Basler Electric DECS-400 User Manual
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9369700990 Rev R
Digital to Analog Converter .................................................................................................................. 31
Control Output Circuits ........................................................................................................................ 31
Meter Driver Circuits ............................................................................................................................ 31
Relay Output Contacts ......................................................................................................................... 31
Front Panel LEDs................................................................................................................................. 32
Front Panel LCD .................................................................................................................................. 32
RS-232 Communication Port ............................................................................................................... 32
RS-485 Communication Ports ............................................................................................................. 32
Ethernet Port ........................................................................................................................................ 33
Modem ................................................................................................................................................. 33
Power Supply ....................................................................................................................................... 33
Startup Functions .................................................................................................................................... 33
Soft Start Function ............................................................................................................................... 33
Field Flash/Buildup .............................................................................................................................. 33
Failure to Build Up ............................................................................................................................... 34
Voltage Matching ................................................................................................................................. 34
Control Modes ......................................................................................................................................... 34
AVR ...................................................................................................................................................... 35
Manual ................................................................................................................................................. 35
Var ....................................................................................................................................................... 35
PF ........................................................................................................................................................ 36
Control Mode Pre-Position Setpoints ................................................................................................... 36
Transient Boost .................................................................................................................................... 37
Protection Functions ................................................................................................................................ 37
Field Overcurrent ................................................................................................................................. 37
Field Overvoltage ................................................................................................................................. 38
Generator Undervoltage ...................................................................................................................... 38
Generator Overvoltage ........................................................................................................................ 38
Loss of Sensing Voltage ...................................................................................................................... 38
Loss of Field Isolation Transducer ....................................................................................................... 39
Generator Frequency Less Than 10 Hertz .......................................................................................... 39
Power Supply Low ............................................................................................................................... 39
Loss of Field (40Q) .............................................................................................................................. 39
Field Overtemperature ......................................................................................................................... 40
Volts per Hertz (24) .............................................................................................................................. 40
Exciter Diode Monitor (EDM) ............................................................................................................... 42
Voltage / Current Unbalance Detection ............................................................................................... 43
Limiter Functions ..................................................................................................................................... 43
Stator Current Limiter .......................................................................................................................... 44
Overexcitation Limiter .......................................................................................................................... 44
Underexcitation Limiter ........................................................................................................................ 46
Underfrequency Limiter ....................................................................................................................... 47
Volts per Hertz Limiter ......................................................................................................................... 48
Var Limiter ............................................................................................................................................ 49
Limiter Scaling ..................................................................................................................................... 49
Operation with Paralleled Generators ..................................................................................................... 49
Droop Compensation ........................................................................................................................... 49
Reactive Differential ............................................................................................................................. 49
Line Drop Compensation ..................................................................................................................... 49
Autotracking ............................................................................................................................................. 50
Between DECS-400 Operating Modes ................................................................................................ 50
Between DECS-400 Units ................................................................................................................... 50
Data Recording and Reporting ................................................................................................................ 50
Sequence of Events ............................................................................................................................. 50
Data Logging ........................................................................................................................................ 51
Trending ............................................................................................................................................... 52
Power System Stabilizer.......................................................................................................................... 52
PSS Theory of Operation ..................................................................................................................... 53
Contents
DECS-400