L2234
Emax
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Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000460R0002
L2778
14.2.9.14 Double protections setting
Using the double protections setting, the PR123/P can save a set of alternative parameters for all the protections. The second set of parameters
(set B) can replace the default set (set A) by means of an external command. The passage from set A to set B can be made when there is a change
in the mains configuration or when there is an emergency capable of changing the load capacity and the short-circuit levels.
The second set of parameters (set B) can be enabled by:
- digital input provided with the PR120/K module. For instance, it can be connected to an auxiliary contact of a bus-tie;
- communication network, by means of the PR120/D-M (e.g. when the switch is scheduled);
- directly from the user interface on the PR123/P (see settings menu par. 14.5.4);
- with a time that can be specified by set A or set B after the circuit-breaker has closed;
- depending on a Vaux being installed.
In operation, the state (set A and set B) is indicated on the display.
The double setting is disabled by default. To enable it, see par. 14.5.4.1.
