SECTION 1
GENERAL
Pacific Power Source ©2013
1-5
Document # 126050-10 Rev E
1.6
DETAILED DESCRIPTION
This paragraph provides a detailed description of each major sub-assembly, its
purpose, and its general operation.
1.6.1 3060-MS CABINET
The cabinet consists of a rectifier, three-phase inverter, protective devices, and
accessories as required for proper operation.
1.6.2 RECTIFIER CIRCUIT
The rectifier circuit is a solid-state assembly designed to provide direct current to
the inverter unit.
A 12 pulse input rectifier is used, reducing current harmonic feedback into the
input AC line to a nominal 12%rms. The rectifier also controls the input power
factor so that it remains above 0.85 lagging at full load.
For input isolation and adapting to a variety of available input voltages, a dry type
power transformer is used before the rectifier unit. The transformer's winding
temperature is monitored by Internal Control System diagnostics to ensure that
the transformer temperature does not exceed design limits.
The rectifier circuit provides a soft start-up feature whereby when the AC power
is first applied, the total initial power drawn at the input terminals will not exceed
100% of rated input power.
DC overvoltage protection is provided so that if the DC Bus voltage rises above
the pre-set limit, the Power Source will shut down automatically.
DC undervoltage protection is provided so that if the DC Bus voltage drops below
the pre-set limit, the Power Source will shut down automatically.
AC overvoltage protection on the AC input circuit shuts down the power source
when the input voltage rises above a preset percent of input voltage.
The Low Voltage Power Supply has its own undervoltage protection to shut down
the power source should the power supply voltage to the control circuits fall
below an acceptable level.
