- 480 Volt Three-Phase Connections
- Neutral Input Connection
- Output Connections to the Load
These connections are made to the terminal blocks. There are several voltage sources that are developed internally for the system. Illustration 1 shows the electrical location and the configuration for these internal voltage sources.
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| Illustration 1 | g00729548 |
Diagram of the Power Source | |
Input 110 VAC Source - This source is derived from a 480 volt to 110 volt step-down transformer (T1). The primary terminals are connected to the input node. The source is used in order to control the bypass contactor (K3) and the input contactor (K1).
Inverter 110 VAC Source - This source is derived from a 480 volt to 110 volt step-down transformer (T2). The primary terminals are connected to the inverter node. The source is used in order to provide power to the vacuum pump and the cooling fans.
Positive 24 VDC Source - This source is derived from a 480 volt to 35 volt step-down transformer (T3). The primary terminals are connected to the output node. The output of the transformer is rectified and regulated in order to obtain a constant voltage of 24 VDC. The source is used by most of the system's circuit boards.
450 VDC Bus - This power source is initially obtained by rectifying and magnifying the voltage that is present at the inverter node. The source is used in order to drive the field coils in the flywheel. The source also creates the currents that are needed in order to rotate the flywheel.