1.5 USING THE RELAY
The relay is defaulted to the "Not Programmed" state when it leaves the factory. This safeguards against the installation of
a relay whose settings have not been entered. When powered up successfully, the TROUBLE indicator will be on and the
IN SERVICE indicator off. The relay in the "Not Programmed" state will block signaling of any output relay. These condi-
tions will remain until the relay is explicitly put in the "Programmed" state.
Select the menu message
To put the relay in the "Programmed" state, press either of the
plate TROUBLE indicator will turn off and the IN SERVICE indicator will turn on. The settings for the relay can be pro-
grammed manually (refer to the SETTINGS chapter) via the faceplate keypad or remotely (refer to the URPC Help file) via
the URPC software interface.
The battery tab is installed in the power supply module before the L90 shipped from the factory. The battery tab prolongs
battery life in the event the relay is powered down for long periods of time before installation. The battery is responsible for
backing up event records, oscillography, data logger, and real-time clock information when the relay is powered off. The
battery failure self-test error generated by the relay is a minor and should not affect the relay functionality. When the relay is
installed and ready for commissioning, the tab should be removed. The battery tab should be re-inserted if the relay is pow-
ered off for an extended period of time. If required, contact the factory for a replacement battery or battery tab.
It is recommended that passwords be set up for each security level and assigned to specific personnel. There are two user
password SECURITY access levels:
The COMMAND access level restricts the user from making any settings changes, but allows the user to perform the fol-
operate breakers via faceplate keypad
change state of virtual inputs
clear event records
clear oscillography records
The SETTING access level allows the user to make any changes to any of the setting values.
Refer to the CHANGING SETTINGS section (in the HUMAN INTERFACES chapter) for complete instructions
on setting up security level passwords.
FlexLogic™ equation editing is required for setting up user-defined logic for customizing the relay operations. See section
FLEXLOGIC™ in the SETTINGS chapter.
Templated tables for charting all the required settings before entering them via the keypad are available in the COMMIS-
SIONING chapter, which also includes instructions for commissioning tests.
L90 Line Differential Relay
keys once and then press
1.5.7 FLEXLOGIC™ CUSTOMIZATION
1 GETTING STARTED
1.5.4 RELAY ACTIVATION
. The face-
1.5.5 BATTERY TAB
1.5.6 RELAY PASSWORDS
GE Power Management