GE L90 User Manual

CHAPTER 5: SETTINGS FLEXLOGIC
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-215
5
The non-volatile latches provide a permanent logical flag that is stored safely and do not reset upon restart after the relay
is powered down. Typical applications include sustaining operator commands or permanently blocking relay functions,
such as Autorecloser, until a deliberate interface action resets the latch.
LATCH 1 TYPE — This setting characterizes Latch 1 to be Set- or Reset-dominant.
LATCH 1 SET — If asserted, the specified FlexLogic operands 'sets' Latch 1.
LATCH 1 RESET — If asserted, the specified FlexLogic operand 'resets' Latch 1.
Figure 5-108: Non-volatile latch operation table (N = 1 to 16) and logic

LATCH 1 TYPE:
Reset Dominant
Range: Reset Dominant, Set Dominant

LATCH 1 SET:
Off
Range: FlexLogic operand

LATCH 1 RESET:
Off
Range: FlexLogic operand

LATCH 1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled

LATCH 1
EVENTS: Disabled
Range: Disabled, Enabled
Latch n type Latch n
set
Latch n
reset
Latch n
on
Latch n
off
Reset
Dominant
ON OFF ON OFF
OFF OFF Previous
State
Previous
State
ON ON OFF ON
OFF ON OFF ON
Set
Dominant
ON OFF ON OFF
ON ON ON OFF
OFF OFF Previous
State
Previous
State
OFF ON OFF ON

GE L90 Specifications

General

Communication	Ethernet, Serial
Mounting	Panel Mount
Frequency	50/60 Hz
Inputs	Digital, Analog
Outputs	Relay
Control	Local, Remote
Communication Interface	IEC 61850, DNP3, Modbus
Protection Functions	Differential, Ground Fault
Standards Compliance	IEC, IEEE