Follow up with Jay, We thought it might help others to post what we found with Jay's system. This was a Magnum MS4024PAE model that is 120/240 split phase input and output. We describe this unit as 2-2k units in series inside one unit with a two winding transformer basically an autoformer.
The issue Jay was having was a "Overtemp" fault when charging from generator after an hour or so. The first tech suggested turning down the charge rate to 70% which solved the issue but didn't answer the question of why the unit was in "Overtemp". The first suspicion was there was 120v into the inverter which will cause the transformer to run on half the windings and overheat at full charger output. It is perfectly acceptable to input 120v to the MS-PAE (either leg) and it will charge and the output will be 240v but the charge rate should be reduced. The voltage measurement to the input terminals was 240v so that issue was not suspected anymore. What Jay found was one pole of the 240v breaker from the generator was bad. What made it hard to troubleshoot and the reason for the post is that the MS-PAE will accept 120 or 240 input but always convert to 240 output. When measuring the input to a MS-PAE you should remove the wires from the terminal block and take the readings on the wires. The sense transformer on the inverter input will make the input look like 240v but no current on one leg will overheat the transformer. With the wires removed the voltage measurement will show there is no 240v available. Gary Gary Baxter Product Manager Magnum | Dimensions 2211 West Casino Rd. Everett, WA. 98204 Office 425.353.8833 | Mobile 425.501.0289 | Fax. 425.353.8390 Please Note My New Email Address: gbax...@sensata.com | www.magnumenergy.com A Sensata Technologies Business Unit -----Original Message----- From: Baxter, Gary Sent: Thursday, October 23, 2014 9:50 PM To: RE-wrenches Subject: Re: [RE-wrenches] magnum question Hi Jay, Sorry you didn't get help. Let me know what you need and I will get you an answer. Gary Baxter Product Manager Magnum/Dimensions > On Oct 23, 2014, at 9:19 PM, jay peltz <j...@asis.com> wrote: > > HI All, > > Does anyone have a person at Magnum in engineering or higher up than tech > support. > > I've got a problem with an inverter that tech support won't or can't help > with. > > thanks > > jay > > peltz power > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
