User's Manual

044-05117
1-5 General Safety
This paragraph describes safety practices when handling certain components.
1-5.1 Lifting Standards
The handling of the power amplifier cabinet and its subassemblies involves heavy lifting. Various methods of
lifting must be employed to safely and properly install this equipment. The following web site addresses are
provided as references to OSHA personnel lifting guidelines:
http://www.osha.gov/SLTC/etools/electricalcontractors/materials/heavy.html
http://www.cdc.gov/niosh/pdfs/94-110.pdf
Lifting of heavier modules may require two people in awkward work environments, whereas only one person
might otherwise be able to safely lift the module. Be aware of the environmental impact on lifting and twisting
while moving heavier materials.
The Amplifier weighs 12.97 kg (28.5 lb) and can normally be lifted by one person.
1-5.1.1 Power Plant
Only qualified electricians, certified to work on high voltages (176 to 264 Vac; 150 A), should perform
installation and maintenance to the cabinet and rectifier inputs. Failure to follow safe practices may result in
equipment damage, personal injury or death.
Never remove bare DC power wires from equipment or allow bare DC voltage wires to dangle freely in the
cabinet. Prior to removal of equipment that necessitates dangling of DC wires, disconnect DC power at the
LVD and turn the rectifiers off. Verify with a voltmeter that DC power is removed prior to disconnecting
equipment.
Refer to NEC Article 810, for clearances from power and lightning conductors, mounting, and grounding.
1-5.1.2 Electronic Modules
Electronic modules should be turned off before removal, when an on/off switch is provided. For example, the
amplifier module draws up to 26 amperes of current with no RF energy applied. Failure to turn the amplifier
module off before removal will cause arching between the amplifier module and the amplifier subrack,
resulting in damage to both pieces of equipment.
RF energy should be turned off before removal or installation of RF cables. Failure to RF energy may result in
equipment damage or personal injury.
Electronic modules should be turned off before removal or installation of electronic interconnecting cables.
1-5.1.3 Electrostatic Discharge
The power amplifier cabinet contains modules and components that are sensitive to static electricity. Two
Electrostatic Discharge (ESD) service points are incorporated in the cabinet frame. One service point is
located in the interior front electronics compartment about half way down the right hand vertical rail. The other
service point is located in the interior rear electronics compartment about half way down the left hand vertical
rail.
ESD protective devices must be properly worn and connected to one of the cabinet ESD service points by
technicians and installers during the performance of maintenance activities.
1-6 Installation and Service Manual - G3L-850-135 Multi-Carrier Power Amplifier