Emerson 200I/48-NT5C05C user manual Setting the start-up delay, Adjusting the forced load sharing

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48 Operation

Procedure 9 - Starting up the rectifier ( continued )

Step

Action

23Turn ON the other rectifiers in the system.

Setting the start-up delay

24

Use this feature to reduce the inrush currents when two or more rectifiers are connected to a common ac input. Set the DIP switches on the front panel for the required start-up delay, from 4 to 124 seconds ( see Table 13 ).

Adjusting the forced load sharing

25If the forced share mode is chosen, adjust the float voltage of each rectifier to the appropriate value plus 0.8 volts in slope share mode, as described above. For example, to have a 52.1 V float voltage :

52.1 V +0.8 V = 52.9 V.

This compensates for the internal voltage drop when the dc breaker of the rectifier is put in the ON position. Connect all the FS wires of the rectifiers together and set the two bottom DIP switches, located on the front panel, to FS for forced load sharing ( see Figure 10 ).

26If the rectifiers are connected to the NT6C43PB board, in the cabinet or frame option, the P1-17 signals from all the rectifiers are automatically connected. After step 25 has been completed, the rectifiers will automatically share the output current.

When forced load sharing is desired, but the NT6C43PB board is not used or is bypassed, pins P1-17 of all the rectifiers must be made common at a single point. This connection could be a splice connection of all the P1-17 wires in the control cables, using a 2B16 splice from T&B ( or equivalent ) in the control panel.

The E1 terminal on the NT6C43PB board can be used when forced load sharing is desired amongst rectifiers on two, or more, cabinets or frames. In this case, the E1 terminal from all the cabinets or racks must be daisy chained with metric No. 7 ( AWG 22 ) wire.

27Repeat step 21, but in equalize mode, to verify that the current is shared equally amongst the rectifiers when a remote equalize signal is applied, or when all local FLOAT / EQL toggle switches are toggled in the EQL position. If the current reading is too low, or is 0, turn the EQL potentiometer clockwise until proper sharing is achieved. If the current is too high, or if the rectifier is in the current limit mode, turn the EQL potentiometer counterclockwise.

28Deactivate the EQL mode to return to the normal float mode.

end

UM5C05C P0745680 Standard 6.00 October 2001

Emerson Energy Systems

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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 General information Purpose of this manualModels and mounting configurations Typical mounting in a cabinet or frameSpecifications Mechanical and electrical specificationsOperation specifications and ambient conditions Ambient conditions for the rectifier Operating ConditionsTransportation Storage conditionsMechanical specifications of the NT6C43CB 1200 a cabinet Ambient conditions of a 1200 a cabinetOutput voltage Installation Mounting configurationsTools and test equipment Protecting the premisesPersonal safety and protecting the equipment Preventing damage caused by over-tighteningPreventing personal injury Optimizing the life of the equipmentProtecting against electrical shocks Installing in a frame Installing in a cabinetProcedure 1 Installing the rectifier in a frame Step Action 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 NT6C25BBPin 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 Monitoring and control circuits Output capacitorsDescription of the front panel Breakers DC circuit breaker AC breakerSwitches, controls and LEDs Front panel controls and LEDsCL current limit indicator FAN ALM fan failure alarmFront panel LEDs AC on ac voltage monitoringRFA rectifier failure alarm SEN Fail sense fail alarmLocal and remote adjustments and controls Hvsd high voltage shutdownSwitches Description Rectifier input / output signals to the controllerDesignation Description 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 SECStart 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 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 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