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-   -   Surge Current (http://www.diyaudio.com/forums/solid-state/228611-surge-current.html)

MLStrand56 25th January 2013 02:12 PM

Surge Current
 
I don't see any forum for this problem, but it involves my Solid State pwr. amps, so I'll try it here 1st.

I have 5 x Yamaha MX-1000 power Amps. If they are all turned on at once, the Surge Current in the amps, trips the 20 Amp. ckt. breaker in the main Breaker Panel. If I turn them on individually, they will run fine (even Very Loudly) on the same 20 amp. ckt. breaker.

So what I need is a Line Conditioner(?) that will allow me to program a different AC Turn On Delay, for each amp.

Years ago I remember that a very expensive AC conditioner could do that (don't remember the brand or model), But it only had programable turn on delay, for 2 outlets. I need to sequence delay AC power to 5 pwr. amps.

I could build it myself, if I could find a schematic or PC board.

Any Ideas?

MLStrand56

Mooly 25th January 2013 02:20 PM

Ideas... use a high wattage low value resistor in series with the mains that is shorted out after a few 10's or 100's of milliseconds. Similar idea to the standard slow start for toroidal trannys.

Depends how you turn them all on of course... I'm assuming you throw one switch and they all power up.

tauro0221 25th January 2013 02:27 PM

Hi,
You can also use zero crossing SSR and turn each one in sequence in delay using a micro processor. the zero crossing SSR also prevent the inrush current. it is a simple application.

DF96 25th January 2013 02:41 PM

The thing you need is called a Power Sequencer.

MLStrand56 25th January 2013 02:51 PM

Power Sequencer
 
Quote:

Originally Posted by DF96 (Post 3341689)
The thing you need is called a Power Sequencer.

Thanks! At least now I know what to look for.

MLStrand56

MLStrand56 25th January 2013 02:58 PM

A Few Seconds
 
Quote:

Originally Posted by Mooly (Post 3341660)
Ideas... use a high wattage low value resistor in series with the mains that is shorted out after a few 10's or 100's of milliseconds. Similar idea to the standard slow start for toroidal trannys.

I'm assuming you throw one switch and they all power up.

Actually I need a power up delay of several seconds per amp.

Yes, I turn them on with a single switch. When I lived in USA, I wired a 30 amp service to the Amp Rack, & used a 120V Contactor to switch the 30 amp service. Now I live in Philippines & rent a house. The whole house only has 5 ckt. breakers (very common here)

MLStrand56

JMFahey 25th January 2013 03:49 PM

1) just turn them on sequentially, by hand.
Not that hard to do.

2) build a board with 5 555 timers, with varying delays (5/10/15 ... seconds) each driving a 220V rated relay with enough current capability to turn your amps on safely.
Plug your amps in the outlets in this controller, and leave them always on.
Now your On-Off switch is the small one which powers the controller/sequential delay board.

Something like this will do for 1 stage.
Repeat as needed
http://home.cogeco.ca/~rpaisley4/LM555PowerDelay.GIF
For a fuller discussion, how_to_calculate and other cool LM555 applications:
http://home.cogeco.ca/~rpaisley4/LM555.html

MLStrand56 26th January 2013 01:07 PM

555 timers vs. Delay
 
Quote:

Originally Posted by JMFahey (Post 3341787)
build a board with 5 555 timers, with varying delays (5/10/15 ... seconds) each driving a 220V rated relay with enough current capability to turn your amps on safely.
Plug your amps in the outlets in this controller, and leave them always on.
Now your On-Off switch is the small one which powers the controller/sequential delay board.

The 555 timers could be controled by the Master On/Off switch!!!

I'm Intreguied(sp?)!!!!!

MLStrand56

MLStrand56 26th January 2013 02:31 PM

I found a Carvin 10 ch. AC delay sequener on E-bay for $139. The "suggested" retail price is $489. It's WAY more than I need, but it's WAY cheaper than PANAMAX, which Doesn't do what I need.

MLStrand56

Bare 26th January 2013 07:15 PM

Geee all that effort and expense .. for naught.
Learn to turn them on in groups of less than five :-)
OR fit an uprated Mains breaker, or even upgrade the Wires to the single /circuit plug you use.. for All 5 of the contraptions


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