2 safety cut-out in the power section, 5 settings – JUMO 709050 IPC IGBT Power Converter IPC 70A Operating Manual User Manual

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5 Settings

Alternative
setting option:

To simulate a load fail, adjust the „load fail adjust“ trimmer such that the yellow
„load fail“ LED lights up.

5.12.2 Safety cut-out in the power section

A safety cut-out occurs in the event of a defect in the choke or in the
semiconductor power module; the output voltage between terminals D and 1D
is switched off.

This state is indicated by the „load fail“ LED, and the fault signal relay drops
out.
This safety cut-out remains activated even when the fault has been remedied.
It can only be reset by disconnecting the voltage supply.

h Switch the device off briefly, and then on again

If in the event of a fault the semiconductor module goes low-resistance, it is
possible to produce the full voltage supply of the power section for the
consumer (load).

To safely disconnect the resulting overload and to protect the load, provide a
cut-out in the supply cable in the form of a CMC (Q) automatic cut-out or a
semiconductor fuse in addition to the protection circuit-breaker. An automatic
cut-out combining both functions can be used in the power section to cut out
the voltage supply.

The smallest change in resistance that can be detected is 5 % of the
nominal load resistance.

However, terminals D and 1D may still carry dangerous voltage from
the supply. They are not electrically isolated from the supply!