DECS-200 Digital Excitation Control System DECS-200 Digital Excitation Control System One DECS-200 Digital Excitation Control System can accommodate 32Vdc, 63Vdc, or 125Vdc applications up to 15Adc. This unique flexibility provides precision control of generators of virtually any size. The DECS-200 also incorporates a pulse width modulated power stage, which improves system performances in non-linear load applications. FEATURES • Microprocessor-based design • True RMS sensing, single or three phase • 32Vdc, 63Vdc, and 125Vdc outputs at 15Adc • 0.25% Voltage Regulation Accuracy ® DESCRIPTION and • Setup from front panel HMI or by PC with Windows setup software included • 20 standard stability selections SPECIFICATIONS • User customizable stability selection Pages 2 through 5 • Paralleling compensation • Underfrequency compensation or V/Hz Ratio Limiter • Soft start buildup FEATURES and • Field Current Regulation Mode (Manual Mode) • Autotracking between operating modes and between DECS-200 units FUNCTIONS (optional) Pages 6 and 7 • Minimum Excitation Limiter (Internally generated or customizable) • On and off-line Maximum Excitation Limiters • Stator Current Limiter INTERCONNECT • Var and Power Factor Controllers • Exciter Diode Monitoring (EDM) DIAGRAM • Sequence of Events Recording Page 8 • Oscillography (continued on next page) FRONT, SIDE VIEWS ® and DIMENSIONS WINDOWS SOFTWARE Pages 9 through 11 Interface for setting and communicating with Basler products Request DECS-200-CD ORDERING ADDITIONAL INFORMATION Page 12 INSTRUCTION MANUAL Request Publication 9360100990 SZM-8 6-04 P. O. BOX 269 HIGHLAND, ILLINOIS, U.S.A. 62249 PHONE 618-654-2341 FAX 618-654-2351 DECS-200 Digital Excitation Control System FEATURES, continued • Remote set point control via: • Voltage Matching - Contact inputs • Eight (8) generator protection features - Proportional control via ±10Vdc or 4-20mA • Programmable output contacts - Communications inputs RS-232 (ASCII) or RS-485 • Front panel backlit LCD display (Modbus™) • Front panel mounted RS-232 and side RS-485 • Meets C37.90.1-1989 for Surge Withstand and Fast communications ports Transient • Modbus™ protocol for RS-485 input allows • UL recognized, CSA certified, CE compliant communications up to 4000 feet away • U.S. Patent Number 5,294,879 • <1% metering accuracy for 12 generator parameters DESCRIPTION cation, permitting autofollowing and transfer between The microprocessor based DECS-200 is a total DECS-200 units. It can also communicate to a PC via excitation control system in one enclosure. It contains the front panel RS-232 port for local programming and all the functionality necessary to limit, control, and metering, and it can communicate via Modbus™ protect a generator from operating outside of the protocol via the side RS-485 port for communications machine's capability. An optional feature of DECS- up to 4000 feet away from the DECS-200 unit. The 200's sophisticated design allows the nonactive DECS-200 has all the features, functionality, flexibility control mode within the unit to follow the active mode, and programmability expected from a state-of-the-art permitting bumpless transfer between modes. The microprocessor based product. optional software also allows for unit-to-unit communi- APPLICATIONS The DECS-200 is an excitation control system used to control the output voltage, vars or power factor of a synchronous generator by varying or controlling the amount of dc excitation applied to the generator's exciter field. The DECS-200 is suitable for virtually any size machine. SPECIFICATIONS INPUTS Control Power (style selectable) 16-60Vdc, Burden=30W. 85-132Vac, 50 or 60Hz, Burden=50VA. 90-150Vdc, Burden=30W. AC Operating Power 1 or 3 Phase Power Input DECS-200 Output AC Voltage Nominal Range (50-500Hz) Burden 32Vdc 60Vac 56-70Vac ±10% 780VA 63Vdc 120Vac 100-139Vac ±10% 1570VA 125Vdc 240Vac 190-277Vac ±10% 3070VA NOTE: To achieve the proper DECS-200 output voltage, the associated Operating Power must be provided. Minimum voltage buildup: 3 Vac. Generator Voltage Sensing Single-phase or three-phase line voltage, four ranges: • 100V/50Hz nominal (85 to 127V), 120V/60Hz nominal (94 to 153V) • 200V/50Hz nominal (170 to 254V), 240V/60Hz nominal (187 to 305V) • 400V/50Hz nominal (340 to 508V), 400V/60Hz nominal (374 to 600V) • 500V/50Hz nominal (425 to 625V), 600V/60Hz nominal (510 to 