GarrettCom DS 880 - Manual (Page 32)

Magnum DS880 Dual-Speed Stackable Hubs Installation and User Guide (05/01)
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B4.0 INSTALLATION
This section describes the installation of the 48 VDC power source leads to the 48
VDC power terminal block on the Magnum DS880s. (see figure below).
Figure B4.1: 48 VDC Terminal Block
on Magnum DS880-48VDC
The 48 VDC terminal block on
the Magnum DS880s is located on the rear
of the unit and is equipped with three (3)
screw-down lead posts. The leads are
identified as negative (-), positive (+), and chassis ground (GND). The actual connection
procedure is very straightforward. To avoid the confusion of -48V or +48V power supply,
use a digital voltmeter to measure the output voltage and figure out the +VE Lead. The
more +VE voltage terminal lead from the +48V or-48V power supply should be
connected to the post leveled “+” and then the rest. Ensure that each lead is securely
tightened.
36-70VDC
_
+ GND
ON
OFF
On the premium-priced NEBS-compliant Magnum DS880-48V models, an ON-OFF
switch is included, located in the rear at the power input. This can be used in conjunction with
power connections, and as a RESET for the hub’s electronics.
B4.1 UL Requirements
1. Minimum 14 AWG cable for connection to a Centralized DC power source.
2. Fastening torque of the lugs on the terminal block: 9 inch pound max.
3. Centralized DC Power Source cable securement, use at least four cable ties to secure
the cable to the rack at least 4 inches apart with the first one located within 6 inches
of the terminal block.
B5.0 OPERATION
Operation of the Magnum DS880s with the optional 48VDC power supply is identical
to that of the standard AC-powered models.
B6.0 TROUBLESHOOTING
Please refer to Section 5.0 for troubleshooting