{"product_id":"siemens-6se7028-2hf84-1hh1-simovert-pre-charging-module","title":"Siemens 6SE7028-2HF84-1HH1 SIMOVERT Pre-Charging Module","description":"\u003cp\u003eThe Siemens 6SE7028-2HF84-1HH1 is a dedicated PCU1 Pre-Charging Module engineered for the legacy SIMOVERT MASTERDRIVES variable frequency drive (VFD) and inverter product families. When a drive is first connected to main AC power, the uncharged internal DC link capacitors act as a near-perfect short circuit. This module functions at the hardware tier to intercept incoming line power, routing it through high-power current-limiting resistors to safely and gradually ramp up the capacitor voltage before the main contactor closes, protecting the primary rectifier bridge from catastrophic inrush current spikes.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003e6SE7028-2HF84-1HH1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003eSIMOVERT MASTERDRIVES\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComponent Typology\u003c\/td\u003e\n\u003ctd\u003ePre-Charging Module (PCU1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eGermany\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e0.18 kg (0.40 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e200 mm x 100 mm x 50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Line Voltage Range\u003c\/td\u003e\n\u003ctd\u003e660-690 VAC nominal tracking paths\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Frequency Envelope\u003c\/td\u003e\n\u003ctd\u003e50\/60 Hz automated line frequency synchronization\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmbient Operating Range\u003c\/td\u003e\n\u003ctd\u003e-10 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDrive Control Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Control \u0026amp; Drive Communications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacitor Inrush Mitigation and Timing Synchronization\u003c\/strong\u003e The PCU1 module monitors line potentials directly across the 660-690 VAC inputs. Operating parallel to the drive's main control loop, the internal electronics regulate the power-up sequence, holding back the main contactor bypass command until the internal DC bus voltage reaches approximately 80% to 90% of its nominal rectified peak. This active voltage mapping prevents localized thermal degradation of the power components during startup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Potential Signal Conditioning and Logic Separation\u003c\/strong\u003e By managing the high-voltage pre-charge sequence on a separate 0.18 kg physical circuit layout, the module keeps harsh electrical transients contained. It provides a distinct physical and inductive isolation barrier between the volatile 690 V distribution lines and the drive's low-voltage internal command gates, safeguarding central memory blocks and microprocessors against high-frequency commutation noise.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What programmatic or electrical faults manifest on the MASTERDRIVES operator panel if the pre-charging module fails open?\u003c\/p\u003e\n\u003cp\u003eA: If the PCU1 resistor circuit or control logic fails open, the internal DC link capacitors will not charge. Upon a start command, the host drive will detect a low bus potential and trip an unmasked \u003cstrong\u003eF008 (DC Link Undervoltage)\u003c\/strong\u003e or a pre-charging timeout fault on the PMU display, preventing the inverter from running.\u003c\/p\u003e\n\u003cp\u003eQ: Can the 6SE7028-2HF84-1HH1 module be safely extracted while the main AC line is energized?\u003c\/p\u003e\n\u003cp\u003eA: No, unseating or installing this module while the 660-690 VAC primary source is live is restricted. Modifying or breaking the pre-charge logic path under live conditions can trigger sudden inductive voltage arcs, cause high inrush currents that blow the primary semiconductor branch fuses, and damage the underlying control board interface.\u003c\/p\u003e","brand":"SIEMENS","offers":[{"title":"Default Title","offer_id":45121625325683,"sku":"6SE7028-2HF84-1HH1","price":410.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-06-22_16-40-11_8bd32d97-8636-43fa-b0a0-6c238af102ef.png?v=1782119499","url":"https:\/\/www.dcssupplier.com\/products\/siemens-6se7028-2hf84-1hh1-simovert-pre-charging-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}