User Manual

28 Part 003609A revision 01 December 16, 2002
Amosphere NPM Installation Procedures (WCS)
Main Power Bay Circuit Breaker Size
Each NPM rack requires three +24V DC inputs. Table 2.9 shows the
recommended circuit breaker sizes for each +24V line.
Backup Power
The NPM does not contain any internal battery backup systems. Ensure that
your main power source has a backup power system in case of a power failure.
Power Bay Ground and Voltage Levels
Table 2.10 shows the required electrical levels as measured at the PDP terminals.
Configuration Radio Rack RF Rack
6 sectors 40A per breaker (3) 130A per breaker (3)
3 sectors 30A per breaker (3) 70A per breaker (3)
1 sectors 20A per breaker (3) 40A per breaker (3)
Table 2.9 Main Power Bay Circuit Breaker Size
Unit Measurement Specification
Voltage +24V DC (+) to return (–) +27.5V DC nominal
(25.0V DC min, 28.0V DC max)
Power +24V DC (+) to return (–) 10kW minimum
Voltage Return (–) to ground 0.5V DC maximum
Resistance Return (–) to ground 0.1Ω maximum
Voltage +24V DC (+) to ground +25.0V to +28.5V DC
Table 2.10 Required Ground Levels