User's Manual

SEL-3031 Instruction Manual Date Code 20091009
Installation
Connections
2.8
Power Connections
The POWER terminals on the rear panel (labeled +/H and -/N) must connect to the
correct supply voltage. The supply voltage range is located on the serial label. The
wall-mount configuration accepts only 9–30 Vdc. The rack-mount configuration
accepts 24–48 Vdc or 125/250 Vac or Vdc. Check the serial label for power supply
information.
Do not apply power to the SEL-3031 without having a proper 50- load on the antenna
port. If you do not have the proper 50- load connected, the radio antenna port will
shut off, the alarm contact will pulse, and the
ALARM LED will illuminate. This
functionality protects the radio circuitry and indicates an antenna or cable failure. The
POWER terminals on the rack-mount version are isolated from chassis ground. The
POWER terminals on the wall-mount version are not isolated from chassis ground. Use
2.5 mm
2
(14 AWG) size wire to connect to the POWER terminals on the rack mount.
Place an external circuit breaker or switch no more than 3 meters (9.8 feet) from the
equipment. The circuit breaker (or equivalent approved disconnect device appropriate
for the country of installation) must comply with IEC 60947-1 and IEC 60947-3, be
identified as the disconnect device for the equipment, and be located near the
equipment. This disconnect device must interrupt both the hot (+/H) and the neutral
(–/N) power leads. The maximum current rating for the power disconnect circuit
breaker or overcurrent device (fuse) must be 20 A. An internal power supply fuse
protects the operational power supply. Be sure to use fuses that comply with
IEC 60127-2.
Lightning Protection
!
WARNING
Atmospheric electrical charge accumulation can cause potential between the
conductor and shield of the feedline, or cause lightning to strike an antenna.
A lightning protector should be installed to prevent damage to equipment or
injury to personnel.
Mounting the antenna on an equipment building roof or tower is safest because the
potential rise on the outside of either of these structures will approximately equal the
potential on the inside. A lightning protector (Gas Tube Coaxial Surge Protector, SEL
part number 915900139) should be used to equalize the difference in potential that can
occur between the center conductor and the shield of the coaxial cable between the
antenna and the radio. The higher the antenna is mounted on a support structure, the
greater the probability of equipment damage resulting from a lightning strike.
In all surge-protector applications, you should mount the surge protector at the building
or enclosure entrance, and ground the surge-protector body. Ground the radio to the
same point as the surge-protector ground to avoid ground-rise-potential damage.
When using the surge protector, order an additional C965 or C961 cable and place this
cable between the SEL-3031 and the surge protector. Because the distance varies from
the SEL-3031 to the surge protector, be sure to specify this cable at approximately the
correct length (plus 10 to 20 percent for installation variability).