Ws-12-dc reboots randomly

[expohl]

I have noticed when I remove AC power and fail over to battery power ( I.e. going from 28vdc input voltage to 24vdc input) will cause multiple of my ws-12-dc switches to cold boot...

They are not loosing power... Why is this happening ?

[Julian]

The ws-12-dc is not designed to work directly off of batteries. That's why the 12-250-DC is more expensive, it conditions input power to stop the occasional brownout from happening.

Unless you're saying your batteries are regulated. Honestly, I need more information, can't just gaze into my crystal ball and read tea leaves regarding your setup.

Do you mind sharing a drawing of your setup?

[lligetfa]

As Julian said, these are meant to be powered by conditioned 48V as per:

This unit is NOT our "SMART" DC to DC so it expect conditioned 48V DC input +/-. This switch is for sites that already have conditioned 48V. If you want the unit that accepts 9-60V DC input then you want the WS-12-250-DC

I am surprised it even runs at 28V.

[expohl]

I'm talking about the 9-60v units.. ws-12-250-dc

[Julian]

so, as i said earlier, i need more information about your setup, specifically power conditions during failover, to be of more assistance.

You say cold boot, what do you mean? The standard boot sequence is: Apply power -> ~10 seconds for DC-DC converter to wake up and apply power to board-> fans come on full -> full console crawl, takes about a minute -> applies power to POE loads.

Are you seeing that entire sequence, or is it just not passing traffic for ~30sec?

Hooked one up to my variable DC supply, went from 28-24v, was unable to duplicate..

the more information i have, the more helpful i can be.

[sirhc]

Maybe post up a wiring diagram showing how the WS-12-250-DC is powered.

Post up your config Tabs:
Status Tab
Power Tab
Device/Config Tab