Hi,
I have been troubleshooting a machine, a carrier plating machine to be specific. This machine uses a FUJI F70 cpu (modular type plc) with a number of i/os. This plating is use to plate several types of material, including Cu, Sn & Ag. The client said that the problem started over 5 months ago, the machine is running well on Cu but having trouble with Sn & Ag. During this time, they would simply reset the system upon trouble & the machine would run for about an hour before having trouble again. For them, that was tolerable.
Around 4 months ago, this problem worsen. After resetting the system, it will run for around 2-3 cycles then the trouble arises. This time its no longer tolerable so they do not use the machine on Sn & Ag BUT still the machine is running good on Cu.
This is the problem:
1.) This machine has 5 carriers, among those only carrier 2 has apparent problem. Please see attachment
2.) Cu starts from no.9 whilst Sn (4-2) & Ag starts from no.8. During Sn & Ag the machine skips 1 position (ex. if the carrier should put the material @ no.11, it will load on 12) BUT this problem is not seen during Cu operation.
3.) I checked the program & i found out that the reason the machine skips 1 position is that there are times the limit switch on carrier2 is not detected. I thought of transferring this limit switch to another i/o BUT then again I thought, why this problem does not occur in Cu? All the process are the same except they start at different position.
Is this possibly a PLC trouble?
I have been troubleshooting a machine, a carrier plating machine to be specific. This machine uses a FUJI F70 cpu (modular type plc) with a number of i/os. This plating is use to plate several types of material, including Cu, Sn & Ag. The client said that the problem started over 5 months ago, the machine is running well on Cu but having trouble with Sn & Ag. During this time, they would simply reset the system upon trouble & the machine would run for about an hour before having trouble again. For them, that was tolerable.
Around 4 months ago, this problem worsen. After resetting the system, it will run for around 2-3 cycles then the trouble arises. This time its no longer tolerable so they do not use the machine on Sn & Ag BUT still the machine is running good on Cu.
This is the problem:
1.) This machine has 5 carriers, among those only carrier 2 has apparent problem. Please see attachment
2.) Cu starts from no.9 whilst Sn (4-2) & Ag starts from no.8. During Sn & Ag the machine skips 1 position (ex. if the carrier should put the material @ no.11, it will load on 12) BUT this problem is not seen during Cu operation.
3.) I checked the program & i found out that the reason the machine skips 1 position is that there are times the limit switch on carrier2 is not detected. I thought of transferring this limit switch to another i/o BUT then again I thought, why this problem does not occur in Cu? All the process are the same except they start at different position.
Is this possibly a PLC trouble?
Last edited: