[SML] 60Hz gear in a 50Hz World

[Ford Sellers]

What Jerry said… we use a Buck-N-Boost here to check on 50hz.
And… by the way… what the heck is with Japan’s 100v, 50hz… are they just trying to be difficult?

From: Stagecraft [mailto:stagecraft-bounces at theatrical.net] On Behalf Of Jerry Durand via Stagecraft
Sent: Wednesday, February 28, 2018 6:47 PM
To: Mt. Angel Performing Arts Center via Stagecraft <stagecraft at theatrical.net>
Cc: Jerry Durand <jdurand at interstellar.com>
Subject: Re: [SML] 60Hz gear in a 50Hz World

That's about the long and short of the waveform.  From the "intelligence" I've seen in dimmer designs, I bet the show on it.

Suggestion:  Borrow a generator from someone that won't get TOO pissed if you mess with the throttle and turn it down to 50Hz, then you can test your dimmers.

Don't forget to re-time the generator before returning it!
On 02/28/2018 03:17 PM, Mt. Angel Performing Arts Center via Stagecraft wrote:

The answer is 'probably', based on my experiments with building DMX controlled whizbangs. Jerry probably has much more info than I.

IME a well-designed pack will determine the zero-crossing time of the power source and phase lock its internal clock so that zero-crossing interval is 256 magic units. Then the DMX sends a 0-255 number and (after maybe doing some cosine adjustment) the controller PWMs (pulse width modulates) the output when the two match.

If the dimmer pack isn't quite so smart and is designed for 60HZ only then either you won't get full brightness at 100% or fully 'out' at 0% depending on how the controller logic works.

Carla

I saw a woman wearing a sweat shirt with "Guess" on it. So I said "Implants?" She hit me.



--

Jerry Durand, Durand Interstellar, Inc.

www.interstellar.com<http://www.interstellar.com>

tel: +1 408 356-3886

@DurandInterstel


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