Power Connection
Figure 3-1
CHAPTER 3 - INSTALLATION
3.1
INPUT VOLTAGE
The DMM-4DC is designed to accept DC voltages of 36 to 72 vdc, with 48 vdc as the nominal
input voltage. Located on the back of the DMM-4DC is a 2-position terminal block. The block is
removable and accepts a small slotted screwdriver to fasten the users DC voltage wires. The wire
strip length should be 7mm or .24 inches.
3.2
VOLTAGE FUSES
The DMM-4DC is designed with internal safety fuses for your protection. Located inside the
product are two 315ma slow blow 5 x 20mm fuses. If the power LED is not illuminated,
disconnect the input DC power source
, remove the top cover and inspect the fuses. Spare fuses
may be obtained by calling East Coast Datacom Replacement fuse Part # 714003 or by calling:
Little Fuse at (312) 824-3024, Part # 218.315
Shurter, Inc. at (707) 778-6311, Part # 034.3112
Panel Components (800) 662-2290, Part # 81412321
3.3
POWER/GROUND CONNECTION
Before connecting the DMM-4DC to a DC power source the top cover MUST be installed with
the supplied #8-32 screws.
1)
Connect the ground lead to the #6 stud located on the rear of the DMM-4DC marked
GND
(ground)
2)
Connect the -48V wire to the termial block labeled
48V NEG
.
3)
Connect the 48V RTN (return or +) wire to the termial block labeled
48V RTN
.
DMM-4DC OPERATIONS MANUAL
Page 6
CAUTION:
Disconnect Power Before Servicing
ATTENTION:
Couper Le Courant Avant l' Entretien
VORSICHT:
Befor Deckung Abnehmen Mach Strom Zu
MASTER
GND
48V
NEG
48V
RET
- +
GND
48V
NEG
48V
RET
DMM-4DC - REAR VIEW
