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CD3200-1PH from 15A to 110A
User’s Manual
26
10.3
Action of the Limit Current
The Current Limit control the firing angle of the thyristor to maintain the RMS current under the set
value.
When the current exceeds this value, the voltage is decreased up to reach the current limit set
I Load <= I Limit Set
I Load > I Limit Set
10.3.1
Current Limit Set
The Current limit is set up through the R13 trimmer on Frontal Board PCB (see par. 11.1)
Turned completely in counter-clockwise sense, will be Current limit = 0%.
Turned completely in clockwise sense, will be Current limit = 100% of the Max value of current
transformer (25/0.05 ,50/0.05 o 100/0.05 depending on thyristor size).
Minimum current is 25% of the current transformer size’s. If load current is below this value make two
turns or more around current transformer. H.B. circuit also diagnoses fuse failure.
If the External current limit profiling is used, before turning the R13 trimmer, supplying with 10Vdc the
secondary analogic input (see par. 11.3.3)..
Caution:
this procedure must be performed only by qualified persons
