Non-Volatile Latches - GE MI-869 Instruction Manual

FLEXLOGIC

Non-volatile Latches

4–358
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)
NV LATCH 1 FUNCTION
Range: Disabled, Enabled
Default: Disabled
The setpoint enables or disables the Non-volatile Latch function.
NV LATCH 1 TYPE
Range: Reset-Dominant, Set-Dominant
Default: Reset-Dominant
The setting characterizes NV LATCH 1 to be set- or reset-dominant.
NV LATCH 1 SET
Range: Any FlexLogic Operand
Default: Off
If asserted, this specified FlexLogic operand 'SET' NV LATCH 1.
LATCH 1 RESET
Range: Any FlexLogic Operand
Default: Off
If asserted, this specified FlexLogic operand 'RESET' NV LATCH 1.
LATCH 1 RESET LATCH 1 ON
Off On
Off Previous State
On Off
Off On
On
Off Previous State
On Off
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
LATCH 1 OFF
Off
Previous State
On
Off
Previous State
On