Basler Electric DECS-400 - Manual (Page 43)

9369700990 Rev R 31
Input resistance is nonlinear and approximately 4 k
Ω at 3.5 Vdc and 3 kΩ at 20 Vdc. IRIG signal
connections are made at terminals D1 (IRIG+) and D2 (IRIG–).
Memory Circuits
The DECS-400 has three types of memory circuits: flash memory, random access memory (RAM), and
electrically-erasable, programmable, read-only memory (EEPROM). Flash memory is nonvolatile and
retains the operating software (firmware). RAM is volatile and serves as temporary storage for data.
EEPROM is nonvolatile and stores DECS-400 settings.
Digital to Analog Converter
Digital input data from the digital signal processor (DSP) is converted by the digital-to-analog converter
(DAC) into analog signals for controlling the excitation level. Output data from the DAC may be either a
voltage signal or current signal. Signal selection is made through BESTCOMS or the front panel HMI.
A second pair of DACs supply metering signals to the DECS-400 meter driver output terminals.
Control Output Circuits
Analog signals from the DAC are output to switches controlled by the DSP. There are three control signal
options. A control signal over the range of 0 to 10 Vdc, –10 to 10 Vdc, or 4 to 20 mAdc may be selected.
Control signal selection is made through BESTCOMS or the front panel HMI.
Meter Driver Circuits
Two analog signals from a second DAC are output from the microprocessor. A meter driver signal over
the range of 4 to 20 mAdc may be configured to represent one of the DECS-400 metered values. Each
driver circuit can be configured for a different metered value and configured to represent a specific range
of the metered value. The parameters available for metering are listed below:
•
Auxiliary Voltage Input
•
AVR PID Error Signal Input
•
Bus Frequency
•
Bus Voltage
•
Comp. Freq. Deviation
•
Control Output
•
Cross Current Input
•
Field Current
•
Field Temperature
•
Field Voltage
•
Frequency Response
•
Generator Apparent Power
•
Generator Average Current
•
Generator Average Voltage
•
Generator Current Ia
•
Generator Current Ib
•
Generator Current Ic
•
Generator Frequency
•
Generator Power Factor
•
Generator Reactive Power
•
Generator Real Power
•
Generator Voltage Vab
•
Generator Voltage Vbc
•
Generator Voltage Vca
•
Negative Sequence Current
•
Neg. Sequence Voltage
•
Null Balance Level
•
OEL Controller Output
•
PF Mode Output
•
Phase Angle Ia – Vca
•
Phase Angle Iaux – Vca
•
Phase Angle Ib – Vca
•
Phase Angle Ic – Vca
•
Phase Angle Vab
•
Phase Angle Vbc
•
PID Integrator State
•
Position Indication
•
Positive Sequence Current
•
Positive Sequence Voltage
•
PSS Electrical Power
•
PSS Filtered Mech. Power
•
PSS Final Output
•
PSS Lead-Lag #1
•
PSS Lead-Lag #2
•
PSS Lead-Lag #3
•
PSS Lead-Lag #4
•
PSS Mechanical Power
•
PSS Mech. Power LP #1
•
PSS Mech. Power LP #2
•
PSS Mech. Power LP #3
•
PSS Mech. Power LP #4
•
PSS Post-Limit Output
•
PSS Power HP #1
•
PSS Pre-Limit Output
•
PSS Speed HP #1
•
PSS Synthesized Speed
•
PSS Terminal Voltage
•
PSS Torsional Filter #1
•
PSS Torsional Filter #2
•
PSS Washed Out Power
•
PSS Washed Out Speed
•
Rate of Frequency Change
•
SCL Controller Output
•
Terminal Freq. Deviation
•
Time Response
•
UEL Controller Output
•
Var Limiter Output
Relay Output Contacts
DECS-400 output contacts consist of a dedicated On/Off output, a dedicated Watchdog output, and six
programmable outputs.
DECS-400 Functional Description