CANOGA PERKINS 9145ELB Network Interface Device Hardware - Manual (Page 5)

9145ELB NID Hardware User’s Manual
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Nominal Minimum Maximum
48 VDC 40 VDC 56.5 VDC
24 VDC 20 VDC 28.3 VDC
The 9145ELB AC and DC units do not incorporate a disconnect device. The plug on the power
supply cord is intended to serve as the disconnect device. It is also recommended that the AC
socket-outlet be installed near the equipment, in an easily accessible location.
The 9145ELB DC models are configured for a DC-I, Isolated DC return.
Fuses
The 9145ELB is equipped with internal fuses. The fuse on the AC models vary by power supply
manufacture 3.15A to 5A. The fuse on the DC models are 3A slow blow.
External fuse recommendation: The 48 DC models are equipped with an internal 5A slow blow
fuse for the 48VDC model and 8A slow blow fuse for the 24VDC model. Although not required,
an external fuse may be used to isolate the unit in a shared fuse distribution panel. Based on the
9145ELB inrush power characteristics, the minimum fuse ratings are as follows: The AC external
fuse is -5A slow blow. the 48VDC external fuse is 6A slow blow. The 24VDC external fuse is 10A
slow blow.
Surge Protection
The AC powered 9145ELB does not contain an internal Surge Protective Device. An external
Surge Protective Device (SPD) should be used at the AC input of the network equipment
according to facilities procedures and as defined by the National Electric Code (NEC).
Grounding
The 9145ELB AC and DC models are suitable for installation as part of the Common Bonding
Network (CBN).
The 9145ELB AC and DC are provided with a safety ground connection which is capable of
conducting any fault current likely to be imposed such as fault current from sources within the
chassis. For the DC model, use an approved 18ga insulated wire connected to the terminal
block’s middle conductor.
The AC will be grounded via the ground conductor of the power cord, which must be connected
to an earthed mains socket-outlet.
An electrical conducting path should exist between the 9145ELB chassis and the metal surface
of the enclosure or rack in which it is mounted or to a grounding conductor. Electrical continuity
should be provided by using thread-forming type mounting screws that remove any paint or
nonconductive coatings and establish a metal-to-metal contact. Any paint or other nonconductive
coatings should be removed on the surfaces between the mounting hardware and the enclosure
or rack. The surfaces should be cleaned and an antioxidant applied before installation.