Emerson 200I/48-NT5C05C user manual Rectifier parallel operation, Slope sharing SLS

Page 38

38 Functional description

The rectifier can be started when it is connected across a completely discharged battery without requiring human intervention or operating protective devices. A transition from constant voltage operation to constant current operation and from constant current operation to constant voltage operation occurs automatically, as determined by the output current. The current limiting circuit is functional in float and equalize modes.

4.2.8.Rectifier parallel operation

The rectifier can operate in parallel with other rectifiers having similar output characteristics. It shares the total load in proportion to its output rating. Two methods for sharing load current are available :

Slope sharing

Forced sharing

Selecting either mode is done by setting the two bottom DIP switches, SLS / FS, located on the front panel. The rectifier is factory set to the slope sharing mode.

Slope sharing ( SLS )

When both bottom DIP switches are set to the SLS position, conventional load sharing is achieved through a -300 mV slope on the output voltage of the rectifier, from no load to full load. This mode should be used when rectifiers from different manufacturers are not all equipped with the forced load-sharing feature. In this mode, the units will share the load within

±10% of their maximum output rating.

To accurately preset the float voltage of the rectifier, its current in the plant environment must be predicted and the preset output floating voltage must be calculated using the formula found below. In the formula, 0.8 volts is added to the float voltage to compensate for an internal voltage drop when the rectifier dc breaker is put in the ON position.

V ( preset ) = Vo ( desired ) + 0.8 V + ( Io ( running ) x 300 mV ) 200

UM5C05C P0745680 Standard 6.00 October 2001

Emerson Energy Systems

Image 38
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 Tables List of ProceduresList of Figures Ac female plug in a 1200 a cabinet This page is left blank intentionally General information Purpose of this manualModels and mounting configurations Typical mounting in a cabinet or frameSpecifications Mechanical and electrical specificationsOperation specifications and ambient conditions Transportation Ambient conditions for the rectifier OperatingConditions Storage conditionsOutput voltage Mechanical specifications of the NT6C43CB 1200 a cabinetAmbient conditions of a 1200 a cabinet Tools and test equipment InstallationMounting configurations Protecting the premisesPreventing personal injury Personal safety and protecting the equipmentPreventing damage caused by over-tightening Optimizing the life of the equipmentProtecting against electrical shocks Procedure 1 Installing the rectifier in a frame Step Action Installing in a frameInstalling in a cabinet Short circuit hazardProcedure 2 Installing a rectifier in a cabinet Step Action Anchoring the cabinetCabling and connecting Installing the rectifierConnecting the dc output terminals to the busbars Connecting ac to the rectifiers Electrical connections should meet standardsHazardous potentials Cabling ac the NT5C05CA / CB rectifiers Connecting ac to the rectifier NT5C05CC Connecting the control signals Controller NT NT6C25BA or NT6C25BBFunction Input/ Output Pin assignment for connectors J7 to J12Monitoring of the shunt current Pin assignment for connector J13 Function Output circuit Functional descriptionOverview Input circuit Description of the front panel Breakers DC circuit breaker Monitoring and control circuitsOutput capacitors AC breakerSwitches, controls and LEDs Front panel controls and LEDsFront panel LEDs CL current limit indicatorFAN ALM fan failure alarm AC on ac voltage monitoringLocal and remote adjustments and controls RFA rectifier failure alarmSEN Fail sense fail alarm Hvsd high voltage shutdownDesignation Description Switches DescriptionRectifier input / output signals to the controller Volt / AMP digital meter switch Remote equalize control EQLRectifier parallel operation Slope sharing SLSForced sharing FS Local and remote Hvsd reset Remote HvsdSetting the start-up delay Switch Position Delay SECRemote on / OFF control TR Start up delay DIP switchControl signals on connector P1 CB OFF NC This page is left blank intentionally Operation Standard settingsStandard settings for the rectifier Parameter Setting Adjusting the high voltage shutdown Hvsd Starting up and adjustingProcedure 9 Starting up the rectifier Step Action Verifying the current limit Adjusting the equalize voltage EQLAdjusting the slope share Adjusting the forced load sharing Replacing the fan unit MaintenanceReplacing the air filter Re-assembling Calibrating the Volt / Amp MultimeterPreventing short circuits Resetting the rectifier after an Hvsd high voltage shutdown RemotelyThis page is left blank intentionally Troubleshooting Diagnosing system faults Fault symptom Possible causesTroubleshooting Appendix a Replacement parts Part Number CPCAppendix a Recommended Replacement Parts Country Prefix Appendix B Technical service assistanceLocal toll-free prefixes Caribbean and Latin America Middle-East Cala Toll-free technical assistance numbersUnited States Canada Europe Asia and the Pacific Abbreviations and acronyms RFA Page Helios Modular Switch Mode Rectifier 200I/48 NT5C05C