BOLT 9S1362 - Caterpillar

The system uses a number of circuit boards for system operation and monitoring.AC Signal Interface (ACI) - The AC Signal Interface board monitors the voltages that are on the following nodes: input, filter and output. 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.Bypass Cabinet Controller (BCC) (Single Module System) - This is the controller for the static switch bypass option in a single-module system. The Bypass Cabinet Controller receives logic signals. The Bypass Cabinet Controller drives the gate signals of the bypass static switch.Inverter Interface Board (SKI) - The Inverter Interface Board (SKI) provides the gate signals that are sent by the system controller to the inverter modules. Then, the Inverter Interface Board (SKI) 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 Inverter Interface Board (SKI).DC Interface (DCI) - The DC Interface board provides a feedback signal for the bus voltage to the controller.Note: The DC Interface (DCI) also monitors the status of the fuses that are located between the capacitors and the DC common of the bus on models (UPS) that are prior to revision 2.4.Dual 24 VDC Power Supplies - The dual 24 VDC power supplies are used to power all the circuit boards in the system.EMI Filter (EMI) - The board filters the electronic noise from the lines for the three-phase AC. There is an EMI Filter (EMI) on the input terminals and there is an EMI Filter (EMI) on the output terminals.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.Field Coil Driver (FCD) - The field coil driver board converts the signals from the system controller into isolated signals that are used by the field coil IGBTs. The field coil driver also provides current feedback of the top and bottom field coils.Flywheel Interface (FWI) - For systems that are prior to 2.4 release, 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. If the flywheel is equipped with a load cell, this board is the interface between the load cell and the system controller. This board is the interface between the following components and the System Controller on systems that are version 2.4 and later versions: Load Cell, Top Bearing, Temperatures, Temperatures (Field Coil), Armature Temperatures, Bottom Bearing Temperatures, Speed Sensing and Signals (Vibration).Generator Set Start Controller (GSC) - This is the controller for the genset start option. The Generator Set Start Controller (GSC) provides the gate signal to the IGBTs for the Generator Set