GE Industrial Solutions EntelliGuard TU Trip Units - Manual (Page 68)

EntelliGuard TU Trip Units: UL/ANSI Models DEH-4567B
Battery Information
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SECTION 10. BATTERY INFORMATION
The trip unit has a front pane-mounted battery. When the
battery is present, the user scan view data on the LCD and
read or program the trip unit via the keypads. The battery
allows the user to display data, change set points and
provide thermal memory.
During normal operation the trip unit is powered either
from current flow in the circuit breaker’s internal current
transformers or from an external DC supply. When neither
of these sources is available it is still possible to review and
modify settings or view events in the EntelliGuard TU using
power from the internal battery. Pressing any keypad
button will bring up the LCD display allowing full navigation
of the trip unit’s menus. Note that only the LCD function is
powered by the battery – communications, digital I/O and
protection functions are not powered in this mode of
operation.
The trip unit will automatically shut off after 20 sec when
battery powered to maximize battery life.
Duracell CR2 is the replacement battery.
BATTERY FUNCTION
Pressing any key on the face of the trip unit powers the unit
from its internal battery. Battery power is maintained for 20
sec after the last key is pressed.
This self-powered mode allows setting up the trip unit or
viewing trip targets when the breaker is de-energized and
external control power is unavailable.
All normal setup, meter, and status functions can be
performed with battery power.