PLC 24 VDC output vs. Test bench 24 VDC output

AdamMayotte · Feb 27, 2007

Hello,

I am working on a 24 VDC Burkert Solenoid Valve. When bench testing it with a regular switching 24 VDC power supply I was unable to get the solenoid to engage but when re-installing the valve into service the PLC can drive the solenoid with no problems.
I am wondering why a PLC can drive the solenoid but a power supply in my shop can't. Anyone have an idea?

Thanks,
Adam

MikeHalloran · Feb 27, 2007

Your benchtop supply probably has "foldback current limiting", which is a feature used to protect experimental circuits from destruction. It's not so useful in testing serious loads with high inrush currents.

Happened to me 35 years ago; a small 12A/24VDC linear actuator drew a peak of ~275A when first switched on ... from a battery. Our QC department had declared it DOA when their 15A supply wouldn't start it.

Mike Halloran
Pembroke Pines, FL, USA

jraef · Feb 28, 2007

I agree, very common feature on benchtop power supplies.

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PLC 24 VDC output vs. Test bench 24 VDC output

AdamMayotte

Industrial

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MikeHalloran

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jraef

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