Basler Electric DECS-400 User Manual
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9369700990 Rev R
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Rate of Frequency Change Blocking ................................................................................................... 58
Field Isolation Module.............................................................................................................................. 58
Installation ............................................................................................................................................... 59
Installing BESTCOMS ......................................................................................................................... 59
Starting BESTCOMS ............................................................................................................................... 59
The BESTCOMS Interface .................................................................................................................. 59
Communication ........................................................................................................................................ 61
RS-232 Port Communication ............................................................................................................... 61
Ethernet Port Communication .............................................................................................................. 61
Modem Communication ....................................................................................................................... 63
Settings, Metering Values, and Data Records ........................................................................................ 63
System Configuration .......................................................................................................................... 63
Settings ................................................................................................................................................ 71
Gain Settings ....................................................................................................................................... 77
Limiters ................................................................................................................................................ 81
Protection ............................................................................................................................................. 88
PSS ...................................................................................................................................................... 93
Metering ............................................................................................................................................... 98
Data Log ............................................................................................................................................ 102
Analysis .............................................................................................................................................. 111
Logic .................................................................................................................................................. 120
DECS-300 Settings File Converter ........................................................................................................ 120
Mounting ................................................................................................................................................ 121
DECS-400 .......................................................................................................................................... 121
Field Isolation Module ........................................................................................................................ 121
Isolation Power Transformer .............................................................................................................. 121
Connections ........................................................................................................................................... 125
DECS-400 Terminations .................................................................................................................... 125
Field Isolation Module Terminations .................................................................................................. 127
DECS-400 Terminal Functions and Assignments ............................................................................. 127
Field Isolation Module Terminal Functions and Assignments ........................................................... 131
Cross-Current Compensation ............................................................................................................ 132
Typical Interconnections .................................................................................................................... 133
Communication Connections ............................................................................................................. 136
Preparation ............................................................................................................................................ 139
Record System Parameters ............................................................................................................... 139
Testing and Evaluation .......................................................................................................................... 139
Off-Line Tests—Turbine Not Spinning ............................................................................................... 139
Off-Line Tests—Turbine Spinning ..................................................................................................... 142
Excitation Performance Evaluation .................................................................................................... 145
Recommended PSS Testing ............................................................................................................. 147
Storage .................................................................................................................................................. 149
Warranty and Repair Service ................................................................................................................ 149
Troubleshooting ..................................................................................................................................... 149
DECS-400 Appears Inoperative ........................................................................................................ 149
Display Blank or Frozen ..................................................................................................................... 149
Generator Voltage Does Not Build .................................................................................................... 149
Generator Voltage Builds but DECS-400 Fails To Flash................................................................... 150
Field Voltage or Current Reading on LCD Does Not Change ........................................................... 150
Low Generator Voltage (In AVR Mode) ............................................................................................. 150
High Generator Voltage (In AVR Mode) ............................................................................................ 151
Generator Voltage Unstable (Hunting) .............................................................................................. 151
DECS-400
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