TRANSPORT
®
1251 Power Maintenance Card
Configuration Guide
Part Number 45 -00062
Rev 1. 00
-48
RTN
GND
CARD
MAINT
POWER
1 2 3 4 55
1 -48 Volts: This terminal screw connects to a -48 Volt DC power source.
2 Return: This terminal screw connects to the power source return.
3 Ground: This terminal screw connects the card to the chassis ground.
4 Power: This green LED indicator is ON when -48 VDC power is being supplied to the unit.
5 3 Amp GMT Fuse: These two fuses (F1 and F2) protect the 1251 card from input power shorts.
General
The 1251 Power Maintenance Card is designed to provide temporary
power to a 1555 APC chassis during shelf maintenance periods which
involve the removal or replacement of the Power and Alarm card.
Caution: The 1251 car d is not mechanically or electrically compatible with the Power and Alarm card slot. Do not insert this card
into Slot 1.
The 1251 front panel conta ins a scre w terminal st rip with 3 connecto rs,
two GMT type power fuses, a power LED indicator, and two card -
retaining thumb screws.
Design Features
• The card may be installed in any vacant 1557 APC card slot.
• The card is compatible with any 1555 APC chassis.
• The card provides fused input protection and a power indicator.
Operation
Refer to the front pa nel diagra m abov e and to the simp lified c ircuit diagram below for the following operational features.
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PWR
An external -48 VDC fused source is fed into the card from the front
panel screw terminal stri p. This power is then f ed throug h fro nt pane l
card fuses F1 and F2 (GMT type, 3 Amps). The power is then fed to
both the A and B power bus pins of the c ard co nn ecto r. Both A and B
feeds are diode protected from power reversals.
The front panel power indicator is diode bia sed to allo w the LED to be
on only when the proper polarity of -VDC is wired to the front panel
terminal connections.
GMT
3 Amp
1251
Specifications
Mechanical
Dimensions: 10.5" H, 1" W, and 11" D
Weight: approximately 10 ounces
Environmental
Operating Temp: 0° to 50° C(32° to 122°F)
Storage Temp: -20° to 85° C(-4° to 185°F)
Humidity: 95% max (non-condensing)
Part Number
F-1251-001--11
Simplified Circuit Diagram
Power
Terminal
-48 VDC
Return
Ground
Fuse F1
Fuse F2
Power/Polarity
ON Indicator
Power
Diode
Isolation
Card
Connector
-48 VDC (A)
Return (A)
-48 VDC (B)
Return (B)
Chassis Ground
1251 Card Installation
The following p roced ures sho uld be follo we d to in sure pr oper insta llation of the 1251 card.
Do not remove the Power and Alarm card until all the following
steps are completed. Premature removal of this card will result in
a service outage of all APC cards. Do not start this procedure
without a spare APC power and alarm card on site.
1) Remove the 1251 card from the shipping container and insp ect
for any physical damage which may have occurred during shipping. If
damage is visible, do not attempt to install this card. Follow the normal internal maintenance procedures for returning the card and
obtaining a replacement.
2) Insert the 1251 card int o any vacant APC slot. Ensure that the
card is fully seated and secure the card into t he chassis by hand tightening the two front panel t humb screws.
3) Remove the front panel fuses (F1 and F2) from the 1251 card.
is corrected, -48 VDC will be present at the 1251 front pane l t ermin a l.
Insert fuses F1 and F2 and verify that the ‘PWR’ indicator is ON. If so,
proceed to step 9.
c) If -48 VDC is present, but the ‘PWR’ indi cator is OFF, reverse
the ‘- 48’ and ‘RTN’ power lead connections to the card. Then insert
fuse F1 and verify that the LED is ON.
Caution: Do not perform the Power and Alarm card replacement
steps until the green ‘PWR’ indicator is ON.
9) Visually verify that the 1251 card is firmly seated into the card
slot, that the front panel card retaining screws are tightened securely,
and that the ‘PWR’ indicator is ON.
The installation of the 1251 card is now complete.
4) Connect a wire (26 gauge or larger) from the ‘Ground’ screw
terminal to a frame ground.
5) Connect a wire (26 gauge or larger) from the ‘- 4 8’ screw terminal to the respective -48 VDC lead of the external office supply.
6) Connect a wire (26 gauge or larger) from the ‘Return’ screw terminal to the respective return lead of the external office supply.
7) Insert fuses F1 and F2 back into t he 1251 card.
8) Observe the green ‘PWR’ indicator, which should be ON after
the fuses are inserted. If so, proceed to step 9. If the LED is OFF, perform the following checks:
a) Remove fuses F1 and F2. Using a DC voltmeter, verify the
presence of - 48 VDC by placing the positive probe on the ‘-48’ post
and the negative probe on the ‘RTN’ post. If -48 VDC is present, proceed to paragraph ‘c’ .
b) If - 48 VDC is not present, c heck and correct all wiring and
fuses to the external office power source. After the source power supply
screws. Verify that the ‘PWR’ indicator is ON and that the red ‘Fuse
Alarm’ indicator is OFF.
1251 Card Removal
Do not remove the 1251 card with out performing and verifying all
items in Step 3 above.
1) Remove fuses F1 and F2 from the 1251 card. Visually verify that
one or more LED indicators are still ON for each of the installed
1557 cards.
Caution: Remove the external office power source before removing the 1251 front panel wiring. This safety measure prevents
accidental shorting and other safety ha zards.
2) Remove the temporary wiring from the external office power
supply.
3) Remove the temporary wiring from the ‘-48’, ‘RTN’, and the
‘GND’ front panel screw terminals.
4) Remove the 1251 card from the chassis. Rep lace fuses F1 and
Power and Alarm Card Replacement
The following procedures should be followed for the replacement of
the APC Power and Alarm card.
The replacement card’s DIP address switches must be set to
match those of the Power and Alarm card presently in the chassis.
1) Before removing the card, set the DIP ad dress switches (positions 1 - 4) on the replacement card to match those of the card to be
replaced.
2) Remove the Power and Alarm card (located in Slot 1 of the 1555
APC chassis) by removing the two front panel thumb screws. When
the card is removed, the 1251 card then suppl ies power to the 1555
chassis and the 1557 APC cards.
3) Insert the replacement Power and Alarm ca rd into the chassi s by
seating it firmly into Slot 1. Secure by tightening the two thumb
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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
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