Powerwave Technologies G3L-850-135, Service And Installation Manual

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044-05117
Chapter 2 Installation
2-1 Introduction
This chapter contains unpacking, inspection, and installation instructions for the G3L-850-135
Multi-Carrier Power Amplifier (MCPA). It is important that the licensee perform the following tasks
correctly. Carefully read all material in this chapter prior to equipment unpacking or installation.
Also, read and review the operating procedures in chapter 3 prior to installing the equipment. If
applicable, carefully review the government and local codes as they apply to your installation.
2-2 Site Survey
Powerwave Technologies recommends that site surveys be performed by qualified individuals or
firms prior to equipment ordering or installation. Performing a detailed site survey reduces or
eliminates installation and turn-up delays caused by oversights. Pay particular attention to power
plant capacity, air conditioning needs, and RF/DC cabling/breaker requirements.
2-3 Electrical Service Recommendations
Powerwave Technologies recommends that proper AC line conditioning and surge suppression
be provided on the primary AC input to the +27 Vdc power source. Install all electrical service in
accordance with applicable local codes and good engineering practice. Give special
consideration to lightning protection of all systems, given the vulnerability of most transmitter sites
to lightning. Lightning arrestors are recommended in the service entrance. Straight, short ground
runs are recommended. The electrical service must be well grounded.
The information in Table 2-1 is provided as a guideline. Follow the appropriate standards in the
National Electrical Code (NEC ) and codes for your area, and observe the cable manufacturer’s
recommendations for proper cable selection.
Table 2-1. Sample of DC Cable Ratings
Copper Aluminum
3 Cond. In Raceway Single Conductor In Free Air 3 Cond. In Raceway Single Conductor In Free Air
mm
2
90
°
C 110
°
C 90
°
C 110
°
C 125
°
C 200
°
C 90
°
C 110
°
C 90
°
C 110
°
C 125
°
C 200
°
C
2 25 30 30 40 40 45 -- -- -- -- -- --
3 30 35 40 50 50 55 25 25 30 40 40 45
5 40 45 55 65 70 75 30 35 45 50 55 60
8 55 60 75 85 90 100 40 45 55 65 70 80
13 70 80 100 120 125 135 55 60 80 95 100 105
21 95 105 135 160 170 180 75 80 105 125 135 140
34 125 135 185 210 225 240 100 105 140 165 175 185
42 145 160 215 245 265 280 110 125 165 190 205 220
53 165 190 250 285 305 325 130 150 190 220 240 255
Based on ambient temperature of 30
°
C (86
°
F) 100% Load Factor
Source: Industrial Electric Wire & Cable Inc., Technical Guide Vol. 4M 11/99, Table III Suggested Ampacities - All Types
of Insulations; Based on National Electric Code
Each amplifier system should have its own circuit breaker, so a failure in one does not shut off
the whole installation. Circuit breakers should be capable of handling the anticipated inrush
current, in a load center with a master switch. Powerwave recommends that a 50 A circuit
Installation and Service Manual - G3L-850-135 Multi-Carrier Power Amplifier 2-1