GE C30 Instruction Manual page 254

CONTROL ELEMENTS
SELECTOR 1 3BIT A0
pre-selects the position using the following encoding convention:
A2 A1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
The "rest" position (0, 0, 0) does not generate an action and is intended for situations when the device generating the three-
bit control word is having a problem. When
SELECTOR 1 TIME-OUT
the pre-selected position is applied on the rising edge of the
The stepping up control input (
mutually: once the stepping up sequence is initiated, the three-bit control input is inactive; once the three-bit control
sequence is initiated, the stepping up input is inactive.
SELECTOR 1 3BIT MODE
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 position only
after confirmation via a separate acknowledging signal. If the acknowledging signal does not appear within a pre-defined
5
period of time, the selector rejects the change and an alarm established by invoking the
for three seconds.
SELECTOR 1 3BIT ACK
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 three-bit control inputs. Note that the stepping up control input and three-bit
OUT
control input have independent acknowledging signals (
SELECTOR 1 POWER-UP MODE
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," the selector switch acts as follows. For two power cycles, the selector applies position 0 to the
switch and activates
dictated by the three-bit control input. This operation does not wait for time-out or the acknowledging input. When the
synchronization attempt is unsuccessful (that is, the three-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 attempts 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
Event name
SELECTOR 1 POS Z
SELECTOR 1 STP ALARM
SELECTOR 1 BIT ALARM
5-136
, , and — These settings specify a three-bit control input of the selector. The three-bit control word
A1 A2
A0 Position
0 rest
1 1
0 2
1 3
0 4
1 5
0 6
1 7
SELECTOR 1 3BIT MODE
seconds after the last activity of the three-bit input. When
SELECTOR 1 STEP-UP
— This setting defines the selector mode of operation. When set to "Time-out," the selector changes
— This setting specifies an acknowledging input for the three-bit control input. The pre-selected
— This setting specifies the element behavior on power up of the relay.
).
. After two power cycles expire, the selector synchronizes to the position
SELECTOR 1 PWR ALARM
— If enabled, the following events are logged:
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 three-bit control input has not been confirmed before the time
out
is "Time-out," the pre-selected position is applied in
SELECTOR 1 3BIT ACK
) and the three-bit control inputs (
and
SELECTOR 1 ACK SELECTOR 1 3BIT ACK
C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
is "Acknowledge,"
SELECTOR 1 3BIT MODE
acknowledging input.
through
SELECTOR 1 3BIT A0
FlexLogic operand
SELECTOR BIT ALARM
SELECTOR TIME-
, accordingly).
SELECTOR 1 PWR ALARM
) lock-out
A2
).