continuity test - Electronic Circuits Projects Diagrams Free

barcode · 29th August 2007, 02:39 AM

I came across a machine the other day with a check station, this station is checking for continuity on a previously installed wiring harness. and I was wondering if there is another way of doing it. they seem to be just feeding +24vdc to one pin and waiting for it to come back to the PLC card on the other pin, this works but the operators have figured out how to short the pin to the frame of the machine which results in blowing the fuse or shorting the card.

if I were to isolate a separate voltage supply say five volts and not ground it to the common ground then it should not short basically i think.

ericgibbs · 29th August 2007, 06:29 AM

Quote:

Originally Posted by barcode

I came across a machine the other day with a check station, this station is checking for continuity on a previously installed wiring harness. and I was wondering if there is another way of doing it. they seem to be just feeding +24vdc to one pin and waiting for it to come back to the PLC card on the other pin, this works but the operators have figured out how to short the pin to the frame of the machine which results in blowing the fuse or shorting the card.

if I were to isolate a separate voltage supply say five volts and not ground it to the common ground then it should not short basically i think.

hi,
As the 'output end' of the wire in the cable harness is connected to the input of a PLC, isnt it possible to fit a current limiting resistor in the +24Vdc feeding the 'input end' of the wire?
After all, you are only testing for continuity not a resistance value.

Eric

Pommie · 29th August 2007, 06:57 AM

Quote:

Originally Posted by barcode

but the operators have figured out how to short the pin to the frame of the machine which results in blowing the fuse or shorting the card.

I think you are going about this the wrong way, the above should be a sackable offense.

Mike.

29th August 2007, 02:39 AM	(permalink)
barcode New Member	continuity test I came across a machine the other day with a check station, this station is checking for continuity on a previously installed wiring harness. and I was wondering if there is another way of doing it. they seem to be just feeding +24vdc to one pin and waiting for it to come back to the PLC card on the other pin, this works but the operators have figured out how to short the pin to the frame of the machine which results in blowing the fuse or shorting the card. if I were to isolate a separate voltage supply say five volts and not ground it to the common ground then it should not short basically i think.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Latest
Good Electronic Supply's Sites, Everyone Come On In! :P	Electric Rain	General Electronics Chat	44	27th August 2007 11:05 PM
design of a continuity tester	pc88	Electronic Projects Design/Ideas/Reviews	2	12th June 2007 04:25 PM
faulty digital components testing,checking	walters	General Electronics Chat	5	22nd August 2005 07:10 PM
Building a test set.	Freezerburn	Electronic Projects Design/Ideas/Reviews	2	3rd May 2005 01:15 PM
ya	mari_69	Micro Controllers	4	7th June 2004 01:29 PM