®
APS Shelf Po wer/Alarm Card
TRANSPORT
This procedure describes the steps that should be followed to properly install a replacement Power and Alarm card in
an APC chassis when all card slots are occupied
TxPORT APS chassis (viewed from front of chassis). The installer should read and understand all of the installation
procedures shown in the following paragraphs before proceeding.
1. Before attempting to replace the Power and Alarm card, the installer sho uld v er ify that he has the following materials and equipment on hand. After verifying that all materials are present, proceed to Step 2.
• Voltmeter
• Wiring tie wraps
• Spare 23 A fuse position and a 3 A, Type 70 fuse
• Replacement Power and Alarm card (Re vision 2.63 or hig her). The re vision is pr inted at the top of the front panel
CLEI bar code
• TxPORT power/jumper cable (ten foot black and white jumper cable with slide-on connectors)
2. Verify that the front panel of the installed Power and Alarm card does not indicate any blown fuses (A or B) and
that all cards in the shelf appear normal.
3. Attach the provided TxPORT power /jumper cable to the rear wiring pins of the 1050 APC equipment shelf and to
the selected 23 A fuse -48 VDC position. This wiring connection will p rovide a temporary -48 VD C power arrangement to the APC shelf while the Power and Alarm card replacement is performed.
. The Power and Alarm card is located at the extreme left side of the
Replacement Guide
Part Number 45-00093 Revision 1.0
Caution: The installer must proceed with caution and pay careful attention to all connections and wiring polarity while implementing the temporary -48 VDC wiring connections from the rear pa nel of the
APC shelf to the spare 23 A fuse position. Failure to proceed with care could result in a loss of power
to the APC shelf.
To install the temporary -48 VDC wiring connection from the APC shelf to the 23 A central office fuse, perform the
following:
1) Remove the fuse from the temporary 23 A fuse position.
2) Connect the black lead of the power/jumper cable to the -48 VDC position of the temporary 23 A fuse.
3) Connect the white lead of the power/jumper cable to the -48 return position of the temporary 23 A fuse.
4) Connect a voltmeter (configured for reading DC volts) to the slide-on connector end of the cable as follows:
Common
Positive
5) After connecting the voltmeter, insert a fuse in the temporary 23 A position. The voltmeter should indicate -48
VDC. If the meter indicates + 48 VDC, the wiring at the 23 A block is reversed and the installer should correct
and confirm that the voltage reading is -48 VDC.
Caution: Do not proceed until the correct polarity is present at the power/jumper cable.
6) Once -48 VDC is present at the end of the power/jumper cable, remove
block.
(–) probe connected to the white lead of the slide-on connector end of the power/jumper cable
(+) probe connected to the black lead of the slide-on connector of the power/jumper cable
the fuse from the temporary 23 A fuse
7) Next, locate C15 at the rear of the 1050 APC chassis (see Figure 1).
8) Locate the bottom right pin of C15 as viewed from the chassis rear. This is pin 35, -48 VDC.
9) Carefully slide the BLACK lead slide-on connector onto wire wrap pin 35 of C15 (see Figure 1). If the connection feels loose, remove and gently compress the connector end slightly using a pair of flats. Once the slide-on
connector is attached and the installer is confident that the connection is firm, proceed to the next step.
Caution: Take care not to short any wiring connections while making the power/jumper cable attachment.
10) Next, carefully slide the WHITE
nection feels loose, remove and gently compress the connector end slightly using a pair of flats. Once the slideon connector is attached and the installer is confident that the connection is firm, proceed to the next step.
11) After both the black and white leads are attached, physically secure the power/jumper cable wiring using one or
more tie wraps. This will insure that the leads are not torn loose.
12) Verify that the front panel of the Power and Alarm card does not indicate any blown fuses (A or B) and that all
cards in the shelf appear normal.
13) Insert a 3 A, Type 70 fuse in the temporary 23 A fuse position.
14) After powering the 23 A temporary fuse position, verify that the front panel of the Power and Alarm card does
not indicate any blown fuses (A or B) and that all cards in the shelf appear normal.
15) Before swapping out the old Power and Alarm card with a replacement, set the chassis address switches on the
replacement card so that they match the address DIP values set on the old card (see Figure 2, Item #1).
Caution: Failure to properly set the chassis address of the Power and Alarm card will pr ev ent the APS
manager from communicating with this shelf.
16) After the chassis address DIP switches have been properly set, verify that the 3 A fuses in the replacement card
(Fuse A and Fuse B) are in place and not blown (fuse type is GMT, 3 A)
17) The installer is now ready to remove the old Power and Alarm card and replace it with the new card. To remove
the old card, unscrew the top and bottom retaining screws and remove. After the card is removed, simply insert
the new card into the card guides and firmly push the card in until it is seated into the backplane connector. Then
secure the card in place using the two retaining screws.
lead slide-on connector onto wire wrap pin 33 of C15 (se e Figu re 1). If the con -
18) After replacing the card, verify that the Power and Alarm card has no fuse alarm indications and that the other
cards in the chassis appear to be operating normally.
