Eaton SC9000 VFD
With the Eaton SC9000 VFD double-bus, a second 1200 amp VFD bus is located above the main bus, adding only 8 inches of additional height to the system. The Ampgard SC 9000 doublebus enables close-coupling of an optional 24-inch-wide drive output contactor and multiple motor bypass and motor select contactors under a common bus alignment. Ampgard SC9000 integrated Control – Gear synchronous transfer control design gives Eaton’s customers the benefit of a compact and reliable system.
SC9000 Features
The Eaton SC9000 VFD double-bus is integrated with a 24-inch-wide drive output contactor (optional) and 36-inch-wide motor bypass and motor select contactors structure that can be equipped with a 400 amp or 800 amp contactor, as required. A 400 amp motor bypass contactor and a 400 amp motor select contactor can be double-stacked in a single, 36-inch-wide cabinet for motor systems up to 3000 horsepower.
Eaton SC9000 VFD Ampgard double-bus design for synchronous transfer control was first to market. Do not be misled by “cable copy cats” 800 amp motor bypass and motor select contactor assemblies, which require two 36-inch-wide structures for a total width of 72 inches per motor.
Synchronous transfer systems help power generating facilities maximize the capital efficiency of their systems by controlling multiple motors with one adjustable frequency drive. Most manufacturers synchronous transfer control system have multiple drive output and motor select contactors that are interconnected typically via cables to allow the VFD to manage multiple motors.
With the Eaton SC9000 VFD Ampgard and the Ampgard Integrated Control – Gear VFD double-bus design, the drive output and motor select contactors are close-coupled under a common power bus (no cables) giving customers the compact design and superior performance they expect from the Eaton brand.
The basic principle of synchronous transfer control is to adjust the Eaton SC9000 VFD output voltage, frequency and phase to match the utility. By matching these parameters, the drive system can transfer a motor from the SC9000 output to the utility in a “bump-less” manner. The Eaton SC9000 VFD and PLC systems are programmed to start or stop a single motor, as well as sync up or down to other motors as needed. Upon system startup, the SC 9000 and VFD bus are energized. The PLC closes the drive output contactor and the designated motor select contactor and starts the SC9000, allowing power to be directed to the desired motor (M1 above) for operation. The designated motor can now be operated at adjustable speed as needed. When an additional motor is required, the PLC will send the sync up command to the SC9000.
The Eaton SC9000 VFD adjusts its output to match the line voltage, frequency and phase angle. Once the drive output and line are synchronized, the system will transfer the motor from the drive output to the utility by opening the motor select contactor (M1) and closing the motor bypass contactor (B1). Once synchronization is locked, the adjacent motor select contactor (M2) is closed, and the Eaton SC9000 VFD can now operate the additional motor at variable speed as needed.
To learn more about the Eaton SC9000 VFD, visit the Eaton Website.
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