Discuss Siemens RCCB trips even while inductive motor is off in the Industrial Electrician Talk area at ElectriciansForums.net

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The same transformer that provides the supply to the 'Power fail' relay has another secondary coil which provides the 24V ac for the various electrically operated solenoid valves(V1 etcetera). The load of one or more of these valves being energised could be loading the transformer such that the voltage to the 'Power fail' relay has a temporary dip, opening it's contacts briefly, and then recovering to close the contacts - yet the PLC detects the brief opening of the contacts and assumes a 'Power Fail' has happened.

Check the output voltages of the secondary coils and also any marking for the voltage rating of the primary coil - is the primary suited to 208V or is it a 220V/230V/240V primary?
 
The same transformer that provides the supply to the 'Power fail' relay has another secondary coil which provides the 24V ac for the various electrically operated solenoid valves(V1 etcetera). The load of one or more of these valves being energised could be loading the transformer such that the voltage to the 'Power fail' relay has a temporary dip, opening it's contacts briefly, and then recovering to close the contacts - yet the PLC detects the brief opening of the contacts and assumes a 'Power Fail' has happened.

Check the output voltages of the secondary coils and also any marking for the voltage rating of the primary coil - is the primary suited to 208V or is it a 220V/230V/240V primary?
The situation is that the RCCB actually trips.
 
Have you carried out any tests on the RCCB in case that is at fault?
 
You have not answered whether the supply has a neutral.

Also you have not confirmed whether the neutral at the RCCB has been 'grounded' which I said was wrong.

You have not yet measured any voltages as I asked.

:-(
 
The RCCB may not be faulty. It is certainly not correct and potentially dangerous to connect - as said in the image below the lower terminals in #18 - the neutral from the RCCB to earth/ground (especially since there is a filter in the supply lines - forgive me but I will not explain why).

The wiring diagrams I have looked at show no neutral coming out of the RCCB only one going in to it - see page 178 of 196 in manual.

Could you/your company not buy one of these:


The autoclave requires a 5 wire supply providing L1, L2, L3, N and E - HAS IT!!!!!!!!! If it does not then the first thing to do is provide a 5 wire supply with a neutral.

I am becoming exasperated with you hence the bold annoyed text.
 
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