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.
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