660V) Bus Voltage Sensing Single-phase line voltage (AC), four ranges: • 100V/50Hz nominal (85 to 127V), 120V/60Hz nominal (94 to 153V) • 200V/50Hz nominal (170 to 254V), 240V/60Hz nominal (187 to 305V) • 400V/50Hz nominal (340 to 508V), 400V/60Hz nominal (374 to 600V) • 500V/50Hz nominal (425 to 625V), 600V/60Hz nominal (510 to 660V) 2 DECS-200 Digital Excitation Control System SPECIFICATIONS, continued Generator Current Sensing Two ac current sensing ranges and two channel (phase) inputs: • For metering and control: 1A and 5A. • For cross current compensation: 1A and 5A. Sensing Burden Voltage: Less than 1VA per phase. Current: Less than 1VA. Parallel Compensation: Less than 1VA. Contact Switching Inputs 11 contact switching inputs are supplied with 24Vdc to accommodate dry contacts. Contacts are as follows: • Start • Var/PF Enable • Stop • Pre-position • Secondary DECS Enabled (optional) • Raise Switch • Unit/Parallel Operation • Lower Switch • AVR Mode • Alarm Rest • FCR Mode Remote Set Point Control Two separate analog inputs for remote set point control. Typically used to accept (Accessory Input) a signal from a Power System Stabilizer. Select one from the configuration menu. • ±10Vdc • 4 to 20 milliamperes OUTPUTS DC OUTPUT POWER: One DECS-200 will accommodate 32, 63, and 125Vdc applications. DECS-200 DECS-200 DECS-200 Rated Continuous Field Voltage 32 Vdc 45 Vdc* 63 Vdc 90 Vdc* 125 Vdc 180 Vdc* Rated Continuous Field Current 15 Adc 15 Adc 15 Adc 15 Adc 15 Adc 15 Adc Rated 10 Second Forcing Voltage* 50 Vdc 75 Vdc* 100 Vdc 150 Vdc* 200 Vdc 300 Vdc* Rated 10 Second Forcing Current 30 Adc 30 Adc 30 Adc 30 Adc 30 Adc 30 Adc Minimum Field Resistance 2.13 Ohm 3.0 Ohm* 4.2 Ohm 6.0 Ohm* 8.3 Ohm 12.0 Ohm* NOTE: Above parameters with nominal RMS power input. *These areas indicate D.C. output levels that may be up to 50% greater than listed if: 1) 3 phase input power is used, or 2) Field current is significantly lower than that listed. Contact Output Ratings Make and Break Amps Contacts are as follows: 24Vdc 8.0 • Watchdog 48Vdc 0.7 • Start/Stop 125Vdc 0.2 • Relay #1 120/240Vac 10.0 • Relay #2 Carry Amps • Relay #3 24/48/125Vdc 8.0 120/240Vac 10.0 COMMUNICATION There are three communication ports, two RS-232 and one RS-485: COM0: RS-232, 9 pin, sub-D connector located on front panel and used to communicate with local computers. 1200 to 19200 baud, 8N1 full duplex, ASCII commands COM1: RS-232, 9 pin, sub-D connector located on right side panel and used to connect primary and backup DECS-200 units. Port is only used for optional autotracking. COM2: RS-485, located on left side panel and used to communicate with local or remote computers or other 3 devices. 1200 to 19200 baud, 8N1 half duplex, Modbus™ protocol DECS-200 Digital Excitation Control System SPECIFICATIONS, continued REGULATION ACCURACY AVR Mode: Voltage regulation equals ±0.25% over the load range at rated power factor and constant generator frequency. Steady state stability equals ±0.1% at a constant load and generator frequency. Temperature drift equals ±0.5% for 0 to 50°C temperature change. Underfrequency (volts/hertz) characteristic slope from 0 to 3.0 P.U. is adjustable in 0.1 P.U. increments. FCR Mode: Field current regulation equals ±1.0% of the nominal value for 10% of the bridge input voltage change or 20% of the field resistance change. var Mode: ±2.0% of the nominal VA rating at the rated frequency. PF Mode: ±0.02 PF in the set point PF for the real power between 10 and 100% at the rated frequency. (e.g. -set point PF=0.80, PF regulation is from 0.78 to 0.82 PF.) Internal autotracking(optional): ±0.5% of the nominal field voltage change when transferring. PARALLEL COMPENSATION Can use either reactive droop or reactive differential (cross-current) compen- sation. Adjustable from 0 to 30% of the rated generator voltage droop with optional 1 ampere or less or 5 amperes or less input. Line drop compensation uses this same parameter; however, it is adjustable from -30% to 0. FIELD OVERVOLTAGE PROTECTION Adjustable in increments of 1.0Vdc from 1.0 to 325Vdc rated output voltage with a 0.2 to a 0.2 to 30 second inverse time delay settable in increments of 0.1 second. FIELD OVERCURRENT PROTECTION Adjustable in increments of 0.1Adc steps of rated field current from 0 to 16Adc excitation current setting with an inverse time delay (ANSI C50.13). EXCITER DIODE MONITOR (EDM) The DECS-200's EDM can detect open and shorted diodes on brushless generators. To do this, the DECS-200 requires the user to input the number of generator poles and the number of exciter poles (both adjustable from 0 to 20 in increments of 2). The open and shorted diode ripple threshold is adjustable from 0 to 100% of field current. The open diode protection time delay is adjustable from 10 to 60 sec- onds, and the shorted diode protection time delay is adjustable from 5 to 30 seconds. GENERATOR UNDERVOLTAGE PROTECTION Adjustable in increments of 1Vac from 0 to 30kV sensing voltage setting with a 0.5 to 60 second time delay (ANSI C50.13) settable in increments of 0.1 sec. GENERATOR OVERVOLTAGE PROTECTION Adjustable in increments of 1Vac from 0 to 30kV sensing voltage with a 0.1 to 60 second time delay (ANSI C50.13) settable in increments of 0.1 second. GENERATOR LOSS OF FIELD PROTECTION Adjustable in increments of 1 kVar from 0 to 3,000Mvar, with a 0.1 to 9.9 second delay settable in increments of 0.1 second. LOSS OF SENSING The loss of sensing setting for both balanced and unbalanced generator voltage is adjust- able from 0 to 100% of nominal generator voltage. The protection delay is adjustable from 0 to 30 seconds in 0.1 increments. SOFT START Functional in AVR and FCR with an adjustable rate of 1 to 7200 seconds in one second increments. SUMMING POINT and TAKEOVER TYPE OVEREXCITATION LIMITING Limiter response time is less than three cycles. SUMMING POINT TYPE: On-Line High Current Level (instantaneous) set point adjustable from 0 to 30.0Adc in 0.1Adc increments. Limiting occurs for a time period ranging from 0 to 10 sec., settable in 1 sec. ncrements. Medium Current Level set point adjustable from 0 to 20Adc in 0.1Adc increments. Limiting occurs for a time period ranging from 0 to 120 seconds, settable in 1 sec. increments. Low Current Level set point adjustable from 0 to 15Adc in 0.1Adc increments. Limiting occurs indefinitely. 4 DECS-200 Digital Excitation Control System SPECIFICATIONS, continued Off-Line High Current Level (instantaneous) set point adjustable from 0 to 30Adc in 0.1Adc increments. Limiting occurs for a time period ranging from 0 to 10 seconds, settable in 1 second increments. Low Current Level set point adjustable from 0 to 15Adc in 0.1Adc increments. Limiting occurs indefinitely. 2 TAKEOVER TYPE OEL: The Takeover OEL uses an I t characteristic. On-Line High Level: High Current Level (instantaneous) set point is adjustable from 0 to 30.0Adc in 0.1 Adc increments. Low Level: Low Current set point is adjustable from 0 to 15.0Adc in 0.1Adc increments. Limint occurs indefinitely. Time Dial - This setting determines the inverse time curve selected. Off-Line High Level - High current level (instantaneous) set point is adjustable from 0 to 30.0Adc in 0.1Adc increments. Low Level - Low current set point is adjustable from 0 to 15.0Adc in 0.1Adc increments. Limiting occurs indefinitely. Time Dial - This setting determines the inverse time curve selected. UNDEREXCITATION LIMITING Adjustments based on generator ratings. STATOR CURRENT LIMITING High Level - High current level set point adjustable from 0 to 60,000Aac in 0.1Aac increments. Limiting occurs for a time period ranging from 0 to 60 seconds, settable in 0.1 sec. increments. Low Level - Low current level set point adjustable from 0 to 60,000Aac in 0.1Aac increments. Limiting occurs indefinitely. SEQUENCE OF EVENT RECORDING (SER) 127 event reports stored in volatile memory (retrievable via BESTCOMS). SER triggered by: Input/Output status changes, system operating status changes, and alarm annunciations. OSCILLOGRAPHY Stores 8 records. Up to 6 variables can be logged in a record. Sampling rate: 600 data points per log, pre-trigger adjustable from 0 to 599 data points, 4ms to 10sec intervals between data points (2.4sec to 6000sec. total log duration) MANUAL EXCITATION CONTROL Regulates field current from 0 to 15.0A in increments of 0.1Adc. VOLTAGE MATCHING Matches utility bus RMS voltage with generator output RMS voltage within ±0.15% of the generator voltage REAL TIME CLOCK Time displayed in either 12 hour or 24 hour format and can be selected to allow for daylight savings timer. The date is selectable for two formats: d-m-y or m/d/y. Requires control power to operate. If power is lost, the clock will need to be reset. SURGE WITHSTAND CAPABILITY (SWC) IEEE C37.90.1-1989 FAST TRANSIENT IEEE C37.90.1-1989 HIGH POT. IEEE 421.3 ENVIRONMENTAL Operating temperature: -40°C to +60°C (-40°F to +140°F) Storage temperature: -40°C to +85°C (-40°F to +185°F) Salt Fog Per MIL-STD-810E, Method 509.3 (100 hrs. of salt fog, 100 hours of drying time) Shock 15 Gs in each of three mutually perpendicular planes Vibration 5-26Hz: 1.2Gs; 27-52Hz: 0.914mm (.036 inch) double amplitude; 53-500Hz: 5.0Gs Size 8.08" (205mm) wide x 6.76" (171mm) deep x 12.0" (304mm) high Weight 14 lbs. (6.35kg) AGENCY UL recognized per Std. 508; UL file number E90735; CSA certified per Std. CAN/CSA-C22.2, Number 14, CSA file number LR23131; CE compliant, EMC and LVD 5 DECS-200 Digital Excitation Control System FEATURES/FUNCTIONS input can be provided from other controlling devices such as a Voltage Regulation power system stabilizer. These devices modify the operation of The DECS-200 regulates the generator RMS voltage to within the DECS-200 to meet specific operating characteristics and 0.25% from no-load to full-load. It does this by utilizing digital requirements for the machine under DECS-200 control. Two signal processing and precise regulation algorithms developed more methods of set point control may be achieved via the RS- by Basler Electric, utilizing the experience gained in many years ® 232 communication port by using the Windows based PC of manufacturing tens of thousands of digital voltage regulators. software or by the RS-485 port using Modbus™ protocol. Regardless of which method of set point is used (contact inputs, Stability auxiliary input or communications with a PC or PLC), traverse The DECS-200 utilizes proportional (P), integral (I) and deriva- rates of all modes of operation are independently adjustable. tive (D) stability control. DECS-200 has 20 preprogrammed This means an operator can customize the rate of adjustment stability (PID) settings for exciter field applications. This means and "feel" to meet his/her needs. that a standard stability setting is already available for most applications/machines. The DECS-200 has a stability range that Pre-position Inputs allows for customizing the stability settings to fine tune the DECS-200 provides the added flexibility of allowing a predeter- stability to provide optimum customized generator transient mined operating point for each mode of operation. With a performance. Setup software contains PID selection program to contact input to the DECS-200, the operating mode is driven to assist in determining the correct PID settings. The DECS-200 an operating or regulation level assigned to that operation mode provides for customizing the stability and transient performance by the operator or user. The pre-position inputs operate in one of of the Min/Max Excitation Limiter and var/PF controllers by two modes, Maintain or Release. The Maintain mode prevents providing additional stability adjustments. adjustment of the setpoint as long as the pre-position contact is closed. The release mode allows adjustment of the setpoint even Underfrequency Limiter or V/Hz Ratio Limiter though the pre-position is closed. This feature allows the DECS- DECS-200 is selectable for either Underfrequency Limiter or a 200 to be configured for specific system and application needs. V/Hz Ratio Limiter function. The underfrequency limiter slope can be tuned to have 0 to 3 times p.u. Volts/Hz, in 0.1Hz Field Current Regulation Operating Mode increments, and the corner frequency roll-off point can be set DECS-200 provides a manual channel of operation called Field across a range of 45 to 65Hz, in 0.1Hz increments. This Current Regulation, or FCR, Mode. In this mode, DECS-200 adjustability allows the DECS-200 to precisely match the regulates the field current generated by the internal PWM power operating characteristics of the prime mover and the loads stage. It does not rely on the sensing input to DECS-200 and is, being applied to the generator. The Volts/Hz Ratio Limiter therefore, a good source of backup excitation control when loss clamps the regulation set point to prevent operation above a V/ of sensing is detected. In this mode, control of the generator is Hz level that is prescribed by the slope of the DECS-200. This totally dependent upon the operator to maintain nominal feature is also useful for other potentially damaging system generator voltage as the load varies