The Siemens 6SE7090-0XX84-1GA1 is a Voltage Sensor Board (VSB) module designed for the SIMOVERT MASTERDRIVES AFE (Active Front End) drive systems. Its core function is to continuously measure the three-phase AC power supply voltage at the drive's input, providing real-time analog signals to the CUSA (AFE control module) for synchronization calculations. This enables the AFE inverter to switch in sync with the line voltage, ensuring stable and efficient regenerative operation.
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