User's Manual

Date Code 20091009 SEL-3031 Instruction Manual
Installation
Connections
2.9
Grounding (Earthing) Connections
You must connect the ground terminal labeled GND to a rack frame or
switchgear ground for proper safety and performance. Use 2.5 mm
2
(14 AWG)
wire less than 2 meters (6.6 feet) in length for the ground connection.
Serial Ports
Because all ports (1, 2, and 3) are independent, you can communicate to any
combination simultaneously. All EIA-232 ports accept DB-9 male connectors. The
serial port EIA-485 option for Port 1 is also a DB-9 male connector. If Port 1 is ordered
with the EIA-485 option the product will ship with a DB-9-to-terminal adapter to
easily wire to EIA-485 systems. Port 2 includes the IRIG-B time-code signal input (see
Table 2.6). SEL offers fiber-optic transceivers or fiber-optic port options on Port 1
(SEL-2812 compatible optic) for connecting devices at distances over 15 meters (50
feet) where copper cable is not appropriate. The SEL-2800 family of transceivers
provides fiber-optic links between devices for electrical isolation and longer distances,
overcoming the limitations of electrical EIA-232 interfaces. Contact SEL for further
information on these products.
Front-Panel Jumpers
The front panels of the rack- and wall-mount configurations contain two jumpers.
Access to the jumpers is different for each configuration. Note that jumper number 1
(JMP1) is for factory use only and should not be installed.
The radio contains devices sensitive to Electrostatic Discharge (ESD).
Undetectable permanent damage can result if you do not use proper ESD
procedures. Ground yourself, your work surface, and this equipment before
removing any cover from this equipment. If your facility is not equipped to
work with these components, contact SEL about returning this device and
related SEL equipment for service.
!
CAUTION
Wall-Mount Chassis Jumper Access
From the front of the wall-mount configuration, remove the four screws located on the
sides of each corner. Use a Torx
®
T15 size screwdriver to remove the four screws.
Slide the back cover up and to the back of the unit to reveal the front jumpers. You do
not need to remove the ribbon cable to change jumpers. The jumpers are located to the
left of the USB connector.
Rack-Mount Chassis Jumper Access
From the front of the rack-mount configuration, remove the front panel by loosening
the six screws and removing the front panel. You will find the jumpers to the left of the
USB connection.