Effective 11/2003
Page 36
I.L. 66A7535H02
6.3 Battery Installation and Removal
The 3-volt lithium cell battery
(See Figure 6.1)
is easily
removed and replaced. The battery is located in the cavity
adjacent to the rating plug mounting screw, but is not part
of the rating plug. Insert a small screwdriver at the left side
of the rating plug, and to the left of the word OPEN, to
open the rating plug 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.
USE TYPE
1 / 3 N LITHIUM
BATTERY ONLY
Insulating Tab
+
-
Figure 6.1 Digitrip Battery
NOTE:
The battery can be replaced at any time, even
while the circuit breaker is in-service, without affecting the
operation of the circuit breaker or its protection functions.
CAUTION
EXERCISE CARE WHEN REPLACING THE BATTERY TO
ENSURE THAT THE CORRECT POLARITIES ARE
OBSERVED. POLARITY MARKINGS ARE SHOWN ON
THE RATING PLUG WHEN THE HINGED COVER IS
OPEN. ACCIDENTALLY INSTALLING THE BATTERY IN
THE REVERSE DIRECTION WILL NOT HARM EITHER
THE TRIP UNIT OR THE BATTERY, BUT WILL DEFEAT
THE FUNCTION OF THE BATTERY.
The replacement battery should be the same type as that
already in the trip unit or an equivalent. Acceptable 3.0 volt
lithium batteries may be obtained from the following
companies:
Company
Model
VARTA Batteries, Inc.
CR 1/3N
300 Elmsford Boulevard
Elmsford, N.Y. 10523 USA
1-914-592-2500
(www.varta.com)
Duracell, Inc.
DL 1/3N
Berkshire Corporate Park
Bethel, CT 06801 USA
1-800-551-2355
(www.duracell.com)
Sanyo Energy Corporation
CR 1/3N
2055 Sanyo Avenue
San Ysidro, CA 92173 USA
1-619-661-6620
(www.sanyo.com)
7.0 FRAME RATINGS (SENSOR RATINGS AND RATING
PLUGS)
The frame rating
of a circuit breaker is the maximum RMS
current it can continuously carry. The maximum short-
circuit current rating of the circuit breaker is usually related
to the frame rating as well.
A current value, (
I
n), that is less than the full frame rating
may be chosen to be the basis for the coordination of the
protection function of the breaker without affecting its
short-circuit current capability. For Digitrip 1150V units,
this is implemented by changing the CH Type-V current
sensors
and the corresponding
rating plug. These sensors
and rating plugs are available in kit form.
The CH Type-V current sensor rating is the maximum
current the circuit breaker can carry with the specified
sensors installed. Their rating can be the same or less
than the frame rating, but not greater.
This value, (
I
n), is the basis for the trip unit current set-
tings:
1. The Instantaneous Current Settings are multiples of
(
I
n)
(See Sections 4.6).
2. The Ground Current Settings
are multiples of (
I
n)
(See
Section 4.7)
. The one exception would be if the Zero
Sequence sensor is employed. There are two styles of
sensors - one with a 50A rating and a second with
100A and 200A setting selections.
3. The Long Delay Current Setting, (
I
r), is a fractional
multiple of (
I
n): Long Pickup Current Setting = (
I
r) =
LD x (
I
n)
(See Section 4.2.1.2).
4. The Short PU Setting is a multiple of (
I
r):
Short PU Setting = SD x (
I
r) = SD x [LD x (
I
n)]
(See Section 4.2.1.4).
