X20101 UNITEDAUTOMATION | Alldatasheet
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PFC2 80kVAR and 100kVAR RANGE 2-Channel Power Factor Switch RoHS Compliant Sample Photo - PFC2-80KVAR. INTRODUCTION The PFC2 range of Capacitor switches provide optimised switching and control of three phase capacitive loads for Power Factor Correction, suitable for a three phase supply using the two-leg control technique. Signal control is by a DC signal. They incorporate an automatic resetting temperature trip fitted to the heatsink. They also have an integral semiconductor power fuses. The two models in this series include the 80kVAR and the 100kVAR models, both of which are fan cooled.
APPLICATIONS
The PFC2 controllers are suitable for 3-wire, 3-phase floating-star or closed-delta configured capacitive loads for Power Factor Correction and can be used in capacitor banks with or without chokes fitted. These power control stacks are designed to dramatically reduce the inrush current normally found with contactor based systems, They also allow for repetitive and rapid switching as there are no mechanical contacts to arc, and feature a controlled switch off to minimise flicker and eliminate RFI problems. These power switches could be used in places where rapid changes in Power Factor could be seen such as welding plants, lifts, cranes and wind powered plants. FUNCTION Operation These solid state capacitor switches are comprised of two anti-parallel thyristor diode modules with appropriate transient protection connected across them. These modules are mounted on a heat sink and are controlled by a microprocessor based trigger module which determines the precise time to trigger the thyristor so as to eliminate any high current switching transients. The processor monitors the heat sink temperature of both the 80 and 100 KVAR models. It will turn the cooling fan on when the heat sink temperature reaches 55ºC. The controller will turn off if the heat sink temperature rises above 90ºC and it will reset again when the temperature drops below 85ºC. The switching of the controller is by a control signal from 8 to 24V DC, this can be from an external power supply (J2 EXT). These input signals can be either common positive or common negative. You can also use the onboard internal DC power supply (J2 INT) which provides a +12V DC output, this can be fed back into the controller into the +VE SIGNAL input via ‘volt free’ contacts or semiconductor switches. The maximum DC voltage present when the thyristors are not conducting can be 150% of the peak mains voltage, so any discharge resistors used should be rated accordingly. Discharge reactors should not be used because the continuous DC voltage that is present would destroy them. It is recommended that discharge resistors are used and that they are designed to meet the peak DC voltages which may be seen in a permanent installation.
This allows the power factor load capacitors to discharge before indicating a possible fault condition; the following table shows some recommended settings for various KVAR ratings. POWER IN KVAR DELAY TIME IN SECONDS VRI SETTING 80 60 3 100 80 4 Fan activation 80 and 100 KVAR unit When the temperature of the heat sink reaches 55ºC the cooling fan is activated and it will remain on until the heat sink temperature drops below 50ºC. Over Temperature Alarm If the temperature of the heat sink reaches 90ºC the red fault LED will flash rapidly, the controller and the orange status LED will go off and the fault relay will energise. When the heat sink temperature drops below 85 ºC the controller will reset, the status LED will come back on the red fault LED will turn off and the relay will de-energise. Fuse fail Alarm If the supply or fuse fails in either L1 or L3 inputs the red fault LED and the orange status LED will flash alternately, if the control signal is turned on during this period the red fault LED and the relay will energise and remain latched on continuously until the firing card power supply is turned off. The controller must be powered down in order to allow the controller to reset. Enable input The contacts of the enable input must be closed for the controller to operate. Maintenance Generally thyristor switches are maintenance free but the following points should be observed; This controller is equipped with a fan and it should be checked every two years, if it has become defective it should be replaced with a fan of the same type. Generally the heat sinks should be checked regularly to ensure that the fins are not obstructed with dust or debris, it is worth checking that the thyristor terminals are also free from any pollution. Continuous over temperature tripping will be indicated by the normally open contacts of the alarm relay closing, this may indicate that one of the above f ault modes has occurred. Cooling requirements This robust stack assembly has an operational temperature of 65° C when naturally cooled and has a built in 90° C over temperature trip on the heatsink as a safety feature. The unit should be mounted vertically, with heatsink fins aligned top to bottom, and with sufficient surrounding air space to maximise natural convection cooling. If the unit is mounted in an enclosure or cabinet, adequate ventilation and/or forced air-cooling should be fitted. These controllers have a fan which is normally off, but automatically turns on at high heatsink temperatures (see SPECIFICATIONS – Fan switch-on and over temperature. Load considerations The PFC2 series of power controllers are designed for 3-wire, 3-phase floating- star or closed delta configured capacitive loads. For further information on configured loads, see our supporting datasheet - A C Power Control Specifications and Application Circuits (APC - ref. X10322). Installation If the PFC2 controllers are mounted in a control panel they should be mounted in a vertical position with the heat sink fins running top to bottom. Care must be taken to ensure that sufficient cooling is available for the PFC2 power switches; in continuous operation at maximum current the heat sink temperature can reach 90ºC. Ensure that the heat sink fins are not obstructed by cables or ducting and that the controllers are not fixed directly above one another. Ensure the cabinet is cooled sufficiently to avoid the controllers tripping on over temperature, they will reset when the temperature drops below 85ºC but they will be out of action for that period of time. Maximum dissipated heat:- 1 x PFC2 controller 80KVAR at 400V AC, 2 x116A is approximately 210W. 1 x PFC2 controller 100KVAR at 400V AC, 2 x144A is approximately 260W.
