IanP
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To fully charge 5000µF capacitor through 1kΩ resistor you will need roughly 5 * R * C = 25s .. see picture below ..
If there is no voltage on one or more of these caps check SCRs as they may be ON and current through 1kΩ resistor will be enough to keep them ON .. If you have an oscilloscope take a look at C5 (SCR2) and C8 (SCR3) on power on ..
BTW, which caps are not charged: C3 or C6/C7?
Try this: disconnect SCRs (anode) and measure voltage on caps ..
Regards,
IanP
If there is no voltage on one or more of these caps check SCRs as they may be ON and current through 1kΩ resistor will be enough to keep them ON .. If you have an oscilloscope take a look at C5 (SCR2) and C8 (SCR3) on power on ..
BTW, which caps are not charged: C3 or C6/C7?
Try this: disconnect SCRs (anode) and measure voltage on caps ..
Regards,
IanP