Hibernate and wakeup voltage issue

[vincent.perez]

Hello,

I'm working for BJT Partners in France. We bought several Netonix switches for our network deployment.We are currently trying to tweak the wakup voltage and hibernate voltage.

I'm running tests at the office with a WS-12-250-DC and I can't make it work properly. I tried with the old firmware, the 1.4.6 and the 1.4.7rc9.
I'm using a adjustable digital power supply that is normally precise enough to modify the voltage to test this feature.
I modified the general wakeup voltage from the power tab to 19V. When I shut it down by lowering the voltage, then when I increase the voltage it sometime wakes up at 13 V like it used to before I changed the power setting. The behavior doesn't seem stable. Am I missing something ?
I attached some screenshots of the tabs of the netonix. (The warning in the log is due to the warning voltage)


Thanks in advance for your attention,

Vincent Perez
R&D Engineer
BJT Partners

[sirhc]

What are you powering this with?
If a power supply please provide the model # and capacity (Amps or Watts)


Try changing the Warning Voltage to be 1V lower than the wakeup Voltage.

Right now you have:
Warning: 19V
Hibernate: 10V
Wake up: 19V

Try:
Warning: 18V
Hibernate: 10V
Wake up: 19V

[vincent.perez]

I'm using this power supply: https://www.velleman.eu/products/view/?id=417650

I tried with your settings:
Warning: 18V
Hibernate: 10V
Wake up: 19V

The issue is the same, it just woke up at 13V. I checked with a voltmeter and the output power of the dc supply is compliant with the programmed output power.

[sirhc]

We have LAB tested this many times but Julian will LAB test it again and post on here shortly.
Please show me what the ERROR in the system Log is saying.

[vincent.perez]

Here is the log screenshot.

[Julian]

Lab tested this and was able to duplicate your failure using RC9. Have been in contact with engineering regarding this issue, we will get this sorted as soon as possible.

[sirhc]

OK, Julian was not aware of how this works.

It works as designed, let me explain.

So the DC2DC power supply has hard coded defaults which are to power down at 9V and power up at 10V

Once the switch board boots it tells the power supply what the 3 voltages are via I2C communications:
Warning: 18V
Hibernate: 10V
Wake up: 19V

So now if the voltage drops to 18V it will send a warning.
When the voltage drops below 10V it will Hibernate.
If you do not remove power from the switch it will wake up properly at 19V


HOWEVER, if you remove power from from the switch or input voltage drops below 9V at this time the DC2DC power supply will LOSE the 3 power settings from the switch and always wake up at 9V when power is reapplied.

Do you understand?

[sirhc]

So what we have decided is that we can allow the Micro on the Power Supply to stay ACTIVE down to 7V+/- so that it does not lose the 3 voltage values (Hibernate, Warn, Wakeup).

Also we have discovered that it could vary from unit to unit at what input voltage the power supply will completely shut down losing the 3 values.
So in a sense this is a BUG and we will correct that shortly and allow the Micro on the power supply to stay active and retain these 3 values to as low of voltage as possible.

[sirhc]

Since you have this unit on your bench I would suggest if you are good at soldering that you do the 0 Ohm Ground MOD explained in this post as it help protect the switch from Ground Current.

viewtopic.php?f=17&t=2493&p=17453&hilit=MOD#p17448

[sirhc]

When testing this on a bench do NOT move the voltages up and down with your power supply to fast as this is not real world when hooked to batteries. Moving the voltages around artificially fast can cause an I2C error between the switch and power supply which means no telemetry will be passed and the power supply will simply work off default values.

Adjust the voltages slowly as be aware that there is a 5 second delay when moving voltages down to Hibernate threshold. Meaning the voltage will need to drop below the threshold for 5 seconds before it hibernates.

When the voltage is moving backup it is pretty instant so as soon as it pass the wakeup voltage it wakes up.