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Vertiv / Power management

PSS48100-2 Equipment information & support

The Vertiv PSS48100-2 is a compact 19-inch 2U embedded -48VDC power supply system delivering up to 100A continuous output, engineered for telecom access networks, base stations, and outdoor enclosures.

Equipment information

Brand
Vertiv
Equipment model
PSS48100-2
Equipment type
Power management
Controller / software version
Confirm against the installed equipment
View full product specifications
Vertiv PSS48100-2 Official White Background Photo View 1

Information below comes from the current product catalogue. Confirm the controller, software version and configuration of the installed equipment separately.

AC Input Voltage Range
85VAC ~ 300VAC (Nominal 220VAC) VAC
Smart Monitoring Controller
PSM-B2 / M221S Central Controller
Cooling Method
Temperature-regulated air cooling
Nominal Output Voltage
-48VDC VDC
Rated Output Current
100A (System Capacity 4.8kW)
Managed Rectifier Capacity
2 Slots for HD4850-2 / R48-2900U Modules

Alarms & troubleshooting

AC_MAINS_FAIL
System Red Alarm LED solid ON; AC distribution indicator OFF
AC mains blackout, upstream input circuit breaker tripped, or voltage out of operational limits (<80VAC or >305VAC)
1. Measure AC input terminal voltage with a DMM; 2. Inspect and reset upstream breaker or ATS transfer switch; 3. Verify that the AC Surge Protective Device (SPD) has not shorted out or failed.
DC_VOLT_HIGH
Controller Red Alarm LED flashing; continuous audible buzzer alarm
Rectifier voltage runaway, internal feedback loop breakdown, or misconfigured equalize voltage threshold > -58.0VDC
1. Hot-unplug rectifiers one by one to identify the runaway unit (bus voltage drops when faulty unit is removed); 2. Verify controller float/equalize setpoints (nominal: -53.5VDC to -56.4VDC); 3. Replace the defective rectifier.
LLVD_DISCONNECT
Controller Amber Major Alarm LED solid ON; priority-2 load contactor status OFF
Mains outage prolonged, battery discharged below LLVD threshold (default -44.0VDC), triggering load shed contactor
1. Confirm duration of mains outage and estimate remaining battery run-time; 2. Dispatch mobile emergency generator to restore AC feed; 3. Upon AC recovery, confirm automatic LLVD contactor re-engagement and battery recharge.
RECTIFIER_COMM_FAIL
Controller Amber LED ON; specific rectifier module Yellow Comm LED flashing or OFF
CAN bus communication loss between controller and rectifier, oxidized backplane pins, or damaged rectifier ID IC
1. Unseat rectifier and inspect backplane connector pins for physical damage or debris; 2. Firmly reinsert module and engage locking latch; 3. Run 'Rescan Nodes' on controller; 4. Swap slot to isolate backplane vs module defect.
BATT_TEMP_HIGH
Controller Amber Warning LED flashing; LCD displays battery temperature warning
Site cooling/HVAC failure, battery thermal runaway/internal short, or detached/defective NTC temperature probe
1. Scan individual battery blocks with an infrared thermometer to detect localized thermal hotspots or bulging; 2. Verify site cooling fans and air conditioning status; 3. Measure NTC probe resistance against temp-curve and re-affix firmly.

Access Complete Maintenance & Full Alarm Troubleshooting Manual

This page lists high-frequency critical alarm codes commonly encountered in field maintenance. Comprehensive manufacturer troubleshooting matrices, board-level repair guides, detailed electrical schematics, and firmware commissioning manuals are delivered alongside equipment upon formal project procurement, accompanied by dedicated FAE technical support.

Contact Account Manager for Full Manual

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