Battery foils double layer detection with IMC12 or IMC08

                         



Our proposal:
The IMC12-04BPPVC0SC05 #1084803 or IMC08-02BPPVC0SC05 #1084804.
The new IMC inductive double layer detection sensors are specially made for this task. 

Foils with a thickness of typically 100µm, but thinner 250µm can be detected.

This special version of the IMC is an easy way to detect double layer. You only have to mount it flat in the gripper, teach it via IO-Link master, SOPAS or via wire and that's it.
The distance to the first foil has to be always the same (otherwise no reliable differentiation between one or two foils is possible) therefore detection from the bottom that the distance to the lower foil is always the same or from top with eg. a plastic block where the IDF sensor is screwed in 1mm and the block lays directly on the upper foil, as you can see below:

Instead of the below showed IMC demonstrator you can use eg. a plastic part with threaded hole (M8 or 12) to screw the sensor in and have a fixed object - sensor distance which is very important to solve this application reliable.

 
one layer = good state: Q1 and yellow LED are active, blue LED is inactive

 
two layer = not good state: blue LED is active, Q1 and yellow LED are inactive

 
no layer = not good state: yellow LED and blue LED are active, Q1 is inactive

In the application the sensor switching output gets active in case of one detected foil which represents the "good" state of the gripper, that means the machine can run further after gripping.
In case of an inactive switching output after gripping which represents the "not good" state, with none or 2 foils, the machine stops/ lays down the 2 gripped foils/ has to grip new again.

The switching behaviour of Q1, the LED's and the IO-Link process data bits QL1 and QL2 looks like the table below:

Setup:
To show how to set-up the sensor we will show you via SOPAS.
Distance between sensor and Battery foil is 1mm +-0.2mm.
First of all open SOPAS and go to the tab "Teach", klick on "Start teach-in". Then follow the steps you can see.

First step, teach with no layer.

Second step, place two layers in front of the sensor and click on "Teach 2 layers".

Third step, place one layer in front of the sensor and click on "Teach 1 layer".
 

And the last step is "save" the teached data.
 

The thresholds will be set like you can see in the picture above (blue=SP2 and green=SP1).

To teach the IMC without IO-Link via the pin2 you have to
1. put the sensor on one foil and connect pin2 to 24V for 2s until the yellow sensor LED starts blinking. If the yellow LED blinks disconnect the 24V, 
2. put the sensor on two foils and connect pin2 to 24V for 2s until the blue sensor LED starts blinking. If the blue LED blinks disconnect the 24V
If the teach was successfully the yellow and blue LEDs light for 1s. Afterwards the yellow LED is active when 1 layer, the blue LED is act when 2 layers and both yellow and blue are active if no layer is detected.
If the teach failed the yellow and blue LEDs flash's for 2s with 7Hz.

The minimum difference between two foils must be at least 100 digits. 
In addition, there should be sufficient difference between 2 foils and no foil of 500 digits.

The sensor does not need to be reset. If the teach points do not match, you can simply teach again.

If necessary a reset via IO-Link standard command is possible: