GE D60 Instruction Manual page 244

5.6 CONTROL ELEMENTS
The "rest" position (0, 0, 0) does not generate an action and is intended for situations when the device generating the
3-bit control word is having a problem. When
in
SELECTOR 1 TIME-OUT
edge", the pre-selected position is applied on the rising edge of the
The stepping up control input (
out mutually: once the stepping up sequence is initiated, the 3-bit control input is inactive; once the 3-bit control
sequence is initiated, the stepping up input is inactive.
• SELECTOR 1 3BIT MODE: This setting defines the selector mode of operation. When set to "Time-out", the selector
changes its position after a pre-defined period of inactivity at the control input. The change is automatic and does not
require explicit confirmation to change the selector position. When set to "Acknowledge", the selector changes its posi-
tion only after confirmation via a separate acknowledging signal. If the acknowledging signal does not appear within a
pre-defined period of time, the selector rejects the change and an alarm established by invoking the
FlexLogic™ operand for 3 seconds.
ALARM
• SELECTOR 1 3BIT ACK: This setting specifies an acknowledging input for the 3-bit control input. The pre-selected
position is applied on the rising edge of the assigned FlexLogic™ operand. This setting is active only under the
"Acknowledge" mode of operation. The acknowledging signal must appear within the time defined by the
setting after the last activity of the 3-bit control inputs. Note that the stepping up control input and 3-bit control
TIME-OUT
input have independent acknowledging signals (
• 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 up
the relay. If the position restored from memory is out of range, position 0 (no output operand selected) is applied and
an 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 the
5
switch and activates
dictated by the 3-bit control input. This operation does not wait for time-out or the acknowledging input. When the syn-
chronization attempt is unsuccessful (i.e., the 3-bit input is not available (0,0,0) or out of range) then the selector switch
output is set to position 0 (no output operand selected) and an alarm is established (
The operation of "Synch/Restore" mode is similar to the "Synchronize" mode. The only difference is that after an
unsuccessful 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 in
redundant (two relay) protection schemes.
• SELECTOR 1 EVENTS: If enabled, the following events are logged:
EVENT NAME
SELECTOR 1 POS Z
SELECTOR 1 STP ALARM
SELECTOR 1 BIT ALARM
5-154
SELECTOR 1 3BIT MODE
seconds after the last activity of the 3-bit input. When
SELECTOR 1 STEP-UP
SELECTOR 1 ACK
).
. After two power cycles expire, the selector synchronizes to the position
SELECTOR 1 PWR ALARM
DESCRIPTION
Selector 1 changed its position to Z.
The selector position pre-selected via the stepping up control input has not been
confirmed before the time out.
The selector position pre-selected via the 3-bit control input has not been confirmed
before the time out.
D60 Line Distance Relay
is "Time-out", the pre-selected position is applied
SELECTOR 1 3BIT ACK
) and the 3-bit control inputs (
and
SELECTOR 1 3BIT ACK
5 SETTINGS
is "Acknowl-
SELECTOR 1 3BIT MODE
acknowledging input.
through
SELECTOR 1 3BIT A0 A2
SELECTOR BIT
SELECTOR
, accordingly).
).
SELECTOR 1 PWR ALARM
GE Multilin
) lock-