A web search for 'OPTOMOS pilot duty rating' produces useful
information, including references to UL508. But it seems that these are
contact ratings for switching inductive loads (other relay coils). Since
you have the double zener to absorb the inductive kick, you would only
need, it seems, the opto to have pilot rating if the zener fails
open-circuit.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2017-12-07 21:45, Jon Keeble wrote:
We are getting a somewhat innovative product through UL at the moment.
So there has been quite a lot of discussion and feedback from UL.
But when UL said they thought my little board needed a pilot rating I
really thought they were joking.
Jon Keeble
On Fri, Dec 8, 2017 at 8:31 AM, <[email protected]
<mailto:[email protected]>> wrote:
I looked at the subject line and thought about something
completely unrelated – pilot ratings. I have a PP-ASEL IA.
Private Pilot – Airplane, Single Engine, Land Instrument
Airplane. 😊 And you?
Ghery S. Pettit
*From:* Jon Keeble [mailto:[email protected]
<mailto:[email protected]>]
*Sent:* Thursday, December 7, 2017 12:29 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* [PSES] Pilot rating
I am using a Panasonic AQH3213A PhotoMOS optical isolator to
control a small contactor.
At 110VAC the contactor coil draws 30mArms.
The coil contacts are wired to a PCB via a terminal block plug and
socket.
On the PCB is a series 10ohm fusible resistor, and a SMBJ400AC
bidirectional zener.
When the switch opens at peak current (42mA) there is 0.1J of
energy in the coil that gets absorbed by the zener.
The zener
* clamps at a voltage way below the voltage rating of the optoMOS
switch.
* is rated at 600W for 8.3msec and is subject to only 13W for a
similar period.
The UL test engineer says that the optoMOS should be "pilot
duty" rated (the part I am using does have this rating).
Does anyone know what triggers the requirement for a "pilot duty"
rating?
Is this defined in a standard somewhere?
This useful link identifies "contact rating codes"
https://na.industrial.panasonic.com/blog/what-pilot-duty-rating-how-it-obtained
<https://na.industrial.panasonic.com/blog/what-pilot-duty-rating-how-it-obtained>
The lowest rating E300 is for 110V 1.8A (make) 0.3A (break)
Technically speaking, my switch is not connected to the contactor
.. there is a two-component network in between
Does UL have the capacity or procedures in place to understand and
accept a circtuit analysis that shows my circuit as safe?
Jon Keeble
Wattwatchers.
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to <[email protected] <mailto:[email protected]>>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
<http://www.ieee-pses.org/emc-pstc.html>
Attachments are not permitted but the IEEE PSES Online Communities
site at http://product-compliance.oc.ieee.org/
<http://product-compliance.oc.ieee.org/> can be used for graphics
(in well-used formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to
unsubscribe) <http://www.ieee-pses.org/list.html>
List rules: http://www.ieee-pses.org/listrules.html
<http://www.ieee-pses.org/listrules.html>
For help, send mail to the list administrators:
Scott Douglas <[email protected] <mailto:[email protected]>>
Mike Cantwell <[email protected] <mailto:[email protected]>>
For policy questions, send mail to:
Jim Bacher <[email protected] <mailto:[email protected]>>
David Heald <[email protected] <mailto:[email protected]>>
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to <[email protected] <mailto:[email protected]>>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities
site at http://product-compliance.oc.ieee.org/ can be used for
graphics (in well-used formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to
unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <[email protected] <mailto:[email protected]>>
Mike Cantwell <[email protected] <mailto:[email protected]>>
For policy questions, send mail to:
Jim Bacher <[email protected] <mailto:[email protected]>>
David Heald <[email protected] <mailto:[email protected]>>
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc discussion
list. To post a message to the list, send your e-mail to <[email protected]>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <[email protected]>
Mike Cantwell <[email protected]>
For policy questions, send mail to:
Jim Bacher: <[email protected]>
David Heald: <[email protected]>
