Argon undervoltage, no phasing and init

argon

#1

My hardware configuration:
-Argon
-Small Mige
-STM32F4DISCOVERY board

Problems arise when:
-all of a sudden between two restarts, no phasing when powering on. Connecting to granity, there is no voltage, faults read undervoltage, LD3 SL error (undervoltage)

Controller works, I have input working but no drive to the servo

How it behaves:
-no drive, no phasing

Granity faults:

Fault as shown

SMT top right LED flashes red


#2

You use 2 psu ? Can you show all tabs from granity ?


#3

HV bus voltage seems low. Do you hear one or two relay clicks from Argon when you power-on the system?


#4

The Argon has its own PSU built inside, and I have an additional MW for 5V.

Same setup as this one:

G1
G2




#5

@Mika

I hear one loud click from the Argon.
Tomorrow I’ll check if the power gets to the Argon at all. I don’t have a multimeter at hand tonight.

My best hope for now is that it’s the fuse of the power input.


#6

Sorry that’s what i meant , one psu from argon and what is the second one.


#7

MW RS 25-24:
https://www.meanwell-web.com/en-gb/ac-dc-single-output-enclosed-power-supply-output-rs--25--24


#8

Look at GD wiki about R7 resistor issue on Argon, I suspect this could be your problem perhaps.

Also check if the output of the logic 24V psu is fine…it should be, but make sure anyway.

Cheers,
Beano


#9

Alright, after attacking it with a multimeter, the R7 resistor doesn’t give resistance, can it be that, then? Shouldn’t be a nightmare to replace if so.


#10

Yep, that’s the one…


#11

Thank you, replaced the resistor and it’s back to working. Good job on the fast diagnosis.


#12

You’re welcome :wink: Happy days for you!