JUMO 709040 TYA-110 thyristor power unit Operating Manual - Manual (Page 38)

5 Commissioning
38 Power units 02.06
Alternative setting:
Simulate a load failure, and then adjust the “load fail” trimmer so that the yel-
low “load fail” LED just lights up.
5.5.2 Setting for master-slave and free-running economy circuit
5.6 External changeover of operating modes
For this to be possible, an external switch must be wired between Terminal 8
and Terminal 6.
If the switches S12 and S13 are closed, an external changeover to phase-
angle control is not possible.
v Section 6.3 “Summary of possible settings”
5.7 Blown fuse indication
If a short-circuit occurs, the built-in semiconductor fuse switches within half a
supply cycle, to protect the thyristors. When the fuse is blown, the “fuse” LED
lights up,
v Section 8.2 “Replacing the semiconductor fuse”
With extra code TR or TO, an output signal is also available.
v Section 4.1 “Connection diagram”
H
When using master-slave and free-running economy circuits, the
settings must be made in both thyristor power units.
H
The smallest change of resistance that can be detected is 5% of
the nominal load resistance (10% in an economy circuit).
Switch Operating mode
open burst-firing mode
closed phase-angle control
H
The external switch can only be used to change from burst-firing to
phase-angle control when the internal switch S3 is open, since this
switch is in parallel with the external switch S.