GE Multilin B30 Bus Differential System 5-1595 SETTINGS 5.7 CONTROL ELEMENTS5“Acknowledge” mode of operation. The acknowledging signal must appear within the time defined by the SELECTORTIME-OUT setting after the last activity of the three-bit control inputs. Note that the stepping up control input and three-bit control input have independent acknowledging signals (SELECTOR 1 ACK and SELECTOR 1 3BIT ACK, accordingly).• SELECTOR 1 POWER-UP MODE: This setting specifies the element behavior on power up of the relay.When set to “Restore”, the last position of the selector (stored in the non-volatile memory) is restored after powering upthe relay. If the position restored from memory is out of range, position 0 (no output operand selected) is applied andan alarm is set (SELECTOR 1 PWR ALARM ).When set to “Synchronize” selector switch acts as follows. For two power cycles, the selector applies position 0 to theswitch and activates SELECTOR 1 PWR ALARM . After two power cycles expire, the selector synchronizes to the positiondictated by the three-bit control input. This operation does not wait for time-out or the acknowledging input. When thesynchronization attempt is unsuccessful (that is, the three-bit input is not available (0,0,0) or out of range) then theselector switch output is set to position 0 (no output operand selected) and an alarm is established ( SELECTOR 1 PWRALARM ).The operation of “Synch/Restore” mode is similar to the “Synchronize” mode. The only difference is that after anunsuccessful synchronization attempt, the switch will attempt to restore the position stored in the relay memory. The“Synch/Restore” mode is useful for applications where the selector switch is employed to change the setting group inredundant (two relay) protection schemes.• SELECTOR 1 EVENTS: If enabled, the following events are logged:EVENT NAME DESCRIPTIONSELECTOR 1 POS Z Selector 1 changed its position to Z.SELECTOR 1 STP ALARM The selector position pre-selected via the stepping up control input has not beenconfirmed before the time out.SELECTOR 1 BIT ALARM The selector position pre-selected via the three-bit control input has not been confirmedbefore the time out.
