1 0
Trip
Unit
Plug
Plug
for
120
Vac
Receptacle
Fig. 7
Auxiliary Power Module
6. Reset and reclose the circuit breaker fol lowi ng establ ished
operati ng procedures.
6.0 Back-up Battery
6.1 General
As indicated in Figs. 3 and 6, a back-up battery is provided to
mai nta i n the mode of trip LED indication i n the Digitri p RMS
500 Trip U nit. The back-up battery is located i n the rating plug
along with a battery check pushbutton and a g reen battery
check LED.
6.2 Battery Check
The battery is a long l ife, lith i u m photo type unit. The ready
status of the battery can be checked at any time by depressing
the battery check pushbutton and observing the "On" condi
tion of the battery check LED as shown in Fig. 6. 1 . If the battery
check LED does not tu rn "ON", replace the battery.
6.3 Battery Replacement
Should the battery require replacement, it can be easily replaced
from the front of the trip u nit by l owering the hinged cover of
the rating plug as shown in Fig. 6.2. The battery can then be
removed by p u l l i ng the battery tab as shown in Fig. 6.3.
Note:
The battery can be replaced at any time with
the circu it breaker in service without affecting the
operation of the circu it breaker and its protection
fu nction.
The replacement battery shou l d be the same type or equ iva
lent. Acceptable 3.0 volt lith i u m batteries may be obtai ned from
the following companies under their type designation indicated :
Company
Model
Varta Batteries, Inc.
1 50 Clarbrook Road
Elmsford, N .Y. 1 0523
Du racell
South B roadway
Tangtown, N .Y. 1 059 1
{914) 591-7000
U n ion Carbide Corp.
Battery Products Div.
Eveready
39 Old Ridgebury Road
Danbury, CT 0681 7-0001
{203) 794-7548
CR 1 /3N
DL 1 13 N
2L-76BP
CAUTION
CARE SHOULD BE EXERCISED WHEN REPLACI N G A
BATTERY TO I NSURE THAT THE CORRECT POLAR
ITIES ARE OBSERVED. POLARITY MARKI NGS ARE
SHOWN ON THE RATI N G PLUG WHEN THE H I N G E D
COVER IS O P E N A S I N DI CATED I N FIGS. 6.2 AND 6.3.
7.0 Auxiliary Power Module
The Aux i l iary Power Module {Cat. No. PRTAAPM), i l l u strated
in Fig. 7, is an encapsu lated power supply that requ i res a 1 20
Vac i nput at either 50 or 60 Hz. It provides an output of 32 Vdc
{nominal 40 Vdc open circuit) which can be used for testing a
Digitrip R M S 500 Trip Un it.
When d rawout construction is provided, any circuit breaker
equipped with a Digitrip RMS 500 Trip U n it can be conveniently
set and tested while the circu it breaker is out of its cel l or i n
its cell i n the " Disconnect" o r "Withdrawn" positions using
the Aux i l i a ry Power Module.
The Aux i l iary Power Mod u le is equipped with a unique plug
i n con nector suitable only for plugging i nto the keyed recep
tacle of a Digitrip RMS Trip U n it. This prohi bits the possible
use of an incorrect, but simi lar, type power module. The loca
tion of the keyed receptacle for the auxiliary power module is
shown in Fig. 1 .
8.0 Rating Plug
The rating plugs, as i l l u strated in Figs. 1 and 6, a re used to
esta blish the contin uous ampere rating of the related circuit
breaker. All pick-up settings of the protection functions of the
trip unit, i .e., long delay, short delay, i n stantaneous and g round
fau lt are selected as a m u ltiple of the rating plug rating !ln l·
Different types and ratings a re ava i lable to match the desi red
ampere rating and type of circuit breaker i nto which the trip
u nit is to be installed. Also, since the rati ng plugs are frequency
sensitive, specific types a re avai lable for 50 or 60 Hz system
appl ications.
Complete catalog descriptions of all available rating plugs a re
given i n the applicable circuit breaker supplementary i n struc
tion leaflets. References to these documents a re given i n Sec
tions 9.1 and 9.2.
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