KR-FF, KR-FFMX Static Voltage Regulators CLASS 300 EQUIPMENT KR-FF, KR-FFMX STATIC VOLTAGE REGULATORS DEVICE NUMBER 90 APPLICATIONS: The KR-FF and KR-FFMX static voltage regulators provide precise generator line voltage regulation. They are suitable for use with small and medium size generators using brush or brushless rotary exciters. The KR-FF and KR-FFMX series of regulators also provides underfrequency protection and contains built-in suppression for conducted EMI. DESCRIPTION: The KR series of regulators provides field excitation voltages of 32, 63, and 125 Vdc for 50/60 Hz generators to maintain the generator line voltage within a tight regulation band. Sensing voltage selection is accomplished using easily accessible, Faston terminals. FEATURES AND All KR voltage regulators utilize thyristors in the power stage. They employ built-in electromagnetic interference (EMI) suppression to reduce the conducted interference generated by the thyristors. APPLICATIONS Figure 4 provides details on the levels of EMI suppression. this page Selection of 50 Hz or 60 Hz underfrequency protection is easily accomplished through the use of Faston terminals. *Although the underfrequency operational threshold is normally factory preset at a nominal 6.0 Hz below the system frequency. The percentage of generator output voltage obtained for a specific reduction in frequency is illustrated in Figures 2 and 3. SPECIFICATIONS ELECTRICAL AND PHYSICAL A full line of accessories is available for use with the KR regulators, enabling the user to meet other system requirements including excitation support, paralleling, and manual voltage control. These page 2 accessory items are described on page 3. KR-FFMX: The KR-FFMX regulators are designed to operate in a high humidity environment. Although similar to the KR-FF, the KR-FFMX utilizes hermetically sealed components, moisture ACCESSORIES resistant sealed transformer, sealed potentiometers and urethane coated printed circuit board and wire connections. * Unit is shipped connected for 60 Hz operation. page 3 FEATURES: • Regulation accuracy better than ±1%. DIMENSIONS AND  Applicable to either 50 Hz or 60 Hz generators. INTERCONNECT  EMI suppressed.  Built-in underfrequency protection for voltage regulator and generator system. page 4  Moisture resistant (KR-FFMX only).  Adjustable stabilization network.  Externally adjustable voltage range.  Internal “build-up” circuits. INSTRUCTION MANUALS  Solderless reconnectable Faston terminals facilitate selection of sensing voltage and frequency Reference Publication Number (50 Hz or 60 Hz). 9 1606 00 991 (KR4FFX/FFMX, KR7FFX/FFMX)  Mechanically rugged, welded steel chassis. 9 1160 00 99X (KR2F/FM, KR2FF/FFM, KR4F/FM, KR4FF/FFM,  Compact, reliable, economical. KR7F/FM, KR7FF/FFM)  Complete accessory line available.  CSA approved. ROUTE 143, BOX 269 HIGHLAND, ILLINOIS 62249, U.S.A. PHONE 618-654-2341 FAX 618-654-2351 SD-15 2-97 KR-FF, KR-FFMX Static Voltage Regulators SPECIFICATIONS: OPERATING TEMPERATURE RANGE: -40°C (-40°F) to +60°C (+140°F). OUTPUT POWER: See Table 1. STORAGE TEMPERATURE RANGE: -65°C (-85°F) to MINIMUM FIELD RESISTANCE: See Table 1. +85°C (+185°F). MAXIMUM FIELD RESISTANCE: See Table 1. POWER DISSIPATION: Less than 20 watts at maxi- INPUT POWER: mum continuous rating. Voltage: See Table 1. SHOCK: Withstands up to 20 Gs in each of three mutually perpendicular planes. Frequency: 50/60 Hertz VIBRATION: Withstands 5 to 26 Hz @ 1.2 G’s; 27 to 52 Phase: Single Hz @ .036 double amplitude; 53 to 260 Hz @ 5.0 G’s. Burden: See Table 1. DIMENSIONS: 7.125” (180.975 mm) x 7.100” (180.34 INPUT SENSING: mm) x 3.937” (99.999 mm). Voltage 120-139/208-240/416-480/520-600 Vac FINISH: Chassis zinc coated per MIL-Z-325A, type II, ±10% (60 Hz) class 2; circuit board epoxy conformal coated. 100-110/220-230-240/380-400-415/500 WEIGHT: 6.0 pounds (2.718 kg) net; 7.0 pounds Vac ±10% (50 Hz) (3.171 kg) shipping. Phase: Single Burden (maximum): 10VA TABLE 1. VOLTAGE ADJUST RANGE: Minimum ±10% of nominal voltage. REGULATION ACCURACY: ±1% maximum over full range of generator loading and 5% frequency variation. REGULATOR RESPONSE: Less than 17 milliseconds. REGULATOR DRIFT: Less than 1% over a 40°C (72°F) ambient temperature change. REGULATOR SENSING: Single phase average voltage. UNDERFREQUENCY OPERATIONAL THRESHOLD (KR-FF/FFM SERIES ONLY): 44 Hz nominal in 50 Hz systems. See Figure 2. * If correct voltage is not available, a suitable power transformer must be selected. 