APPENDIX B : Internal DC Power Supply Options
B1.0 SPECIFICATIONS - FOR RFL 3000 4K8 DC-POWERED SWITCHES
Power Supply (Internal -48VDC Option)
DC Power Connector: 3 terminals: “-“, “GND”, “+”
Input Voltage: 36 - 70 VDC
Power Consumption: Model 4K24: 21 watt typical, 30 watts max.
Power Supply (Internal 24 VDC Option) Industrial Application
DC Power Connector: 3 terminals: “-“, “GND”, “+”
Input Voltage: 20 - 36 VDC
Power
Consumption:
Model
4K24: 21 watt typical, 30 watts max.
Power Supply (Internal 125 VDC Option) Industrial Application
DC Power Connector: 3 terminals: “-“, “GND”, “+”
Input Voltage: 120 - 160 VDC
Power
Consumption:
Model
4K24: 21 watt typical, 30 watts max.
With the exception of the power supply, all specifications and functions of RFL
3000 4K-Series-48VDC, 24VDC and 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 are 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 Switch to
operate only whenever DC power is correctly applied to the two inputs. It protects the
Switch from incorrect DC input connections. An incorrect polarity connection, for
example, will neither affect the Switch, its internal power supply , nor will it blow the
fuse in the internal power supply.
The manual power “On-Off” Switch (optional) is used for powering the unit on
and off when it is placed into or taken out of service.
A+
A-
GND
GND
CHASSIS
FUSE
+
-
SUPPLY
HUB
POWER SWITCH