AC Power Distribution
Circuit/Mechanical Descriptions
For purposes of this description, assume the Workstation is connected to facility power correctly, and the Workstation and C-Arm
are correctly connected via the Interconnect Cable. Before you turn on the Workstation power switch, 115VAC_PH is present at
connector P5 of the C-Arm Power/Signal Interface PCB, and energizes the battery charger light and the battery charger.
However, at this point, no power is available for any other C-Arm circuits.
When you turn on the workstation, KEY POWER is turned on, and connects 115VAC_PH to the other C-Arm circuits, thus
initiating the bootup process.
In addition to the battery charger, AC power is distributed to Power Supply PS1, PS2, PS3, and the stator, as illustrated in the
following diagram:
Note: For clarity, the return connections are not described in the following circuit descriptions. These descriptions are intended
only to show you how things work, not to go into full details of the entire power system.
AC Power to PS1 and PS2
Whenever the Workstation power switch is on, PS1 and PS2 are held energized by Key Power as follows:
1. On the Power Signal Interface PCB, incoming operating power (115VAC_PH) flows through fuse F4, then leaves the PCB as
115VAC_PH_IN.
2. The 115VAC_PH_IN enters the Power Motor Relay PCB, and goes to the input contact of the K10 relay. When the contact is
switched, the power returns to the Power Signal Interface PCB as 115VAC_PH_SW.
3. Key Power furnished by the Workstation via the Interconnect cable energizes the K10 relay coil when the Workstation is
turned on. Refer to the following diagram:
4. For PS1, the 115VAC_PH_SW passes through Fuse F6 and Line Filter LF2 on the Power/Motor Relay PCB, and exits at
Connector P9.
5. For PS2, the 115VAC_PH_SW passes through Fuse F6 and Fuse F10, on the Power/Motor Relay PCB, and exits at
connector P4.
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