54 Hz nominal in 60 Hz systems. See Figure 3. ** The halfwave output of these regulators requires the use of an airgap isolation transformer (when a transformer is required). EMI SUPPRESSION: See Figure 4. *** All voltage ranges in Vac ±10%. **** Voltage forcing ratings are based upon the following power inputs: KR2FF, KR4FFMX - 120 Vac; KR7FFMX - 240 Vac. Operation with power inputs other than these will result in a proportional increase or decrease in voltage forcing. FIGURE 2. Voltage-Frequency Characteristic FIGURE 3. Voltage-Frequency Characteristic Curve for 50 Hertz System* Curve for 60 Hertz System* *Limits of the operational envelope (shaded area) are primarily a function of operational temperature and normal tolerances in components. 2 KR-FF, KR-FFMX Static Voltage Regulators * Shaded area is a composite of the EMI suppression for all 50/60 Hz models. FIGURE 4. TYPICAL SUPPRESSION OF CONDUCTED EMI. STANDARD ACCESSORIES AVAILABLE FROM STOCK POWER ISOLATION TRANSFORMERS: Basler Electric sensing signal, the Paralleling Module is capable of compen- power isolation transformers are designed specifically for sation by either the reactive droop or the reactive differential use with these voltage regulators and power generating (cross-current) method. Detailed description is given in the systems. See complete power isolation transformer infor- APM300 Paralleling Module Bulletin (SPI). A complete line of mation in Power Isolation Transformer Bulletin (SP). Paralleling Current Transformers for use with the APM300 is also available. See Current Transformer Bulletin (SPB). EXCITATION SUPPORT SYSTEM (Series Boost Option): Many applications require the support of higher than nor- MANUAL VOLTAGE CONTROL: Basler Manual Voltage mal output currents for either motor starting (inrush) or Control (MVC) Modules are for use with the regulators in selective breaker tripping under fault conditions. The Basler brushless exciter applications. These modules make use of a patented Excitation Support System (U.S. Patent No. three-position switch to allow the generator voltage to be 3,316,479) is an all static device which provides the regu- controlled either manually or automatically, and also to pro- lator with a relatively constant input voltage from both the vide the means for system voltage shutdown. See MVC generator output voltage and current. Power current trans- Module Bulletin (SRK). formers are available for virtually all generator-exciter- MOTOR OPERATED CONTROL: Basler’s MOC2-Series of regulator combinations. See Excitation Support System Motor Operated Potentiometers provides remote, multipoint Bulletin (SP) for additional information. adjustment of generator voltage in a wide range of resistance PARALLELING MODULE: For applications involving mul- values. These controls operate on either AC or DC power at tiple units, the Basler APM300 Paralleling Module provides voltages of 24, 32, 48 or 125 volts. See Motor Operated reactive load division control for the regulators. By isolating Control Bulletin (SRA). the current signal before combining it with the voltage NON-STANDARD ACCESSORIES AVAILABLE ON SPECIAL ORDER The following non-standard accessories are available for use with Regulators in specific applications. Consult the factory for more information:  WIDE RANGE VOLTAGE ADJUST MODULE  VOLTS/HERTZ SENSING MODULES  DC SENSING MODELS 3 KR-FF, KR-FFMX Static Voltage Regulators HOW TO ORDER: Refer to the Output Power portion of Table 1 and load, and for 5% frequency variation. The regulator shall locate the appropriate ratings for your application. be a solid state device employing SCR’s in the power Order the regulator in the “Model” column, opposite control stage. It shall have built-in electromagnetic the selected ratings. interference suppression and built-in underfrequency control for 50/60 Hz operation. The regulator shall be capable of ±10% adjustment of generator output voltage. SAMPLE SPECIFICATION: The voltage regulator shall control the exciter field to maintain the generator output voltage within ±1% for The voltage regulator shall be a Basler Electric Company all steady state load conditions from no load to full type KR-FF or KR-FFMX or equivalent. NOTES: All dimensions are in inches (millimeters). FIGURE 5. OUTLINE DRAWING. FIGURE 6. TYPICAL INTERCONNECTION. ROUTE 143, BOX 269, HIGHLAND, ILLINOIS U.S.A. 62249 P.A.E. Les Pins, 67319 Wasselonne Cedex FRANCE 4 PHONE 618-654-2341 FAX 618-654-2351 PHONE (33-3-88) 87-1010 FAX (33-3-88) 87-0808 http://www.basler.com, info@basler.com