AT&T Bell System 197A Description And Operation

BELL SYSTEM PRACTICES
AT&TCo Standard
SECTION 100-101-401
Issue 1, November 1982
197 A BATTERY LOAD TEST SET
DESCRIPTION AND OPERATION
1. GENERAL
2. DESCRIPTION
3. DISPLAYS
4.
CONNECTIONS
5. OPERATION .
CONTENTS PAGE
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4
s
6.
TROUBLE LOCATING AND ADJUSTMENTS
6
Figures
1.
2.
3.
197A Battery load Test Set
197A Battery load Test Set Front Panel
197 A Battery load Test Set Connector Head
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1. GENERAL
1.01
This section describes the 197A battery load
test set and its operation. The 197A battery
load test set is used to test KS-21906, L4, batteries
which provide battery backup power for the SLC*-96
Subscriber Loop Carrier System. Four battery packs
of the KS-21906, L4, batteries rated 12 volts, 25 am-
pere-hour (AMP HR) may be tested at one time. The
test will identify the battery pack or packs that are
defective and should be replaced.
1.02
Whenever this section is reissued, the reason
for reissue will be given in this paragraph.
1.03
The 197A battery load test set provides a
check for the KS-21906, L4, batteries by per-
forming a high-rate discharge test at a constant 18
AMP current for a period of 15 minutes. The battery
terminal voltage is monitored constantly during dis-
*
Trademark.
charge. The tested battery pack or packs are consid-
ered to be GOOD if the monitored terminal voltage
remains above a preset value for the entire 15 minute
test period.
1.04
Only one-third of the battery capacity is ex-
hausted during tests. Therefore, the battery
pack can support a significant ac power outage occur-
ring during or immediately following the test. A 3A
battery charger restores the battery pack to full ca-
pacity at the test completion by high rate charging.
1.05
The 197A battery load test set requires no in-
ternal power supply or external power cord.
The power necessary to operate the test set is ob-
tained from the batteries under test. This eliminates
the possibility of finding the battery load test set
with either dead batteries or the necessity for
commerical ac power for operation.
Note 1: All batteries to be tested must be
fully charged to avoid false indications on the
battery status liquid crystal displays (LCDs).
Note 2: The battery test should be stopped
only if all battery status LCDs, for all batteries
under test, display REPLACE. The failed bat-
teries should be discarded after the test.
2. DESCRIPTION
2.01
The 197 A battery load test set consists of a
faceplate with switches and LCDs, main
printed wiring board, heat sink assembly, and fused
test cord with fused test jacks assembled to a com-
mon chassis. The chassis is mounted in a blue carry-
ing case that measures 16 inches wide, 12 inches deep,
and 10 inches high. The 197 A battery load test set
weighs approximately 25 pounds. (See Fig. 1.) The
front cover of the case is removable when in use to
minimize the space required for operation. The case
of the test set is vented at the front panel for heat dis-
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A. Page 1