[RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions

[Glenn Burt]

Looks like they use 24VDC for contactor activation, not 120VAC.

 

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
Behalf Of Mark Frye
Sent: Monday, February 02, 2015 1:29 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions

 

OK. So did you run a line 120V up to the box on the roof to energize the
coil of the relay up there?

Mark Frye

On 2/2/2015 9:13 AM, Jerry Shafer wrote:

The units we have used have a large contactor inside the combiner box made
by AMtec Solar. this was required to control the shut down includes a fire
button done on the ground floor

Jerry

 

On Mon, Feb 2, 2015 at 5:49 AM, Mark Frye <markf at berkeleysolar.com> wrote:

Jerry,

What unit did you use?

Mark Frye 

 

On 2/2/2015 7:43 AM, Jerry Shafer wrote:

Wrenches
We have installed some of these rapid shut down units and they are always
located close to the array and ours kill the DC instantly as long as the
inverter was running when this accures did not test it with inverters
already off.
Jerry

On Feb 2, 2015 5:34 AM, "Christopher Warfel"
<cwarfel at entech-engineering.com> wrote:

We have a interpretation problem among some people I work with with, and
690.12 Rapid Shut Down and the the 10 second time for reducing ac and dc
conductors to 240ma, and 30V.  The word "initiation" seems to indicate that
all affected conductors need to be at these levels within 10 seconds of
de-energizing either the ac or dc conductors. If so, then the disconnects
need to be co-located to meet this requirement if this interpretation is
correct.

I have read Mr. Brook's article in Solar Pro, but AHJs may feel differently.

Would anyone care to weigh in on their interpretation?

Thank you, Chris





-- 
Christopher Warfel, President
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
401-466-8978


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