JUMO 709040 TYA-110 thyristor power unit Operating Manual - Manual (Page 35)

Power units 02.06 35
5 Commissioning
5.3 Setting the current limit
Internal current
limiting Current limiting is only possible in the phase-angle mode of control.
h The trimmer (5) “current limit” on the front panel can be used to limit the
effective (rms) value of the load current over a range from 10 — 100% of
the rated current for the thyristor control unit (I
ThyN
).
1.5 turns clockwise correspond to increasing the threshold by about 10%
of the rated current.
The red LED lights up when the current limit is reached. Current limiting is
achieved by limiting the “ON” phase angle so that the set value for effective
current is not exceeded.
External cur-
rent limiting An external voltage signal in the range 0 — 10 V can be applied to Terminal 9
to influence the internal current limit I
max
set by the “current limit” trimmer.
0V means no effect, 10 V means the maximum effect (the threshold is reduced
to the smallest value possible).