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VCD 8 6241 loosing 5 volts supply

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#60920

VCD 8 6241 loosing 5 volts supply | 25 January, 2010

I am working on a vcd 8 with a problem of loosing the 5 volts supply. We have fitted a new supply that also provides the 15 volts. When we remove the connector on the power chassis for the 5 volts the power supply shows OK. When fitted the 5 volts is drawn down. Has anyone had this problem before? Is the fact that the 15 volts goes low as well a clue? Where does the VME chassis get its power from?

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#60975

VCD 8 6241 loosing 5 volts supply | 29 January, 2010

There are pots on the board in the power supply to adjust the voltages after the machine is powered up. The location of these pots are in the munual supplied with the machine

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rem

#60978

VCD 8 6241 loosing 5 volts supply | 29 January, 2010

Something on the 5v side is pulling it down. I would check every thing associated with the harness you are disconnecting. Your shorting somewhere! Don't have a schematic in front of me.

Also look for leads getting into the backside of your connector plugs.

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#60993

VCD 8 6241 loosing 5 volts supply | 1 February, 2010

Found the problem. Thanks for the pointers. I had set the voltage to 5.00 volts as it was reading 4.86 volts. I still had the problem. A slghtly burnt wire going into the spade connector on the back of fuse holder 12 (5 volts). The reason the voltage went low was when the harness was connected this wire caused a high resistance. The 5 volts supplys the back of the left hand I/O box and the lamps in the encoders. Machine been running a week now without a problem.

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#61021

VCD 8 6241 loosing 5 volts supply | 3 February, 2010

Good. another thing; the 5V is somewhat critical for the computer, so make sure that You have > 4.85 V - 5.2 Volts. That is on the computer power inlet, Not the on the power supply. /Best Regards

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