1-2 General Information DECS-200
• Three communication ports
o Front RS-232 port for communication with a PC using BESTCOMS software
o Right-side panel RS-232 port for dedicated communication with a redundant DECS-200
o RS-485 communication port for communication with a remote terminal
• Modbus protocol for the RS-485 port allows communication at distances of up to 1,200 meters
(3,937 feet)
APPLICATION
Introduction
In the typical application shown in Figure 1-1, the DECS-200 controls the exciter field of a synchronous
generator. Front panel controls, indicators and serial communication ports using PC software make the
system easy to operate locally or from remote locations. DECS-200 operation, settings and safety setup
procedures in this manual should be studied before implementing your application. For detailed
application assistance, contact Basler Electric or your local sales representative.
Figure 1-1. Block Diagram of Typical DECS-200 Application
Operating Power
Operating power for the pulse-width modulated (PWM) excitation output is typically obtained from the
generator output through a power transformer. Alternately, operating power can be supplied from a
permanent magnet generator (PMG).
Control Power
If power supply option C (120/125 Vac/Vdc) is selected, a redundant power source can be used with the
DECS-200. (See Figure 1-1.) In this configuration, if one of the two sources fails, the other source will
continue to supply DECS-200 operating power. If power supply option L (24/48 Vdc) is selected, no
redundant power source is available.
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