Emerson 200I/48-NT5C05C user manual Forced sharing FS

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Functional description 39

Example 1 : If the rectifier is expected to provide 100 A at 48 V

V ( preset ) = 48 V + 0.8 V + ( 100 x 300 mV ) 200

V ( preset ) = 48 V + 0.8 V + 0.15 V = 48.95 V

Example 2 : If the rectifier is expected to provide 40 A at 48 V

V ( preset ) = 48 V + 0.8 V + ( 40 x 300 mV ) 200

V ( preset ) = 48 V + 0.8 V + 0.06 V = 48.86 V

Forced sharing ( FS )

When both bottom DIP switches ( SLS / FS ) are set to the FS position, forced load sharing is achieved by an internal control circuit that modifies the loop reference to equally share the output currents between rectifiers. The setting of the output voltage is not modified with changes in output load, as is the case in the slope share mode. In this mode, the rectifiers will share the load within ± 2 % of their maximum output rating.

For this to occur the rectifiers must communicate their operating current to the other rectifiers in the same power plant. The current share terminal of all the rectifiers ( P1-17 ) in the same power plant must be connected through the control cables and controller. In applications using the NT6C43PB interconnect board, such a connection is implemented automatically.

Adjust the rectifier float voltage to the desired system float voltage, plus

0.8volts, to compensate for an internal drop when the rectifier dc breaker is put in the ON position.

Example 3 : for 48 V float voltage

V ( preset ) = 48 V + 0.8 V = 48.8 V

Emerson Energy Systems

Rectifier 200I/48NT5C05C Installation and User Manual

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Contents Helios Modular Switch Mode Rectifier 200I/48 NT5C05C Page Emerson Energy Systems Page Publication history This page is left blank intentionally Contents List of Procedures List of FiguresList of Tables Ac female plug in a 1200 a cabinet This page is left blank intentionally Purpose of this manual General informationTypical mounting in a cabinet or frame Models and mounting configurationsMechanical and electrical specifications SpecificationsOperation specifications and ambient conditions Storage conditions Ambient conditions for the rectifier OperatingConditions TransportationMechanical specifications of the NT6C43CB 1200 a cabinet Ambient conditions of a 1200 a cabinetOutput voltage Protecting the premises InstallationMounting configurations Tools and test equipmentOptimizing the life of the equipment Personal safety and protecting the equipmentPreventing damage caused by over-tightening Preventing personal injuryProtecting against electrical shocks Short circuit hazard Installing in a frameInstalling in a cabinet Procedure 1 Installing the rectifier in a frame Step ActionAnchoring the cabinet Procedure 2 Installing a rectifier in a cabinet Step ActionInstalling the rectifier Cabling and connectingConnecting the dc output terminals to the busbars Electrical connections should meet standards Connecting ac to the rectifiersHazardous potentials Cabling ac the NT5C05CA / CB rectifiers Connecting ac to the rectifier NT5C05CC Controller NT NT6C25BA or NT6C25BB Connecting the control signalsPin assignment for connectors J7 to J12 Monitoring of the shunt currentFunction Input/ Output Pin assignment for connector J13 Function Functional description Overview Input circuitOutput circuit AC breaker Monitoring and control circuitsOutput capacitors Description of the front panel Breakers DC circuit breakerFront panel controls and LEDs Switches, controls and LEDsAC on ac voltage monitoring CL current limit indicatorFAN ALM fan failure alarm Front panel LEDsHvsd high voltage shutdown RFA rectifier failure alarmSEN Fail sense fail alarm Local and remote adjustments and controlsSwitches Description Rectifier input / output signals to the controllerDesignation Description Remote equalize control EQL Volt / AMP digital meter switchSlope sharing SLS Rectifier parallel operationForced sharing FS Remote Hvsd Local and remote Hvsd resetSwitch Position Delay SEC Setting the start-up delayStart up delay DIP switch Control signals on connector P1Remote on / OFF control TR CB OFF NC This page is left blank intentionally Standard settings Standard settings for the rectifier Parameter SettingOperation Starting up and adjusting Procedure 9 Starting up the rectifier Step ActionAdjusting the high voltage shutdown Hvsd Adjusting the equalize voltage EQL Adjusting the slope shareVerifying the current limit Adjusting the forced load sharing Maintenance Replacing the air filterReplacing the fan unit Calibrating the Volt / Amp Multimeter Preventing short circuitsRe-assembling Remotely Resetting the rectifier after an Hvsd high voltage shutdownThis page is left blank intentionally Diagnosing system faults Fault symptom Possible causes TroubleshootingTroubleshooting Part Number CPC Appendix a Replacement partsAppendix a Recommended Replacement Parts Appendix B Technical service assistance Local toll-free prefixesCountry Prefix Toll-free technical assistance numbers United States Canada Europe Asia and the PacificCaribbean and Latin America Middle-East Cala Abbreviations and acronyms RFA Page Helios Modular Switch Mode Rectifier 200I/48 NT5C05C