Non-Volatile Latches - GE 845 Instruction Manual

FLEXLOGIC

Non-volatile Latches

4–328
TIMER 1 DROPOUT DELAY
Range: 0 to 60000 s in steps of 1 s
Default: 0 s
The setpoint sets the time delay to Dropout. If a Dropout delay is not required, set this
function to "0".
The purpose of a Non-volatile Latch is to provide a permanent logical flag that is stored
safely and does not reset when the relay reboots after being powered down. Typical
applications include sustaining operator commands or permanently blocking relay
functions such as Autorecloser, until a deliberate HMI action resets the latch.
Operation of the element is summarized in the following table:
LATCH 1 TYPE LATCH 1 SET
Reset Dominant On
Off
On
Off
Set Dominant On
Off
Off
Path:
Settings > FlexLogic > Non-volatile Latches > Latch 1(16)
LATCH 1 RESET LATCH 1 ON
Off On
Off Previous State
On Off
Off On
On
Off Previous State
On Off
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
LATCH 1 OFF
Off
Previous State
On
Off
Previous State
On