Plc battery change

bennie

New Member
Joined
2009
Posts
22
Geo
south africa
Hi can anyone help me with the sequence to change the battery on the plc I am running a ls 440
thanks
Bennie
 
I think you mean the PQC. There are several boards that have backup batteries. Step one would be to turn off the PQC, ground yourself with an earth wrist strap before touching the PCB, remove battery and test for current with a multimeter. If is below the rating printed on the side then replace with an equivalent.
 
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