3-12
October, 1998
GRF 400/1600 Getting Started - 1.4 Update 2
Rack Mount and Power On Procedures
Applying DC power to the GRF 400
DC terminals
Figure 3-6 shows the four terminals on the front of the -48V DC (negative) power supply
drawer. Lucent ships the DC unit fitted with an aluminum cover over the terminal area. The
cover is flipped up to attach the DC input wiring. After the DC unit is properly wired, you must
also secure the cover using the two screws.
Please read through the steps before you begin, refer to Figure 3-6 as you review.
Figure 3-6. Front of -48V power supply drawer.
!
Caution:
The first terminal on the left is a NEGATIVE 48V. The second terminal from the
left is NEGATIVE 48V Return.
Vorsicht
: Der erste Anschluß links ist 48V MINUS. Der zweite Anschluß von links ist die
Rückleitung mit 48V MINUS.
When you connect DC wires, remember that the first terminal on the left is NEGATIVE 48V.
The second terminal from the left is NEGATIVE 48V “RETURN.”
If you connect the two DC wires incorrectly, you blow the input fuses —the DC power supply
will not work now. The power supplies may only be serviced by a qualified trained service
technician.
Site alarm option
!
The right-most terminal, labeled “ALARM”, enables you to attach the DC power supply to a
site alarm unit. If power fails to reach the backplane of the GRF 400, an internal relay activates
and applies the RETURN for the -48V to the site alarm terminal. This output is fused at 0.5A.
When wiring this output, use only UL-recognized terminal lug and conductor suitably rated for
the voltage and current.
SEE INSTR
UCTION MANU
AL
!
-
48V
RETURN
ALARM
Cover area
Always connect a protective earth ground to the terminal with this label:
