System Controller - This controller is the brains of the system. All of the control signals for the inverters, field coil drivers, and the static switch originate from the controller. All of the status and the telemetry signals in the system are sent to the controller for monitoring.
AC Signal Interface (ACI) - The AC Signal Interface board monitors the voltages that are on the input node, the inverter node, and the output node. The board also monitors the currents that are on the input node and the output node. Contactor K1 and contactor K2 are controlled via two solid state relays that are located on the board. The 24 volt coil signals for relays CR1 and CR2 are controlled through the board.
DC Interface (DCI) - The DC Interface board provides a feedback signal for the bus voltage to the controller. The board also monitors the status of the fusible links that are located between the capacitors and the neutral termination on the bus. The fusible link has a status bit. The bit is sent to the system controller.
Flywheel Interface (FWI) - The flywheel interface board provides the current for the hall effect sensors. The sensors are located on the inside of the flywheel. The sensors pass the flywheel's telemetry signals to the system controller.
Field Coil Driver (FCD) - The field coil driver board converts the signals from the gate of the logic level field coil driver into isolated signals that are used by the field coil drivers. The field coil driver also provides the top and the bottom current of the field coil and the feedback signals of the temperature to the system controller.
Inverter Interface (SKI) - The inverter interface board provides the gate signals that are sent by the system controller to the inverter modules. Then, the interface board sends a current feedback signal and a status signal from the inverter module to the system controller. Each inverter module in the system is connected to a SKI.
Static Switch Interface (SSI) - The Static Switch Interface board converts the signals from the gate of the logic level thyristor to an isolated signal that is used by the thyristors.
Comm/Accel (CAC) - This is an assembly that contains the comm/accel printed wire assembly and the commutation sensor wheel. The board generates the commutation signal that is used by the system controller in order to derive the gating signals for the flywheel inverter modules. The board also generates the signals that are used to monitor the levels of vibration in the flywheel.
Fan Monitor (FAN) - The Fan Monitor board monitors the status of the cooling fans. The cooling fans are located on the top of the system. Each fan has a status bit that is sent to the system controller.
User Interface (UIF) - The User Interface board provides system telemetry and data about the state of the system to the display panel. The display panel consists of the following components: LCD display, three LED, keyswitch and EPO switch. The board also sends signals about the status of the EPO switch and the keyswitch back to the system controller.
System Input/Output and Isolation Board ("SIO") - The board provides a barrier between the controller and all of the communications ports that are used by the system in order to communicate outside of the system. The following ports reside on the "SIO": Ethernet, COM RS-232/RS-485, modem, UPS Net and CAN. There is also a set of dry contact inputs and dry contact outputs.
Main Regulator Board (BUCK) - The 24 volt regulator is the main power source for 24 VDC. This power source is used by all of the boards that are installed in the controller.
EMI Filter (EMI) - The board filters the electronic noise from the lines for the three-phase AC.
Power Distribution (PWD) - The board distributes the power sources and the board fuses the power sources that are used throughout the system. The power sources that are distributed are the 24 VDC power supply, the 110 VAC for the input, and the 110 VAC for the inverter .
Field Coil Termination (FCT) - These boards provide an interface between the wiring harness for the field coil and the field coils. Fuses for the field coils are installed on this board as well.
The circuit boards in the system are designed to isolate voltage at different levels.
Satellite boards are the boards that receive the control signals. The boards also transmit status signals. The boards are connected to the controller via ribbon cable. Some of the boards serve as the signal feed to some other type of wiring.
Most of the boards use the 24 VDC power supply in order to create ±15 volt supplies and ±5 volt supplies. The controller also generates 3.3 volts for the large scale integration devices.
The boards that transmit signals to the controller use a serial peripheral interface (SPI) bit stream.