SST SST-1500-170 Digital expansion card

SST SST-1500-170 Digital expansion card

1. PROGRAM MODE: Made all start modes default to false to ensure a customer programmed the unit. Also added an error check to ensure Rated Speed (when programmed as a gen set) was less than max gov. 2.SST SST-1500-170 SERVICE MODE: Changed the hold changes for Min Load to come from the Breaker Logic header's Hold Changes input. Previously the hold changes command was selected under the Speed Control Settings header. 3. SST SST-1500-170SPEED SETPOINT RATES: Changed the minimum adjustment range for all speed setpoint rates to 0.01 (was 0.1). 4. AUX LIMITER or CONTROLLER: Added logic to ensure the inhibited status of Aux control when the input is failed. In addition, changed Aux re-enable logic such that when a failed aux input is restored there is no glitch to the speed LSS. Also changed breaker open logic to correct a Gen Opening Aux actuator output glitch.SST SST-1500-170

5. SST SST-1500-170AUX CONTROLLER: Changed the speed setpoint aux biasing logic to only allow the speed control limiting action (while in aux control) to be active when the speed setpoint reaches max gov. Prior to this fix the speed limiter could come into control during an extreme transient. 6. AUX DIRECT ENTERED SETPT: Changed Aux Entered setpoint to be reset/ stopped on a shutdown pulse rather than held disabled on a shutdown condition. This change allows the Aux Limiter function direct setpoint entry even when the unit is tripped. 7.SST SST-1500-170 AUX, CASC, and EXTR DROOP: Changed the droop feedback lag-tau tunable range from a max of 10 to a max of 1000.

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