Delta MCS-1800 manual Low Voltage Alarm, Low Voltage Disconnect Alarm System equipped with PDU

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DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

8.3.2 Troubleshooting

The HV alarm is usually caused when the equalize voltage exceeds the HV threshold setting. Another probable cause that the temperature compensation voltage exceeds the HV threshold during cold temperature operation. During this alarm condition, the system continues to operate.

8.4Low Voltage Alarm

8.4.1Description

The Low Voltage alarm (LV) is a minor alarm activated when the DC output voltage decreases below the LV threshold setting. When the system voltage decreases below the LV LED located on the ALU panel, and activates the LV alarm contact. The rectifiers remain on line during this minor alarm condition. When the system voltage increases above the threshold setting, the ALU extinguishes the LV LED and deactivates the LV alarm contact.

8.4.2 Troubleshooting

The LV alarm condition occurs during a brownout condition or prior to a complete AC Fail condition caused by commercial AC problem conditions.

Another probable cause is that the temperature compensation voltage decreases the float voltage below the LV threshold during hot temperature operation. During this alarm condition, the system continues to operate.

8.5Low Voltage Disconnect Alarm (System equipped with PDU)

8.5.1Description

During an AC Fail condition, the rectifiers are shut down and the reserve batteries begin to discharge. When the battery cells discharge below the LVD setting, the ALU lights the LVD LED on the ALU panel, activates the LVDS OPEN alarm contact, and opens the LVDS contactor. When the AC recovers, the LVBD recovers automatically. The ALU extinguishes the LVD LED and resets the normally closed set of alarm contacts.

8.5.2 Troubleshooting

If the battery disconnect switch remains open after voltage is restored to the rectifiers, one of the following is occurring:

1.The ALU may be faulty. Swap out the ALU with a spare and verify voltage settings.

2.The LVBD coil windings may be open. With a digital multimeter, check the LVBD coil windings.

8.6Fuse/Circuit Breaker Fail Alarm (System equipped with PDU)

8.6.1Description

If the DC load output fuse opens or battery switch trip off, the ALU sends the alarm condition, lights the LED on the ALU panel, and activates the Fuse Fail alarm.

8.6.2 Troubleshooting

To troubleshoot the fuse/circuit breaker fail alarm condition, perform the following steps:

1.Verify that the fuse/circuit breaker is the proper size (use 80% derating guide).

2.Verify that the external fault that might cause fuse/circuit breaker tripping is removed.

3.Replace the blown fuse with a fuse with the same rating or of the corrected value. In case of a circuit

8-2

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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