5v supplied from Masso Gecko 203v disable pin

R

radiola

Radiola
Hi team,

Does anyone know whether the USB on a masso G3 is 'alive' all the time? I need 5v supply for a signal to my Gecko G203v 'disable' pins and i don't want to install a separate supply for this tiny job. I have thought of using a dropper resistor (nope), a Zener diode arrangement (bit crude) and a buck converter (adequate) which are all at my disposal however the 5v available from one of the USB ports on the masso appeals to me more (K.I.S.S). The current draw will be negligible as it's just a logic '1" i need which will be supplied to the drives via a contact on a safety relay. I'm not up to a stage where i want to power the Masso as my panel is still on the bench and a bit chaotic.
 
M

MartinTX

New member
radiola said:
Hi team,

Does anyone know whether the USB on a masso G3 is 'alive' all the time? I need 5v supply for a signal to my Gecko G203v 'disable' pins and i don't want to install a separate supply for this tiny job. I have thought of using a dropper resistor (nope), a Zener diode arrangement (bit crude) and a buck converter (adequate) which are all at my disposal however the 5v available from one of the USB ports on the masso appeals to me more (K.I.S.S). The current draw will be negligible as it's just a logic '1" i need which will be supplied to the drives via a contact on a safety relay. I'm not up to a stage where i want to power the Masso as my panel is still on the bench and a bit chaotic.
Click to expand...
Greetings from Texas. Out of curiosity did this work for you? Not having luck with movement on the 203vs.
 
zombieengineer

zombieengineer

ZombieEngineer
The G203V has optoisolated inputs:
The STEP, DIRECTION and DISABLE inputs are optoisolated. All three inputs work with 2.5V, 3.3V or 5V logic drive signals. The input drive current is now 2.5mA at 2.5V so almost all logic family (74LS, 74HC, etc.) can be used to drive these inputs. The COMMON return for the signals is controller ground referenced instead of +5VDC. This greatly eases the drive to controller interface.
Click to expand...
To use a 24V signal for the DISABLE would require resistor in series. Assume the input requires 5mA @ 5V then the required resistor would be (24V - 5V) / 0.005 Amps = 3800Ω. Repeating the calculation using 2.5mA @ 2.5V gives (24V - 2.5V) / 0.0025 Amps = 8600Ω.

Therefore any resistor between those two values should work fine for a 24V system (3.9KΩ, 4.7KΩ, 5.6KΩ, 6.8KΩ and 8.2KΩ).
 
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