on the generator. conditions such as a change in system voltage and re-duced frequency situations that exceed the V/Hz ratio. Var/Power Factor Controller Operating Mode DECS-200 has, as another standard feature, two modes of Soft Start Voltage Buildup operation when the generator is in parallel with the utility power Generator voltage overshoot can be harmful to the generator's grid. The DECS-200 has both var and PF modes of operation. insulation system if not controlled. DECS-200 has a soft start When the generator is in parallel with the utility grid, the DECS- feature with a user-adjustable setting to govern the rate at which 200 can regulate the var output of the generator to a specific var the generator voltage is allowed to build up. This prevents the level magnitude or it can vary the var output of the generator to generator voltage from overshooting nominal voltage levels maintain a specific power factor as the kW load varies on the during startup of the generator system. generator. Paralleling Compensation Maximum Excitation Limiters DECS-200 has provisions to parallel two or more generators Overexcitation limiting (OEL) operates in all modes except FCR using reactive droop or reactive differential compensation with mode. OEL senses the field current output of the voltage the addition of an external current transformer with secondary regulator or static exciter and limits the field current to prevent currents of 1 or 5Aac. The current input is rated at less than field overheating. In FCR mode, the DECS-300 only announces 1VA. This low burden means that existing metering CTs can be that all conditions for OEL are fulfilled and does not provide used and dedicated CTs are not required. limiting. The DECS-200 provides two types of overexcitation: Summing Point and Takeover. Set Point Control DECS-200 has means for external set point adjustment of the Summing Point Type OEL controlling mode of operation. This eliminates the need for Three OEL current levels are defined for on-line operation. They additional equipment like motor operated potentiometers for are high, medium, and low. The generator can operate continu- remote control or multiple point control for the excitation ously at the low OEL current level and for programmed times at system. The operating mode's set point may be directly the high and medium OEL current levels. Two OEL current levels controlled by raise/lower contact inputs, auxiliary inputs of 4- are defined for off-line (main breaker open) operation. They are 20mA or ±10Vdc. The auxiliary input adjusts the operating high and low. The generator can operate continuously at the low mode across its predetermined adjustment range. The auxiliary OEL current level and for a programmed time at the high OEL 6 current level. DECS-200 Digital Excitation Control System FEATURES/FUNCTIONS, continued Takeover Type OEL Sequence of Events Recording (SER) The field current level at which limiting occurs is determined by A sequence of event report (SER) is a very powerful tool when an inverse time characteristic. Two current levels and a time dial reconstructing the exact timing of an event or disturbance. The setting are defined for the takeover-style OEL limiter. Separate DECS-200 monitors its contact inputs and outputs for a change curves may be selected for on-line and off-line operation. If the of state, system operation changes, and alarm conditions. If any system enters an overexcitation condition, the field current is of these events occurs, the DECS-200 will log that event with a limited and made to follow the selected curve. The selection of date and time stamp. Date and time stamping of the event allows on-line or off-line OEL levels/curves is determined by an OEL the user to recreate a chain of events in the sequence in which option selection. they occurred. The DECS-200 can store 127 events in volatile memory, and those events are retrievable using BESTCOMS. Minimum Excitation Limiter The minimum excitation limiter limits the amount of excitation Oscillography (See Figure 6) supplied to the field of the generator from dropping below The data recording feature can record up to eight (8) oscillo- unsafe operating levels. This prevents the machine from possibly graphic records stored in volatile memory. The user can select slipping poles and from damaging the machine. It limits the up to six (6) variables