Delta MCS-1800 System Alarm, PSU Block Diagram, PSU Operating Principle, Current Limit Setting

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DELTA MCS-1800 3U Power Sh elf

Installation, Operations and

Maintenance Manual

2.Place the digital multimeter probe in the V+ and V- output voltage connecter.

3.Adjust the float voltage by using a screwdriver to turn the FL point to the voltage value as shown on the meter. The tolerance error should not exceed 0.02V.

Notes:

1.Turning the variable resistor adjustment point clockwise increases the value, and counterclockwise

2.Refer to Figure 3 (rectifier front view) for the location of V+, V- and FL point.

3.When the setting is completed, temperature and voltage compensation must be reset to the default value.

3.3.3Current Limit Setting

Warning: Current limit setting is not intended to be adjusted in the field. Users should only use it for their reference.

Current limit adjustment is made by turning the CL variable resistor with the digital multimeter probes in the I+, I- test points. This current limit is set at the factory. The factory setting is always the maximum value of 110%. For a 48V/30 Amp rectifier, the computation for the current limit is 1.1⋅30=33 Amps.

The following adjustment procedure is for reference only:

1.At the rectifier, place the digital multimeter probes in the I+, I- test points.

2.Place a small screwdriver in the CL adjustment point.

3.Turn the variable resistor counterclockwise to increase the value. Turn the variable resistor clockwise to decrease the current limit value.

3.4System Alarm

During an alarm condition, the faulty rectifier illuminates its RFA light on the front panel. The rectifier fail alarm signal is sent to the ALU, which processes the alarm, closes the RFA alarm contacts, and lights the alarm LEDs.

3.5 PSU Block Diagram

Refer to Figure 5.

3.6 PSU Operating Principle

After applying the incoming line voltage to the rectifier, current is applied to the EMI filter and circulates through protection components such as the AC circuit breaker and the fuse. The major functions of the protection devices are to prevent the rectifier from being damaged by surge voltage, to efficiently reduce the noise of differential mode and common mode, to eliminate the high frequency noise from input current, and to prevent noise reverse to the source circuit.

The AC input voltage is rectified and converted to a 400VDC bus through a PFC boost stage. This PFC stage maintains the Power Factor at >.99 and the Total Harmonic Distortion (THD) at <5%.

The 400 VDC bus voltages is modulated at a frequency higher than 100KHz and stepped down through a transformer. Output of this transformer is rectified and filtered to provide the output DC voltage.

3-5

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Contents Delta MCS-1800 Power Shelf Delta MCS 1800 3U Power Shelf Table of Contents Acronyms and Abbreviations System Start -Up ProcedureSystem Alarms and Troubleshooting MaintenanceGeneral Using This ManualProduct Main Features System SpecificationsProduct Description Environmental Data Specification ValueInput Electrical DataOutput Status/Alarm IndicatorsMechanical Data Dimension Value Electrical Power Supply Unit PSUSpecifications DescriptionCondition Response ProtectionAdjustments Adjustment DescriptionEnvironmental Operation and Adjustment PSU Operating Principle System AlarmPSU Block Diagram Current Limit SettingInput Voltage Range Output Alarm Control UnitInput Characteristics Characteristic ValueRelay Output Settings DescriptionIndicators Voltage/CurrentPhysical ALU Alarm Signal DescriptionsSettings and Control Alarm Control Unit Block DiagramTemperature Alarm Settings Description CommentAC High Voltage Alarm AC Low Voltage AlarmFloating / Equalize control Temperature Shut DownControl Settings Description Comment Remote SMR On/Off Hvsd RecoveryDC Cabling Low Voltage Battery Disconnect System equipped with PDUBattery Connections System equipped with PDU DC DistributionInstallation Temperature and Alarm Connections Signal I/P connectorAC High Voltage Aux. Relay output wiring System Start-Up Procedure High Voltage Alarm Description System Alarms and TroubleshootingAC Fail Voltage Alarm Description High Voltage Shutdown AlarmLow Voltage Alarm Low Voltage Disconnect Alarm System equipped with PDUFuse/Circuit Breaker Fail Alarm System equipped with PDU Rectifier Fail Alarm Alarm Unit FailMaintenance Cleaning and MaintenanceRemoving and Replacing a Rectifier Unit Cispr Acronyms and Abbreviations10-2 10-3 Attachment ES 48/120-JAAxx、ES 24/200-JAAxx -48V/+24VPower Shelf PDU Delta MCS 1800 3U Power Shelf Alarm Relay Output 4ES 48/120-JAAxx Shelf Wiring MCS 1800 Series Shelf 5ES 24/200-JAAxx Shelf Wiring Diagram ES 48/90-JBAxx -48V Power Shelf With PDU ES 48/90-JBAxx DC Output Lug Distribution Delta MCS 1800 3U Power Shelf 台達電子工業股份有限公司 交換式電源供應器 ES 48/90-JBAxx Battery and Load Breaker Distribution ES 48/90-JBAxx Shelf Wiring MCS 1800 Series Shelf ES 48/90-JFAxx -48V Power Shelf With PDU ES 48/90-JFAxx Alarm Relay Output connectors ES 48/90-JFAxx AC Input Connector ES 48/90-JFAxx Battery Temperature ES 48/90-JFAxx DC Output Lug Distribution ES 48/90-JFAxx Shelf Wiring MCS 1800 Series Shelf Alarm Control Unit SMR RFA Power Supply Unit Eeprom SMR Block Diagram TEL -3-4526107P/N MCS-1800 Power Shelf