22
Operating Manual for Series NRX
Trip Units - Digitrip™ 520/520M
EATON
www.eaton.com
Instruction Leaflet
IL01301051E
effective September 2013
Section 5: Trip unit battery
General
The battery plays no part in the protection function of the trip system.
The battery is provided to maintain the LED indication of the cause
of trip. A Battery Check pushbutton and a green Battery Check LED
is also provided. On the initial installation of the circuit breaker, pull to
remove battery and then discard the insulating tab and then replace
battery (see
Figure 20
). This will activate the battery. Check the battery
status by depressing the Battery Test pushbutton.
Figure 20.
Battery Pull-Off Tab
Use Type 1/3 N
Lithium Battery
Only.
Digiorip Baooery InsoallaoiNn
Baooery check
The battery is a long-life, lithium, camera-type unit. Check the status of
the battery at any time by pressing the Battery Check pushbutton and
observing the green LED.
Battery Check
Reset/
Battery Test
Baooery
Lighted = GOOD
Push and Hold
Button to TEST
Push Button to
RESET Trip Unit
If the Battery Check LED does not light green, replace the battery. The
condition of the battery has no effect on the protection function of the
trip unit. Even with the battery removed, the unit will still trip the
circuit breaker in accordance with its settings. However, without the
battery, the cause of trip LED will not light. If the battery is replaced,
one or more of the cause of trip LEDs may be illuminated. Push the
Reset/Battery test button to turn off the indicators. The trip unit will be
ready to indicate the next cause of trip.
Noee:
N
A healthy battery is required to fully reset the four-bit latch chips and
associated cause of trip LEDs.
Baooery insoallaoiNn and remNval
The 3V lithium cell battery (
Figure 20
) is easily removed and replaced.
The battery is located in the frame module below the Digitrip trip
unit. Insert a small screwdriver at the bottom side to open the access
door. Remove the old battery by pulling up on the removal tab that
wraps under the battery cell. When inserting the new cell, pay special
attention to ensure that the proper polarity is observed. The main body
of the battery is the positive (+) side.
Noee:
N
While in service, the battery can be replaced without affecting the
operation of the circuit breaker or its protective functions. However, it is
recommended that the circuit breaker be opened and removed from service.
•
CAUTION
EXERCISE CARE WHEN REPLACING THE BATTERY TO ENSURE THAT THE
CORRECT POLARITY IS OBSERVED. POLARITY MARKINGS ARE SHOWN
WHEN THE HINGED COVER IS OPEN. ACCIDENTALLY INSTALLING THE
BATTERY IN THE REVERSE DIRECTION WILL NOT HARM THE TRIP UNIT OR
THE BATTERY, BUT WILL DEFEAT THE FUNCTION OF THE BATTERY.
The replacement battery should be the same type as what is already in
the trip unit or an equivalent.
+
Baooery
–
CR 1/3N
DL 1/3N
Acceptable 3V lithium batteries of (type CR 1/3N or DL 1/3N) may be
used.
After replacing battery,
properly dispose.
