GE DS200UDSAG1AAA Overspeed detection module

Two different types of shutdown commands (emergency and controlled) can be issued through Modbus. The Emergency Shutdown command instantly takes the speed setpoint, valve limiter and actuator current to zero. The Controlled Shutdown function is used to stop the turbine in a controlled manner, as opposed to an Emergency Trip. When a STOP command (controlled shutdown) is issued the Speed Setpoint is ramped to zero at the optional rate. After the Speed Setpoint reaches zero, the valve limiter is instantly stepped to zero.

Start Command through Modbus 

The start-up of a turbine is possible by the command through Modbus. The Open/Close of Contact inputs (RUN/SHUTDOWN etc.) serve as the independent command in Modbus BW. These commands operate in a momentary input. The Emergency Shutdown and Controlled Shutdown commands do not influence operation of Trip Relay. By setting the Shutdown Acknowledge BW to TRUE (one) momentarily, the Trip Relay output can be forcedly returned to a normal state. But its trip condition is not canceled.

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