CMC 353 Reference Manual
22
4.1.2 Current Output (Current Amplifier)
Figure 4-3:
CMC 353 current outputs
The current amplifiers are implemented as switched mode amplifiers with
DC coupling. With this technology it is possible to achieve high power
density in a very compact structure. The DC coupling enables a precise
reproduction of transients or DC offsets.
Protecting the Current Outputs
All current outputs are protected for open circuits, short-circuits, and
overload. If the heat sink overheats, a thermo switch turns off all outputs.
The output sockets are internally protected against currents > 45A
peak
(32A
rms
; the CMC 353 switches off with the error message "current on
neutral too high").
In non-operative state, relay contacts (as illustrated in figure 5-3) protect the
current amplifier from external power by shortening the outputs to N.
Caution: If there is an in-feed from an external source, the current outputs
can be damaged or destroyed.
Overload Warning Flagged in the Software
When a current output is overloaded, a corresponding warning is displayed
in the user interface of the test software of the OMICRON Test Universe
(like described in, for example, section 8.3, "Overheating" on page 73).
Please see also section 7.1, "Safety Instructions for High Current Output" on
page 65 about
The three current outputs have a
common N and are galvanically
separated from all other connections of
the CMC 353.
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