1-2 9440300990
Introduction DECS-250
• IRIG or network time synchronization
• Sixteen contact sensing inputs
o Two fixed-function inputs: Start and Stop
o Fourteen programmable inputs
• Twelve contact outputs
o One, fixed-function output: Watchdog (SPDT configuration)
o Eleven programmable outputs
• Flexible communication
o Serial communication through front-panel USB port
o Modbus communication through RS-485 port or Modbus TCP
o Ethernet communication through an optional copper or fiber optic port
o CAN communication with an ECU (engine control unit), optional AEM-2020 Analog
Expansion Module, or optional CEM-2020 Contact Expansion Module
o Optional PROFIBUS communication protocol
• Data logging, sequence of events recording, and trending
• Optional CEM-2020 Contact Expansion Module provides:
o Ten contact inputs
o Eighteen contact outputs (CEM-2020H) or 24 contact outputs (CEM-2020)
o Customizable input and output functions assigned through BESTlogic™Plus
programmable logic
o Communication via CAN protocol
• Optional AEM-2020 Analog Expansion Module provides:
o Eight analog inputs
o Eight resistive thermocouple device (RTD) inputs
o Two thermocouple inputs
o Four analog outputs
o Customizable input and output functions assigned through BESTlogicPlus programmable
logic
o Communication via CAN protocol
Applications
The DECS-250 is intended for synchronous generator or synchronous motor applications. The DECS-250
controls the machine output through the application of regulated DC excitation power to the exciter field.
The level of excitation power is based on the monitored voltage and current, and a regulation setpoint
established by the user. The operating mode, generator or motor, is changed on the Operating Mode
settings screen. Power factor and var metering values will be opposite in motor mode.
Excitation power is supplied from the DECS-250 by means of a filtered, switching power module that uses
pulse-width modulation. It is capable of supplying 15 Adc (or 20 Adc up to 55°C (131°F)) continuously at a
nominal voltage of 32, 63, or 125 Vdc. With nominal operating power applied, it has a forcing capability of
30 Adc for 10 seconds.
Package
A single, compact package contains all excitation control and power components.
A front panel HMI provides local annunciation and control through a backlit liquid crystal display (LCD),
light-emitting diodes (LEDs), and pushbuttons. Remote annunciation and control is provided through a
flexible communication interface which accommodates Ethernet, Modbus, optional PROFIBUS, and the
optional Interactive Display Panel (IDP-801).
To Next Page
Loading...
