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Suggestion: Macron MPT-xxx and MPT-xxx2

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Re: Suggestion: Macron MPT-xxx and MPT-xxx2

Postby LongRunner » August 21st, 2014, 8:54 pm

Considering that momaka's MPT-301 had a seized Superred fan, I indeed don't exactly see fit to let it slide with no deductions. Pentium's comment that it "seems to run cool for an old half bridge unit" (a few surprisingly efficient half-bridge designs were tested in the previous el-cheapo round-ups), along with momaka's comment that it has good regulation for a group-regulated design (bettered only by Hipro IIRC) suggests that it could indeed be a worthy unit (for use in old PCs) after recapping (and a new fan if Superred), but that's something we won't know for sure until this year's round-up is complete.
Information is far more fragile than the HDDs it's stored on.

Smart people don't buy "smart" devices without very carefully weighing up the risks and benefits beforehand.

My PC: Core i3 4130 on GA-H87M-D3H with GT640 OC 2GiB and 2 * 8GiB Kingston HyperX 1600MHz, Kingston SA400S37120G, WD3003FZEX-00Z4SA0 and HDS721010CLA630, Pioneer BDR-209DBKS and Optiarc AD-7200S, Seasonic G-360, Chenbro PC31031, Linux Mint Cinnamon 20.2 (with Windows 7 still accessible if needed).
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Filter choke (over)loading, odd MOV connection

Postby LongRunner » December 12th, 2021, 10:50 pm

I wrote:In the earlier 80mm-fan version, which had a mains pass-through outlet, the wiring arrangement placed that outlet between the two stages of the EMI filter.
[…] if too much current is drawn through that outlet (especially with the unit in standby mode), the filter choke could get rather hot.

Confirmed; up to 4.17A (1000W @ 240V) is fairly safe (≈55K rise on the neutral winding, assuming 105°C as the maximum allowable), but 5.83A (1400W @ 240V) is pushing it and the full 10A would surely toast it. (The switch is rated 6A, so testing to about that seems fair.) However, the filter PCB does have two through-holes besides the inlet pins, so you can re-arrange the connections to put the outlet before the filter (and switch).

Another MPT-xxx nit I found is the use of a single 220V MOV (ZNR1) from one AC terminal to the mid-point of the bulk capacitors; on 115V this works fine, but on 230V it will just shunt the surges across one bulk cap and into the other (which one depending on the polarity of the surge). So I would recommend installing a 470V MOV in the position ZNR2 (just after the fuse); since these (at least those sold in 230V markets) usually lack the voltage selector, you can then remove ZNR1. Later PCB revisions also support the normal two MOVs across bulk caps (ZNR3 and ZNR4), and the MPT-xxx2 finally used them.
Information is far more fragile than the HDDs it's stored on.

Smart people don't buy "smart" devices without very carefully weighing up the risks and benefits beforehand.

My PC: Core i3 4130 on GA-H87M-D3H with GT640 OC 2GiB and 2 * 8GiB Kingston HyperX 1600MHz, Kingston SA400S37120G, WD3003FZEX-00Z4SA0 and HDS721010CLA630, Pioneer BDR-209DBKS and Optiarc AD-7200S, Seasonic G-360, Chenbro PC31031, Linux Mint Cinnamon 20.2 (with Windows 7 still accessible if needed).
LongRunner
Moderator
 
Posts: 906
Joined: May 17th, 2013, 5:48 pm
Location: Albany, Western Australia

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