19) After installing the replacement Power and Alarm card and verifying that it is operating properly, remove the
fuse from the temporary 23 A fuse position.
20) After removing the fuse, carefully remove (one at a time) the BLACK and WHITE slide-on connectors from pin
35 and pin 33.
21) Remove the power/jumper leads from the 23 A temporary fuse block.
22) The card replacement is now complete.
The TxPORT power/ jumper cable and the old Power and Alarm card should be returned as soon as possible for
rework. This material will then be reused. Make sure that the power/jumper cable and the old Power and Alarm card
is placed back in the original container and return to:
AT&T Central Stock Plug-In Warehouse
Eastpoint, Georgia
Figure 2 Power and Alarm Card Functions
1250 Front View
ALARM &
POWER
123
1234
O
N
–
CHASSIS
ADDRESS
1 2 3 4 5 6 7 7
POWER
NORMAL
SILENT
ACO
1250 Controls and Indicators
Index Indicator Description
1 CHASSIS ADDRESS DIP switch which provides up to 8 chassis addresses
(refer to the instructions below).
2 POWER Indicates that power is being supplied to the unit.
3 NORMAL/SILENT Normal enables the ACO (Alarm Cut Off).
Silent disables the ACO.
4 ACO The Alarm Cut Off LED indicates that the alarm
relay contacts are disabled.
5 ALARM This LED indicates that an APS shelf alarm has
occurred.
6 FUSE ALARM This LED indicates that a bus fuse has blown.
7 3 AMP GMT Two 3 Amp fuse for power source A/B.
ALARM
®
A
FUSE
ALARM
3 AMP
B
TRANSPORT
GMT
1250
NOTES: 1250 cards that are Rev. 2.63 or
higher add the capability to maintain alarm
card functions (front panel indicators, switch
functions, and relay operation) even when
Fuse A and B are open. This is possible
because these cards have the alarm circuitry
wired to the ‘hot’ side of the incoming A and
B external power source(s). In early revisions, the 1250 alarm functions were only
operational if one or mo re of the front pan el
fuses were functional (not blown).
Earlier versions of the 1250 card were called
1555P cards. The primary functions of both
cards are the same.
Chassis Address Selection
Each APS chassis must be assigned a block of addresses for its 1557 APS
cards so that the 1559 APS Manager may communicate with them. The DIP
switch located on the front panel of the 1250 Alarm and Power Card is used to
provide up to 8 chassis addresses. These addresses are used by the APSM to
poll and send commands to the 1557 cards.
Three out of the four switches (S2, S3, and S4) are set to one of the 8 possible
address codes as shown in the table to the right. The DIP switch positions are
number S1 through S4, with S1 on top and S4 on bottom. Note that S1 is not
used and must remain open to 0, which is the left switch position.
The first unit address (1557 card) in the chassis is the base address plus 1. For
example, if S2, S3, and S4 were all set to 0, the first unit address in the chassis
would be ‘1’ (0 + 1).
1557 Chassis Addresses
Chassis
Number
10 to 27000
2 32 to 59 0 0 1
3 64 to 91 0 1 0
4 96 to 123 0 1 1
5128 to 155100
6160 to 187101
7192 to 219110
8224 to 251111
Base
Address
S2 S3 S4
Figure 1 1050 Chassis Rear View
J1
J5
J2
C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1
J3
REMOTE ALARMS/CONTROL
TB1
J6
J7
J8
21
35
36
C15
Notes for wiring connections to atta ch external -48 VDC and Return to APC shelf.
1. Attach slide-on conn ector (black lead) to
wire wrap pin 35 of connector C15. Attach
other end to -48VDC lead of 23 A fuse.
2. Attach slide-on connector (white lead) to
wire wrap pin 33 of connector C15. Attach
other end to -48 Return lead of 23 A fuse.
3. Make sure fuse rating of 23 A fuse is 3
amps, slow blow.
4. After making connection s fuse 23 A position with 3 amp slow blow fuse.
21
Pin 33, White Jumper
-48 Return
36
35
Pin 35, Black Jumper
-48 VDC
C15
Spare
23 A fuse
J4
TxPORT Customer Service
127 Jetplex Circle
Madison, Alabama 35758
Customer Service
800-926-0085, ext. 227
Product Technical Support
(8 a.m. to 5 p.m. Central Time)
800-285-2755 or
205-772-3770
Emergency After Hours
800-285-2755
E-Mail (Internet Address):
support@txport.com
J9
Pin C15 Function
1 -48 VDC - Primary
5 48 VRTN
9 -48 VDC - Secondary
18 Alarm NC
19 Alarm NO
20 Alarm Common
29 NMS In
30 NMS Out
34 NMS Ground
31 -48V DC, Secondary Bus
33 -48 Return, Return
35 -48V DC, Primary Bus
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