to be monitored when triggered by the amount of vars being absorbed by the machine, based on user- DECS-200 BESTCOMS, a Logic Trigger, or a Level Trigger. definable settings. An internally generated Underexcitation Variables that can be selected are: generator voltage, current Limiting (UEL) curve can be utilized based on a var level at 0kW, (single phase), frequency, kW, Power Factor, exciter field or a customizable 5 point UEL curve can be selected to match voltage, and current. specific generator characteristics. The user can utilize the DECS-200 BESTCOMS to trigger and save a record of a voltage step response during commissioning. Stator Current Limiter Once commissioned, a logic trigger or level trigger can be used to activate the data recorder to capture the occurrence for The stator current limiter (SCL) senses the level of stator current and limits it to prevent stator overheating. The SCL operates in review at a later time. DECS-200 alarms can also be used to start the data recorder. When an alarm condition occurs, an oscillo- all modes except FCR. In FCR mode, the DECS-200 only announces that a stator overcurrent condition exists; it does not graphic record can be stored. A level trigger will initiate a record to be saved when a variable exceeds a predetermined setting. provide current limiting. Two SCL current levels are provided: high and low. The generator can operate continuously at the low An example of this is when the exciter field current exceeds a predetermined setting. SCL level but only for a programmed time at the high SCL level. The oscillographic records are recorded in accordance with the Internal Autotracking Between DECS-200 Operating IEEE Standard Common Format for Transient Data Exchange Modes (COMTRADE). Basler Electric can provide BESTWAVE, a DECS-200 is an intelligent device that can provide autotracking COMTRADE viewer, which is a program that will allow the user (autofollowing) of the controlling mode by the non-controlling to view the oscillography records saved by the DECS-200. modes. This allows the operator to initiate a controlled, bumpless transfer of the DECS-200 operating modes, causing Communications minimum amounts of line disturbance for the power system. This ® DECS-200 comes complete with Windows based PC software. feature can be used in conjunction with a set of protective relays This software makes the programming and customization of the to initiate a transfer to a backup mode of operation, such as FCR DECS-200 easy and fast. The software comes with a PID mode, upon the detection of a system failure or fault, i.e., loss of selection program that allows the user to select stability settings sensing. quickly and easily in a user-friendly format. The PC software has a special monitoring function that allows the user to view all External Autotracking between Dual DECS-200 Units settings, a metering screen for viewing all machine parameters, (Optional) and a control screen for remote control of the excitation system. A DECS-200 can also follow (autotrack) a second DECS-200 unit. The second DECS-200 is put into a specific operating mode The RS-485 port supports Modbus™ communications protocol. and follows the excitation level of the first. In the unlikely event of This is an open protocol with all registers and operating a failure of the first DECS-200, protective relays can initiate a instructions available in the instruction manual, to make it simple transfer of control from the first to the second DECS-200. for the user to develop custom communications software. Protective Functions Password Protection There are several protection functions built into the DECS-200 All DECS-200 parameters are viewable via the front panel LCD unit. These functions may be used as backup to the primary display, the PC software or via Modbus™ without the need of a protection relays and can be assigned programmable output password. If the user wishes to change a setting, the proper contacts via the PC software. The protection features offer fully password must be entered to allow access to the parameter. adjustable tripping levels and time delays. The protective Two levels of password protection exist, one for global access of features are as follows: all parameters and one for a limited amount of access to • Generator Overvoltage • Watchdog Timer parameters normally associated with operator