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Author Topic: Lab power supply PS303D and powerware 9120 (700w) UPS  (Read 2668 times)

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Offline Hrvoje-CROTopic starter

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Lab power supply PS303D and powerware 9120 (700w) UPS
« on: November 20, 2014, 05:24:38 pm »
Hi again!

Sometimes when i switch on my PS303 0-30V/0-3A lab PSU, UPS shows message "Bus unbalance!!!". So, is it possible and normal situation in which that power supply draws too much current in start? Due to magnetization of transformers core?

Thank you!
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Offline con-f-use

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Re: Lab power supply PS303D and powerware 9120 (700w) UPS
« Reply #1 on: November 20, 2014, 09:08:20 pm »
Yes, it's called inrush current.
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Offline SebG

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Re: Lab power supply PS303D and powerware 9120 (700w) UPS
« Reply #2 on: November 21, 2014, 01:32:12 am »
In power supplies, usually the inrush current is due to filtering capacitors, on the DC side, being charged.  The capacitors would be somewhere on the order of few mF (=1000uF). 
David has a video where he talks about inrush current:
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Sebastian
 
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