Wiring PNP NC sensors

[jan]

All,

I'm at a loss on how to wire these sensors. I've reviewed some of the other posts here, but I do not have a multimeter and cannot test the sensors so cannot follow this guide here. https://docs.masso.com.au/index.php/quick-start-guides/homing-sensor-identify

I have these sensors:

Heschen M12 Inductive Proximity Sensor Switch Non-shield Type LJ12A3-4-Z/AY Detector 4mm 10-30VDC 200mA PNP Normally Closed (NC) 3 wire : Amazon.co.uk: Business, Industry & Science

Heschen M12 Inductive Proximity Sensor Switch Non-shield Type LJ12A3-4-Z/AY Detector 4mm 10-30VDC 200mA PNP Normally Closed (NC) 3 wire : Amazon.co.uk: Business, Industry & Science

www.amazon.co.uk

https://www.heschen.com/product-page/heschen-inductive-proximity-sensor-switch-lj12a3-4-z-ay-detector-4-mm-6-36-vdc-3

It has 3 wires and the diagram on the sensor looks like this:

 

[zombieengineer]

Do you have one or two proximity sensors for the same axis?

The following assumes only one proximity sensor per axis:

• Connect 1BN to positive (+) of Masso power supply
  
• Connect 4BK to an input of the Masso controller
  
• Connect 3BU to negative (-) of Masso power supply
  

Go to the F1 screen and review input status (for limit switch - High when limit is reached).

If the input status is incorrect, select the input and press <SPACE> to invert the input status.

Test the input by placing a piece of steel at the face of the proximity sensor, the F1 screen will automatically update based on the current inputs. Make sure that the input is correctly changing state before attempting to configure the homing sequence.

 

[santina72]

Thank you for these recommendations.

 

[jan]

@zombieengineer. thanks for the help!

It now works (and I can home the machine) although the red led indicator of the light is permanently on and turns off when the sensor is triggered. The input shows HIGH as default and I invert it to show low. Is this the correct set-up?



Also, I am wiring a 4 closed-loop stepper motors (Leadshine type) and have to wire the alarms. Looking at the connection diagram, I can see I need to wire the alarms to the input terminal as well as to "+ve of Masso Power Supply" but it seems there are only 6 of these terminations and 4 are already taken up by the sensors, leaving only 2 remaining for the 4 motor alarm connections. Should I connect more than one alarm (or one sensor) per +ve termination?



Thanks in advance

 

[zombieengineer]

Proximity sensors - According to Omron a NC sensor is active when it is not sensing an object. Therefore the what you are seeing is correct. This has some benefits that if the wire to Masso is broken it will stop the machine immediately (fail safe).

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As for the Leadshine stepper driver - I am assuming that you have an "EM" series driver (DM does not support alarms, MX has a common alarm). Connect the ALM+ to the +24V power source (the power supply that supplies the Masso controller or the +ve termination on the controller) and connect the ALM- to one of the inputs of the Masso controller.

You can connect multiple sensors to a single +ve terminal on the Masso controller. If you are using the +ve terminals on the Masso controller it is extremely important to have a fuse in the power supply line to the Masso controller - quite a few Masso controllers have been burnt out when a wire from the +ve terminal shorts to ground (it burns out a PCB track on the Masso controller board).

 

[jan]

Thanks - I realised that the NC sensor was likely to operate correctly.

The drive is a Chinese version and similar to the CS-D1008. I've had a look at this page" https://docs.masso.com.au/wiring-an.../leadshine-cs-d1008#drive-alarm-signal-wiring but it seems to show the wiring in reverse with the ALM+ connected to any input on the Masso controller and the ALM- to the "+ve of Masso Power Supply".



Thanks for the note on the sensor wiring - I do have the 1A fuse installed. Just to check - can I also wire multiple sensors GND wires to the same terminal on the Masso controller? If yes, then I can combine two sensors per terminal.

Thanks

 

[breezy]

@jan

Jan,

Thanks for the update on the error on the alarm circuit. I put the correction in to our drafting section to update the documentation.

If you look at the Leadshine manual it shows a resistor from the ALM+ to a +ve supply and ALM- to GND.

So connect a 5.6k resistor to a MASSO + terminal and the other end with ALM+ to the input you are going to use and connect ALM- to a -ve terminal.

Regards,

Arie.