Instruction manual

893-839-C B-5
5. Snap the safety cover back into place over
the terminals.
6. Attach the positive and negative terminal
leads to the DC input power source accord-
ing to the proper safety and technical specifi-
cations for your −48 V DC power
distribution system.
7. Turn on the DC power input source.
8. Turn the DC hub toggle power switch to the
On position.
7073
Redundant
Power
CAUTION
!
!
This unit has more than one D.C. power supply input.
To reduce the risk of high energy levels and/or fire hazard
disconnect both D.C. power cords prior to service.
40-56 VDC, 2.0-1.5A
Redundant Power
+12 VDC @ 1.6A
–12 VDC @ 0.5A
+5 VDC @ 7A
+
–
7074
Troubleshooting
• The DC hub green power LED does not light on initial power up.
– Verify that the power source meets the power requirements of the hub.
– Check the DC input power source to ensure that DC current is flowing.
– Verify proper polarity of the attached terminal leads.
NOTE: If the leads have accidentally been attached so that polarity is reversed, the hub will
not respond. When the leads are reconnected correctly, the green power LED will light and
the hub will power up.
893-839-CBook Page 5 Thursday, December 12, 1996 4:18 PM