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Old 5th December 2004, 08:50 PM   #1
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Default rectifier board not working after putting on bypass caps.

hello!

my rectifier board with 8 mur1520 diodes stopped working after i installed bypass diodes to take care of diode ringing.
I measure voltage into the board, but nothing out of it.

i put the caps in paralell with the diodes. they are 0.15uf 63V devices, polypropylen i think.
what have i don wrong?

regards
marius
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Old 5th December 2004, 09:16 PM   #2
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.... the soldering, maybe. I suggest that you check the connections once more. Do you have any AC voltage into the rectifier?
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Old 5th December 2004, 09:40 PM   #3
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i checked all the connections, they are all correct.
Yes, AC in to the rectifier, dead/nothing out.
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Old 5th December 2004, 10:08 PM   #4
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Have you checked the diodes with a DVM? Do have have any voltage across the diodes? How many volts across the AC inputs of the bridge?
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Old 5th December 2004, 10:20 PM   #5
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DVM?

and volt across the diodes? well i would guess so, considering that they manage to create ground. so at least four of the eight..

17.8V ac across the inputt

thank's for helping!
marius
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Old 6th December 2004, 05:51 AM   #6
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... you don't guess, you have to know. Just measure! If you don't have experienced any smokeand blown fuses I'll doubt that you have broken the diodes. You carefully and nice have soldered in caps in parallel of the diodes and now nothing is working. You can actually use DVM and the "diode test" and check the diodes. You should get 0.5-0.7 volt in forward direction and much higher in the reverse direction, not necessarilly 1.999 if the bridge is connected.

You should also check you wiring.
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Old 6th December 2004, 06:03 AM   #7
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Default Re: rectifier board not working after putting on bypass caps.

Quote:
Originally posted by demogorgon
hello!

my rectifier board with 8 mur1520 diodes stopped working after i installed bypass diodes to take care of diode ringing.

before you installed bypass caps,what about the rectifier runing?
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Old 6th December 2004, 08:57 AM   #8
Nuuk is offline Nuuk  United Kingdom
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Would he need to connect a load to measure the bridge?
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Old 6th December 2004, 09:55 AM   #9
Markje is offline Markje  Netherlands
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If you connect a load, it will finfluence your measurement. If you measure diodes, the best way is to desolder them, otherwise, you should measure what peranders is saying, .5 to .7 in one way and something else in the other way (depending on the diode you are measuring).

Greetz Mark
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Old 6th December 2004, 09:58 AM   #10
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You can do pretty good troubleshooting also when the diodes are connected.
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