This family carries a “CE” marking. For more information contact our sales desk. A Declaration of Conformity is available on request. SPECIFICATIONS Power/(current ratings): 80kVAR (125A); 100kVAR (150A) @ a typical supply of 415V RMS Input voltage: 415V RMS +/- 10% Frequency: 50/60Hz Control signal input: 8 to 24V DC, Common 0V or Common +VE, Open Collector or Volt Free Contact Alarm relay functions: The voltage free alarm relay is rated for 125V ac @ 2A. LED indicators: Green = DC Power ON, Red = Fault, Orange = Signal enabled, Red/Orange = Capacitors discharging Cooling fan: 24V DC Fan ‘switch-on’: Typically 55 ºC Over Temperature: Trip in temperature @ 90ºC, +/- 1ºC (Status LED indicator ‘flashes’ with ON/OFF rapid pulsing Trip out temperature @ 85ºC, +/- 1ºC Phase loss detection: Phase loss or Fuse failure orange and red LEDs flash alternately Status LED Fault condition: Status LED indicator ‘flashes’ O N/OFF continuously at 1.5 second intervals. Sensor loss detection: Status LED indicator ‘flashes’ ON/OFF continuously in equal intervals. Power cable terminations: Supply, Load and Earth 35mm² rising clamp terminal block. Power cable size: 80KVAR 35mm² 100KVAR 50mm². Terminal torque settings: 3.2Nm min, 3.7Nm max (35mm²) Power terminals only. Signal cable terminations: Remote supply Auxiliary alarm (relay):- 2.5mm² rising clamp terminal block. Control signal: - 2.5mm² rising clamp terminal blo ck. Protection: IP20. Fusing 80kVAR: 160EET (160A) High-Speed Semiconductor type fuse, or equivalent. 1000kVAR: 200EET (200A) High-Speed Semiconductor type fuse, or e quivalent. Working temperature: 65 °C (maximum operational) Dimensions: (80 and 100kVAR) 270mm (D) x 250mm (W) x 130mm (H). Fixing centres: 4 x 4.5mm-clear keyhole slots on fixing centres 22 7mm (W) x 200mm (D). Weight: (80 and 100kVAR) 5.6kg (Max.) Note: SAFETY WARNING – Isolate supply before removing cover; Metal parts, in particular the case may get very hot when the unit is fully operational; DO NOT COVER enclosure ventilation slots. RECOMMENDATIONS Additional supporting documents, which may be appropriate for your application, are available on request. These include X10255: SRA – Safety Recommendations & Advice. NOTE: It is recommended that installation and maintenance of this equipment should be done with reference to the current important requirements regarding installation and safety of electrical equipment. Specific installers should refer to local and national regulations. © These products are protected by unregistered design with United Automation Limited, Southport, UK UNITED AUTOMATION LIMITED Southport Business Park Tel: 0044 (0) 1704 – 516 500 Wight Moss Way Fax: 0044 (0) 1704 – 516501 Southport, PR8 4HQ enquiries@united-automation.co m ENGLAND www.united-automation.com Issue 1 Date 20/02/15 ORDER DETAILS When ordering directly, please use the following stock codes:- Manufacturer stock code Product Description Rating A418303 PFC2 80kVAR 3-phase, 80kVAR, 125A@ 415V, 2/3rds control A418304 PFC2 1000kVAR 3-phase, 100kVAR, 150A@ 415V, 2/3rds control Available on request: Spare HS fuses: 160ET (160A) or 200ET (2 00A) SCR -type Connections This unit has clamp type connectors for all auxiliary-wiring requirements. NOTE: The controller is factory set for an internal power supply. For alternative ‘voltage free’ alarm supply details see Functions section. Please contact our Technical support for further details. Fusing & over temperature It is recommended that fast acting semiconductor type fuses (as supplied) be used for protection. See SRA Data sheet X10255 for further information. It is recommended that supply fuses are installed in the load supply.