On Fri, 27 Mar 2020, Leonardo Marsaglia wrote:
Date: Fri, 27 Mar 2020 20:35:43 -0300
From: Leonardo Marsaglia <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: [Emc-users] Question about 7i70 output voltage
Hello to all.
I have practically all my config ready so I'm just tweaking and testing
minor things.
One thing I've noticed is that the 7i71 has a I would say significant
lower voltage at the outputs compared to the field voltage I'm applying.
The outputs anyway are working as expected turning on the LEDs and going to
zero when I activate them.
The output voltage should be the same as the field voltage since the output
drivers are MOSFETs
Note that a 7I71 is a sourcing driver so the outputs drive a positive voltage
into a load that is referenced to power supply common
The voltage I measure at the outputs is 10.7 volts while VFIELD is around
12.1 volts. Do I have to worry about this? I suspect not because the
outputs are working as expected. But I just had to ask to be sure.
By the way I'm using the same PC power supply to drive all the boards now,
just for testing purposes so I'm not applying any load.
Thanks as always!
Leonardo Marsaglia
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