Quote Originally Posted by Doddy View Post
You bought a UC300eth for the controller?, the supply, and outputs from this are 5V and you do not require the use of resistors. Okay, you're connecting this to the 5-axis BoB - that will also require a 5V supply, and the motor outputs from that will be 5V level (the BoB may have a 12-24V input to supply the PWM 0-10V spindle speed controller (though I can't see any evidence of the circuitry for this on the image linked) - but will also require a 5V supply for the on board logic devices). Again - no need for resistors.

My words of caution on that BoB - there's no evidence of opto-isolated inputs on that BoB - which leads me to believe that all inputs (from switchgear, limits, e-stops etc) must also be referenced to a 5V supply.
Doddy thank you for your explanation.

Please verify if i understand you correctly and false or true the below.


1 -
Pulse, dir, enable, from uc to 5 axis bob is 5 volt level. based on 5volt supply circuit to bob/uc.


2-
External psu connection 12/24vdc to bob is for 0-10volt /pwm only.


3-
Estop / axis end switches.
I have 24vdc volt power supply which will be used to power the e-stop circuit / relais.

1 free contact on e-stop relais will connect to bob e-stop pin / bob gnd.


4-
Homing.

LJ8A3-2-Z/BX
These proximity switches are NPN.


Now because they run off a higher voltage separate psu i have to connect 5 volt ground to 24volt ground or they will not work icm with 5axis bob inputs.


This worries me a little since i thought the bob would be 24v on the inputs for homing
based on the applied external psu.

I have read on this forum 24v signals are preferred for interference reasons.

5-
I read your warning about the opto isolation, this worries me to.


Having a € 175,- motion controller i.c.m. with a € 5,- bob that does not protect the controller... does not make sense.

Please comment on the above.


Grtz. Bert.











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