GE DS215LRPBG1AZZ02A Serial Link Module

04 MPU MIN SPD LEVEL (RPM) dflt= 250.0 (0.0, 2000) Enter the minimum detectable speed level for the control. Below this level the MPU would be detected as failed and a trip will be issued. The MPU input signal must be at least 1.0 Vrms at the minimum speed level programmed. 05 NUMBER OF TEETH dflt=60 (16, 500) Enter the number of teeth or holes of the gear that the magnetic pickup unit (MPU) is mounted to. This value is used to determine the hertz-to-rpm relationship.

The maximum input frequency 

that can be measured by the speed sensing circuit is 25,000 Hz. Therefore to allow for transient conditions, the Number of Teeth times Rated RPM divided by 60 should be less than 19,000. The number of gear teeth is used by the control to convert pulses from the speed-sensing device to turbine rpm. To prevent possible serious injury from an over speeding turbine, make sure the control is properly programmed to convert the gear-tooth count into turbine rpm. Improper conversion could cause turbine overspeed.

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