Encoders at LMS

This Application Note describes which Encoders can be used together with different LMS and also how the encoders can be used together with the sensor.

 

Types to use

We recommend to use the encoder with the following properties together with LMS1xx/5xx:

•  two-channel rotary encoder with 90° phase Offset
•  supply voltage: 24 V DC
•  outputs: push/pull (HTL) Outputs
•  enclosure rating IP 54 or better
•  screened cable (max.10m)
•  min. number of pulses: 50 pulses per cm
•  max. pulse frequency: 100 kHz

These are types like this ones:
DFS60, DBS60, DBS36, DBS50
Old and no more available versions:
DGS60, DGS65, DGS60-G, DGS65-G or DGS66-G

If you use any other types, please take care that they have HTL otuputs, working with 24V.
Resolution is recomended with min. 50 inc/cm.

 

Connection table of the mentioned encoder types:

 

These 7 encoders were created a few years ago (incl. mounting bracket) especially for LMS400 and VMD.
In the past we mainly recommended the DFV60B-22EZ0-S03 (1051292) which is contained in the last mounting set below (2058477)
As can be seen in the pictures, the first five do have a knurling, the last two an o-ring an their wheel.

2058477: electrical connection with M12 cable that is included in the set with 10m length and 4 Pin ; resolution is 0,2 mm, number of lines / pulses per revolution = 1500 pulses per revolution, maximum operation speed is 3,000 revolutions per minute ( --> up to 75 kHz)
2039457: electrical connection with M12 cable included in set with 10m and 4 Pin connected (see below), resolution is 0.2 mm which amounts to 1,000 pulses per revolution , max. operating speed is 1,500 revolutions per minute. (--> up to 25 kHz)

2024126: electrical connection with preassembled cable, but difficult to get detailed information, my guess is resolution = 1,0 mm, which amounts to 200 pulses per revolution, at max. 1,200 revolutions per minute. (--> up to 4 kHz)

 

Please note however that the max. Input frequency of the LMS400 is 10 kHz
Max. belt speed with the first two encoders is therefore 2 m/s with the third it is theoretically 10 m/s, but resolution is 5 times lower.

 

the pulscounter of the encoder is a value in the LMS that counts up with every tick of the encoder. It cannot be resetted by the LMS itself, it always counts.

 

The LMS cannot be triggered via an encoder signal.
In the parametrisation of the device you can see the possibilities you have to trigger the LMS:

Encoder is not a possibility as it is connected to Input 2 and 4.