# Logic Diagrams; Invalid Password Entry - GE L90 Instruction Manual

Line current differential system.

CHAPTER 4: INTERFACES
8.
When
CHANGE SETTING
CHANGE SETTING
9.
When the

By default, when an incorrect Command or Setting password has been entered via the faceplate interface three times
within five minutes, the
command level access via the faceplate interface for five minutes.
By default, when an incorrect Command or Setting password has been entered via any external communications interface
three times within five minutes, the
settings or command access via the any external communications interface for five minutes. The
FlexLogic operand is set to "Off" after five minutes for a Command password or 30 minutes for a Settings password.
These default settings can be changed in EnerVista under Settings > Product Setup > Security.

## 4.3 Logic diagrams

Logic diagrams in this instruction manual provide an overview of function and settings. A logic diagram is based on
Inputs-on the left side, which are setting and operands
Logical gates, which is Boolean algebra to combine logical lines using AND, OR, NOT, and other gates to get a new
logical state
Logical operators, which are timers, one-shot operations, latches, and so on
Outputs-on the right side, which are products of the manipulations with inputs, logical gates, and logical operators to
produce new operands and define the output state of the element
True and false values are denoted by 1 and 0 respectively. A function usually is high/on/enabled when 1.
Reading from right to left in the following diagram, the
are triggered when either the settings or reset latch in the middle of the diagram is triggered. When this applies, the
operand is triggered after the delay set by the
BUS 1 OP
operand initiates immediately. The settings or reset latch in the middle of the diagram is triggered as follows.
TRIP BUS 1 PKP
For the reset, one of three conditions are required to meet the OR requirement shown at the bottom left. That is, the
setting must be 0=Disabled (which is negated by the NOT function to become 1=Enabled), output
TRIP BUS 1 LATCHING
from the
TRIP BUS 1 RESET
For the settings, one of 16 input conditions at the top left must be met for the OR, the
Enabled, and the
TRIP BUS 1 BLOCK
Table 4-2: Logic diagram symbols
Symbol
Description
= Off
Output from FlexLogic operand, so user-defined
= Enabled
1 = Enabled and 0 = Disabled
OR
Any function input on the left side satisfies the condition
AND
All functions input on the left side are required to satisfy the condition
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
displays, re-type the password and press
ENTER NEW
FlexLogic operand is set to "On" and the L90 does not allow settings or
FlexLogic operand is set to
TRIP BUS 1 OP
TRIP BUS 1 PICKUP DELAY
FlexLogic operand must be 1, or output from the
output must output as 0, which is then negated/reversed by NOT to become 1.
.
ENTER
VERIFY NEW
HAS BEEN STORED
On
and the L90 does not allow
"
"
and
FlexLogic operands on the right side
TRIP BUS 1 PKP
or
TRIP BUS 1 RESET DELAY
FlexLogic operand must be 1.
RESET OP
TRIP BUS 1 FUNCTION
LOGIC DIAGRAMS
TRIP
setting, while the
must be
4-31
4