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CHAPTER 4: SETPOINTS
Non-volatile Latches
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
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.
LATCH 1 RESET
LATCH 1 ON
Off
On
Off
Previous State
On
Off
Off
On
On
Off
Previous State
On
Off
FLEXLOGIC
LATCH 1 OFF
Off
Previous State
On
Off
Previous State
On
4–383
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