- Three-phase connections from the supply
- Neutral input connection for four-wire systems only
- Three-phase connections to the load
These connections are made to the terminal blocks. There are several voltage sources that are developed internally for the system.
Input 230 VAC Source - This source is derived from a multi-tap control power transformer (T1). The primary terminals are connected to the input node. The input 230 VAC source is used to provide power to the following components: the bypass contactor (K3 - SMS only), the input contactor (K1), cooling fan 2 and cooling fan 5.
Output 230 VAC Source - This source is derived from a multi-tap control power transformer (T2). The primary terminals are connected to the output node. This source is used to provide power to the following components: the vacuum pump, the output contactor K2, cooling fan 1, cooling fan 3, cooling fan 4 and cooling fan 6.
190 VAC Source - This source is derived from multi-tap control power transformers (T1, T2, and T3). T3 is only in the system cabinet of multiple module systems. This source is rectified to 268 VDC on the power distribution board. This source is used to supply power to the dual 24 VDC power supplies.
24 VDC Source - This source is derived from dual 24 VDC power supplies. The source is used by most of the system circuit boards.
±400 VDC Bus - This power source is initially obtained by rectifying and magnifying the voltage that is present at the filter node. The source is used to drive the field coils in the flywheel. The source is used by the flywheel converter.