Re: [PSES] Recommendations for DC-DC converter

Concur about below vendors and Ed's comments. Need to look at the power supply installation instructions and Conditions of Acceptability. Wrote some install instructions for a model series stating that output is floated, so grounding of output not recommended unless noise currents returned to/u

Re: [PSES] Recommendations for DC-DC converter

Scott: I didn’t want to drop names about vendors, but Vicor has been my favorite for smart power supplies since I crashed into the same problem (on a smart bomb system around 1990) that you are now seeing. Vicor made commercial and MIL grade units, and they even offered an auxiliary module (

Re: [PSES] Insulation testing

Hi John, You could change the design to have Reinforced Insulation between mains and chassis. That would be the "easiest" solution... for the test lab/agency ;). Earthed SELV should only require Basic Insulation to mains, as long as the earth connection can meet the requirements for protective ea

Re: [PSES] Insulation testing

Hello John, One common interpretation is that you use the test voltage for double/reinforced insulation when testing between mains and user accessible circuits even when the user accessible circuits are referenced to an earth grounded chassis. Here is the rationale. Any given user accessible c

Re: [PSES] Insulation testing

Are you testing just line/neutral. To ground? From: Harrington, John Sent: Thursday, February 25, 2016 10:45 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Reply To: Harrington, John Subject: [PSES] Insulation testing Gentlemen, How do you demonstrate the dielectric strength between mains and user accessib

[PSES] Insulation testing

Gentlemen, How do you demonstrate the dielectric strength between mains and user accessible circuits when the accessible circuits are referenced to chassis? If you apply the test voltage for reinforced insulation to the mains circuits and it breaks down to chassis because there is (as required)

Re: [PSES] Recommendations for DC-DC converter

Hi Ed, I believe you hit the nail on the head, figuratively. The problem is the use of a commercial DC-DC converter that is not meeting the required specification. The product and components must fit in a tight space, and spacing is extremely tight, so there is limitations on the external compon

[PSES] NRTL required for field equipment approval

I’m looking for assistance with field approval for some automated test equipment destined for a US automotive factory. Please would anyone interested in working with Conformance on this (or who can recommend someone who may be interested in working with Conformance) contact me directly. Thanks