Rockwell Automation SA3000 High Power Modules - Manual (Page 14)

2-2 High Power SA3000 AC Power Modules
Local Power Interface module (LPI)
The LPI module is the interface between the SA3000 Power Module and the PMI rack.
It is through this module that information is sent to the SA3000 Power Module and
feedback data is sent back to the PMI rack.
Capacitor Bank Assembly
The capacitor bank's electrolytic capacitors store power locally for the IGBTs.
115 VAC Power Supply Assembly
Power Supply Assembly P/N 850100-3S allows for the separation of critical (PMI rack,
25 KHz power supply, DC power supplies) and non-critical (blower motors) 115 VAC
power via two 115 VAC terminal boards and two 25A circuit breakers. Removing the
jumper wires between the two terminal boards provides the separation of critical and
non-critical power. The circuit breakers can be locked in either the ON or OFF position
when the optional locking mechanism is used.
Power Supply Assembly P/N 850100-3R provides one 115 VAC terminal board and
one 25A circuit breaker. This assembly distributes 115 VAC power to the DC power
supplies, the 25 KHz power supply, the PMI rack, and the Power Module blowers. See
figure 4.5.
25 KHz Power Supply Assembly
The 25 KHz Power Supply Assembly provides power to the six IGBT gate drivers in
each Power Module. 25KHz AC power is used for transformer isolation and noise
immunity. Input power is provided by the 115 VAC power supply. See figure 4.6.
DC Bus Voltage Meter (Option)
The DC Bus Voltage meter, which is connected directly across the DC bus, measures
the DC bus voltage being applied to the power module.
Output Meters (Option)
These meters measure the AC voltage (0-600V), current (0-200 percent of full load),
torque (200-0-200 percent of full load), and frequency (120-0-120Hz) being applied to
the motor. These meters are connected to the PMI Processor’s meter ports, which are
under software control.
Main Disconnect (Option)
Depending on system requirements, a DC input disconnect may be provided. Note
that if a disconnect is supplied, the pre-charge assembly option must also be used if
the Power Module is operating from a constant potential DC bus supply.
Pre-charge Assembly (Option)
The Pre-charge Assembly consists of a contactor, pre-charge resistors, and a printed
circuit board assembly. The contactor bypasses the pre-charge resistor after the bus
voltage reaches a programmable threshold value. A pre-charge control module
communicates with the LPI module and controls the pre-charge contactor.