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Magnum 1000 Workgroup Hubs Installation and User Guide (04/02)
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APPENDIX B : Internal DC Power Supply Option
B1.0 SPECIFICATIONS - FOR MAGNUM 1000 WORKGROUP HUBS
Power Supply (Internal -48 VDC Option)
DC Power Connector: 3 terminals: “-“, “GND”, “+”
Input Voltage: 36 - 70 VDC (auto-ranging)
Power Consumption: Magnum 1000’s Hubs: 10 watts typical,
20 watts max. P.S. rating
Power Supply (Internal 24 VDC Option)
DC Power Connector: 3 terminals: “-“, “GND”, “+”
Input Voltage: 20 - 40 VDC (auto-ranging)
Power Consumption: Magnum 1000’s Hubs: 10 watts typical,
20 watts max. P.S. rating
Power Supply (Internal 125 VDC Option)
DC Power Connector: 3 terminals: “-“, “GND”, “+”
Input Voltage: 120 - 160 VDC (auto-ranging)
Power Consumption: Magnum 1000’s Hubs: 10 watts typical,
20 watts max. P.S. rating
With the exception of the power supply, all specifications and functions of
Magnum 1000 Workgroup Hubs-48VDC, 24VDC & 125VDC models are identical
to those listed in the main manual.
B2.0 -48VDC, 24VDC & 125VDC POWER OPTION, THEORY OF
OPERATION
The -48VDC, 24VDC & 125VDC power option is designed using diodes
inside on each DC power input line behind the two external power connection terminals,
so that the power from an external
source can only flow into the hub. This
allows the hub to operate only
whenever DC power is correctly
applied to the two inputs. It protects
the hub from incorrect DC input connections. An incorrect polarity connection, for
example, will neither effect the hub, nor its power supply internally, nor will it blow the
fuse in the internal power supply.
Disconnecting the power source is used for powering the hub on and off when
it is placed into or taken out of service.
A+
A-
GND
GND
CHASSIS
FUSE
+
-
SUPPLY
HUB