SIRIUS 3RR2 current monitoring relays
8.8 Operation
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
723
Memory
Definition of Memory
The "Memory" setting controls how the device behaves following current overshoot or
undershoot/fault message and subsequent return to the normal range/troubleshooting within
the hysteresis limits.
There are two possible settings:
● Automatic reset (Memory = no)
If the device is set to automatic reset, following an error message, the relay will switch
back to the initial state once a previously occurring error has been dealt with. If a
reclosing delay time (RsDel) has been set, this is also taken into consideration. The relay
does not switch back to the initial state until this time has elapsed.
● Manual RESET (Memory = yes)
If manual RESET is selected in the settings menu, the relay will remain in the current
switching state following an error message, even if a previously occurring error has been
dealt with.
Note
Reset with manual RESET
Tripping is confirmed by disconnecting and reconnecting the supply voltage or by
pressing both of the arrow keys simultaneously for at least 2.5 seconds. The device then
resumes monitoring.
Explanation
If the device is set to automatic reset, the CO contact and the semiconductor output will
respond once a previously occurring error has been dealt with and the reclosing delay time
has elapsed. A previously occurring error is, therefore, not saved.
If manual RESET is selected, the CO contact remains in the current switching state even if a
previously occurring error has been dealt with.
This saved fault condition can be reset by pressing both arrow keys at the same time or by
disconnecting and reconnecting the auxiliary voltage.
Note
Semiconductor output
The semiconductor output always responds in automatic reset.
Factory setting
The device is factory-set to automatic reset.
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