Messages

1

General Mach Discussion / Re: AKZ250 BREAKOUT BOARD - NPN NO PROXIMITY SENSORS

« on: October 24, 2018, 12:43:39 PM »

Hi Roaster

Thank you. You are making me understand it better.

Late yesterday evening, I did a few more tests with various resistors and managed to drop the voltage down to 5,12V. So I now have a 24V power supply to all of the proximity sensors and with a single resistor between the BLACK signal wire and the terminal on the BOB.

Now that the proximity sensors, have a resistor connected to them, the voltage reads 5,12 V and as soon as I place a screwdriver in front of each sensor, the voltage drops to 0,78 V.

I assume that this is all okay?

Regards

Craig

2

General Mach Discussion / Re: AKZ250 BREAKOUT BOARD - NPN NO PROXIMITY SENSORS

« on: October 23, 2018, 12:17:58 PM »

Hello Roaster

Thank you very much for your response and explanation.

I tried a 3,3 K Ohm resistor on the one NPN type sensor, for the Z-Axis and the voltage dropped to 5,90V from the 24V power supply. So this voltage is too high.

I must admit that the resistors which I am using, are NOT referred to as "Pull-down" resistors. I enquired about this at the place where I bought them and the Assistant didn`t know what I was talking about.

Anyway, I will do some more testing to see if I can drop the voltage further. So far, the wiring is done and I just have to install a resistor between the BLACK wire and the input terminal on the BOB. I`m still confused, regarding the diagram shown on the AKZ250 manual.

Regards

Craig

3

General Mach Discussion / AKZ250 BREAKOUT BOARD - NPN NO PROXIMITY SENSORS

« on: October 22, 2018, 01:40:07 PM »

Hello Gents

I have built a cnc router from a kit and the X,Y and Z- Axis is working. Now I want to connect the NPN type Normally Open proximity sensors to the AKZ250 BOB.

The power supply is 24V DC and I am aware that a resistor must be installed, to reduce the voltage, between the sensor and the BOB.

The confusing part is, the way to wire the NPN proximity sensor, as per the AKZ250 User Manual.

This BOB is shown on YouTube and also how to wire the NPN sensor to it.

There are 3 wires on the sensor. BROWN, BLUE and BLACK.

BROWN = +
BLUE = - (GND)
BLACK = SIGNAL to BOB

The AKZ250 User Manual states that a RESISTOR must be installed between the BROWN+ and the BLUE (SIGNAL) and the BLACK wire goes to GND. The YouTube video shows a resistor connected between the BLACK wire (Signal) and the port on the BOB.

I don`t want to do something wrong here, which could cause the BOB to be damaged.

Any advice would be really appreciated.

Regards

Craig