Verilink 1251 (CG) Configuration/Installation Guide - Manual (Page 2)

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 ‘-48’ screw termi-
nal to the respective -48 VDC lead of the external office supply.
6) Connect a wire (26 gauge or larger) from the ‘Return’ screw ter-
minal to the respective return lead of the external office supply.
7) Insert fuses F1 and F2 back into the 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, per-
form 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, pro-
ceed to paragraph ‘c’.
b) If -48 VDC is not present, check and correct all wiring and
fuses to the external office power source. After the source power supply
is corrected, -48 VDC will be present at the 1251 front panel terminal.
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’ indicator 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.
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 chas-
sis.
1) Before removing the card, set the DIP address switches (posi-
tions 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 supplies power to the 1555
chassis and the 1557 APC cards.
3) Insert the replacement Power and Alarm card into the chassis by
seating it firmly into Slot 1. Secure by tightening the two thumb
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 without 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 remov-
ing the 1251 front panel wiring. This safety measure prevents
accidental shorting and other safety hazards.
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. Replace fuses F1 and
1251 Card Installation
The following procedures should be followed to insure proper installa-
tion 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 inspect
for any physical damage which may have occurred during shipping. If
damage is visible, do not attempt to install this card. Follow the nor-
mal internal maintenance procedures for returning the card and
obtaining a replacement.
2) Insert the 1251 card into any vacant APC slot. Ensure that the
card is fully seated and secure the card into the chassis by hand tight-
ening the two front panel thumb screws.
3) Remove the front panel fuses (F1 and F2) from the 1251 card.
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