Basler DECS-150 User Manual

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DECS-150 Introduction
1 • Introduction
DECS-150 Digital Excitation Control Systems offer precise excitation control and machine protection in a
compact package. DECS-150 adaptability to many applications is assured through configurable contact
inputs and outputs, flexible communication capabilities, and programmable logic implemented with the
provided BESTCOMSPlus
®
software.
Applications
The DECS-150 is intended for brushless ac synchronous generator or synchronous motor applications.
The DECS-150 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-150 by means of a filtered, switching power module that uses
pulse-width modulation. It is capable of supplying 7 Adc (70°C ambient) continuously and 10 Adc (55°C
ambient) continuously at nominal voltages of 63 or 125 Vdc. With nominal operating voltage applied, it
has a forcing capability of 11 Adc for 10 seconds (70°C ambient) or 14 Adc for 10 seconds (55°C
ambient).
Features and Functions
DECS-150 features and functions include:
• Precise excitation control for synchronous generator or synchronous motor applications
o Power factor and var metering values will be opposite in motor mode
• Four excitation control modes:
o Automatic Voltage Regulation (AVR)
o Field Current Regulation (FCR)
o Power Factor Regulation (PF)
o Var Regulation (var)
• Three pre-position setpoints for each excitation control mode
• Internal tracking between operating mode setpoints and optional external tracking of a second
DECS excitation setpoint
• Two PID stability groups with Auto Tune feature
• Remote setpoint control input accepts analog voltage or current control signal
• Grid code functions
o Connect and disconnect
o Active power control
o Reactive power control
• Optional network load sharing
• Real-time metering
• Optional integrated power system stabilizer (PSS)
o Generator or motor control modes, accommodates phase rotation changes between modes
o Speed and power sensing or speed-only sensing
• Soft start and voltage buildup control
• Four limiting functions:
o Overexcitation: summing point and takeover
o Underexcitation
o Stator current
o Underfrequency
• Seventeen protection functions:
o Machine undervoltage (27)
o Machine overvoltage (59)
o Loss of sensing (LOS)

Basler DECS-150 Specifications

General

Brand	Basler
Model	DECS-150
Category	Control Systems
Language	English