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, <n6...@comcast.net
<mailto:n6...@comcast.net>> 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:j...@wattwatchers.com.au
<mailto:j...@wattwatchers.com.au>]
*Sent:* Thursday, December 7, 2017 12:29 PM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
*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.
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