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(Example sequence of two shots.
After shot 2 the fault is cleared.)
Figure 6.4 – AR Signals
1. Current exceeds the I> setting; the start delay from shot 1 starts.
2. After the start delay, an OpenCB relay output closes.
3. A CB opens. The dead time from shot 1 starts, and the OpenCB relay
output opens.
4. The dead time from shot 1 runs out; a CloseCB output relay closes.
5. The CB closes. The CloseCB output relay opens, and the
discrimination time from shot 1 starts. The current is still over the I>
setting.
6. The discrimination time from the shot 1 runs out; the OpenCB relay
output closes.
7. The CB opens. The dead time from shot 2 starts, and the OpenCB
relay output opens.
8. The dead time from shot 2 runs out; the CloseCB output relay closes.
9. The CB closes. The CloseCB output relay opens, and the
discrimination time from shot 2 starts. The current is now under I>
setting.
10. Reclaim time starts. After the reclaim time the AR sequence is
successfully executed. The AR function moves to wait for a new AR
request in shot 1.
6-15
Control Functions
857-UM001A-EN-P – July 2009
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