Force Contact Inputs - GE L90 Instruction Manual

L90 line current differential system ur series
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5 SETTINGS
Table 5–26: TEST MODE OPERATION
TEST MODE
TEST MODE
FUNCTION
FORCING
OPERAND
Disabled
No effect
Isolated
No effect
Forcible
On (logic 1)
Off (logic 0)
The
setting can only be changed by a direct user command. Following a restart, power up, settings
TEST MODE FUNCTION
upload, or firmware upgrade, the test mode will remain at the last programmed value. This allows a L90 that has been
placed in isolated mode to remain isolated during testing and maintenance activities. On restart, the
setting and the force contact input and force contact output settings all revert to their default states.
PATH: SETTINGS
TESTING
FORCE CONTACT
INPUTS
MESSAGE
MESSAGE
The relay digital inputs (contact inputs) could be pre-programmed to respond to the test mode in the following ways:
If set to "Disabled", the input remains fully operational. It is controlled by the voltage across its input terminals and can
be turned on and off by external circuitry. This value should be selected if a given input must be operational during the
test. This includes, for example, an input initiating the test, or being a part of a user pre-programmed test sequence.
If set to "Open", the input is forced to report as opened (Logic 0) for the entire duration of the test mode regardless of
the voltage across the input terminals.
If set to "Closed", the input is forced to report as closed (Logic 1) for the entire duration of the test mode regardless of
the voltage across the input terminals.
The force contact inputs feature provides a method of performing checks on the function of all contact inputs. Once
enabled, the relay is placed into test mode, allowing this feature to override the normal function of contact inputs. The Test
Mode LED will be on, indicating that the relay is in test mode. The state of each contact input may be programmed as "Dis-
abled", "Open", or "Closed". All contact input operations return to normal when all settings for this feature are disabled.
GE Multilin
IN-SERVICE
TEST MODE
LED
LED
Unaffected
Off
Off
On
Off
Flashing
Off
Flashing

FORCE CONTACT INPUTS

FORCE Cont Ip 1
:Disabled
FORCE Cont Ip 2
:Disabled
FORCE Cont Ip xx
:Disabled
L90 Line Current Differential System
CRITICAL
INPUT AND OUTPUT BEHAVIOR
FAIL
RELAY
Unaffected
Contact outputs and inputs are under normal
operation. Channel tests and PMU tests not
operational (where applicable).
De-
Contact outputs are disabled and contact inputs
energized
are operational. Channel tests and PMU tests
are also operational (where applicable).
De-
Contact inputs and outputs are controlled by the
energized
force contact input and force contact output
functions. Channel tests and PMU tests are
operational (where applicable).
De-
Contact outputs and inputs are under normal
energized
operation. Channel tests and PMU tests are also
operational (where applicable).
5.10.2 FORCE CONTACT INPUTS
Range: Disabled, Open, Closed
Range: Disabled, Open, Closed
Range: Disabled, Open, Closed
5.10 TESTING
TEST MODE FORCING
5
5-281

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