control. • Generator Undervoltage • Loss of Sensing • Field Overvoltage • Loss of field • Field Overcurrent • EDM Exciter Diode Monitor 7 DECS-200 Digital Excitation Control System CONNECTIONS Figure 1 - Typical AC Connection Diagram 8 DECS-200 Digital Excitation Control System FRONT and SIDE PANEL VIEWS The front panel HMI (Human Machine Interface) is composed of several elements, including a backlit LCD screen, six (6) pushbuttons and six (6) LEDs. The LCD is the primary interface because it conveys the majority of the information between the DECS-200 and the user/operator. Front panel pushbuttons allow the user to view menu screens and modify the various screen settings and operating conditions. The LEDs annunciate their respective states. A) 64x128 pixel graphic LCD with backlighting. Primary source for receiving information from the DECS or when locally programming settings. Displays operations, set points, loop gains, metering, protection functions, system parameters and general settings. B) Pre-Position LED – Turns ON at the predefined setting (within the limits of the setpoints) of the current mode. C) Lower Limit LED – Turns ON at the minimum set point value of the current (active) mode. D) Upper Limit LED – Turns ON at the maximum set point value of the current mode. E) Scrolling Pushbuttons – Scrolls UP/DOWN/LEFT/RIGHT through the menu tree or when in the EDIT mode, the LEFT/RIGHT scrolling pushbuttons select the variable to change and the UP/DOWN scrolling pushbuttons change the variable. F) Reset Pushbutton – Cancels editing sessions and can be used as a quick-access to the metering screen. G) Serial Port COM0 – D-type 9 pin connector. This port is dedicated to RS-232 (ASCII commands) communication with a computer terminal or PC running a terminal emulation program such as BESTCOMS™. H) Edit Pushbutton – Enables settings changes. When the EDIT pushbutton is first pushed, an LED on the pushbutton turns ON to indicate the edit mode is active. When changes are complete (using the scrolling pushbuttons) and the EDIT pushbutton is pushed again, the LED turns OFF, indicating the changes are saved. If changes are not completed and saved within five minutes, the edit mode is exited without saving changes. I) Null Balance LED – Turns ON when the inactive modes (AVR, FCR, var, or PF) match the active mode. J) Internal tracking LED – All inactive modes (AVR, FCR, var, or PF) track the active mode to accomplish the bumpless transfer when changing active modes. Figure 2 - Side Panel View 9 DECS-200 Digital Excitation Control System DIMENSIONS Front view Top view Figure 3 - Dimensions 10 DECS-200 Digital Excitation Control System ACCESSORIES • Front panel mounting bracket, Basler P/N 9360107100. See Figure 4. • Interconnection cable for dual DECS-200 applications, Basler P/N 9310300032. • Control Power Isolation Transformer, Basler P/N BE31449-001. Isolation required on AC control power input when dual control power sources are used. • DECS Freewheeling Diode Module required in dual DECS-200 applications, Basler P/N 9293600101. • Inrush Current Reduction Module required when operating power of the DECS-200 is fed via a station service source. • The RDP-300 Remote Display Panel is a human-machine interface (HMI) used with a single or dual DECS-200 to provide remote control, to view metered quantities, and to provide annunciation of digital controller status and alarms. The RDP- 300 uses a touch-sensitive six inch diagonal monitoring screen with RS-485 Modbus communication protocol, which may be located up to 4000 feet away from the DECS-200 controller(s). Figure 4 - Front Panel Mounting Bracket, P/N 9360107100 Figure 5 - Front Panel Cutout Dimensions (Requires mounting bracket shown in Figure 4.) 11 R e g i O s DECS-200 Digital Excitation Control System Figure 6 - BESTwave Oscillography HOW TO ORDER ® Highland, IL: ISO 9001 Wasselonne, France: ISO 9001 Taylor, TX: ISO 9001 P .A.E. Les Pins, 67319 Wasselonne Cedex FRANCE Route 143, Box 269, Highland, Illinois U.S.A. 62249 1300 North Zhongshan Road, Wujiang Economic Development Zone Tel +33 3.88.87.1010 Fax +33 3.88.87.0808 Tel +1 618.654.2341 Fax +1 618.654.2351 Suzhou, Jiangsu Province, PRC 215200 e-mail: beifrance@basler.com e-mail: info@basler.com Tel +86(0)512 6346 1730 Fax +86(0)512 6346 1760 e-mail: beichina@basler.com www.basler.com S t e I r Quality System e d Basler