[j-nsp] MX10008 power supply configuration

[Mark Tinka]

On 2/17/24 17:12, Vincent Bernat via juniper-nsp wrote:

> Hey!
>
> I am a bit lost on how the MX10008 power supplies work. My main 
> question is how much power will be drawn if a power feed is lost?
>
> If we take the JNP10K-PWR-AC2 dual feed with high power (30-A) 
> setting, configured for dual feed, it can draw 5500 W. In Europe 
> (230V), I suppose it means it will draw 12A on one feed and 12A on the 
> other. This is not clearly stated.
>
> What happens if we lost one feed? I suppose it would fall back at 5000 
> W, so it would draw 22A on the remaining feed, but maybe it could just 
> fallback to half the power at 12A?
>
> If it would fallback at 5000 W, I don't understand why there are DIP 
> switches to configured mono or dual feed. We could just not plug the 
> second feed and be done with it.
>
> Also, on the power supply, there are these markings:
>
> INPUT1 OR INPUT2: PER INPUT 28.5A, 5000W MAX
> INPUT1 AND INPUT2: PER INPUT 16A, 5500W MAX
>
> But again, it is unclear if the choice is done by configuring the 
> switches or if this depends on the number of actuel inputs used. If I 
> configure the DIP switches to use both input, do I still get 16A per 
> input if one feed fails?
>
> Ideally, when configured in high power mode, it could fallback to 
> ~3700W when on one feed, but I suppose this would marked more clearly 
> in the documentation. This would mean 33kW when full, 16.5kW when 
> loosing half the power supplies (unlikely if they are dual feed) and 
> 22kW when loosing one feed.
>
> Otherwise, we'll run in 20A mode, get 30kW with 6 power supplies, or 
> 15kW with half of them or 16.2kW with half of the feeds.

Sounds like the kind of question best answered by your SE.

Mark.