
Reduction of the required number of encoder variants (simplified storage,
Maximisation of measurement accuracy - even with wide installa-
Enter 206 APRIL 2013 Automation
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