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Vertiv / DC Power Systems (-48V)

ER22020-T Equipment information & support

The Vertiv ER22020-T is a 4.4kW high-power switch-mode rectifier module delivering 220Vdc/20A for utility substations and critical industrial DC systems. Powered by full DSP digital control and LLC resonant conversion, it provides industry-leading electrical stability across extreme temperatures.

Equipment information

Brand
Vertiv
Equipment model
ER22020-T
Equipment type
DC Power Systems (-48V)
Controller / software version
Confirm against the installed equipment
View full product specifications
Vertiv ER22020-T High-Power DC Rectifier Module (220Vdc/20A 4.4kW Utility Substations & DC Systems) - Internal Assembly & Wiring Layout

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

Rated DC Output Current
20A (Full Load Power 4400W)
Nominal Conversion Efficiency
≥ 94.5%
Rated DC Output Voltage
220VDC (176V ~ 286V)
Supervisory Bus & Sharing
Isolated CAN Bus / Autonomous Sharing
AC Input Phase Voltage Range
323Vac - 475Vac 3-Phase 3-Wire Balanced VAC
Overall System Efficiency
Up to 96.2% (Gold Standard)

Alarms & troubleshooting

AC_IN_FAIL / Utility Grid Failure
Input Amber LED flashing, Master Alarm Red solid
Utility power outage, AC voltage outside tolerance (<85Vac or >300Vac), or tripped circuit breaker
1. Measure incoming AC line voltage to verify it has normalized; 2. Confirm that the input breaker on the distribution panel is closed; 3. Once AC grid recovers, the module soft-starts automatically to resume DC output.
DC_OV_LOCKOUT / DC Overvoltage Shutdown
Fault Red LED solid, module completely shut down
Internal voltage feedback loop failure, lightning surge ingress, or severe current-sharing imbalance
1. Probe DC bus voltage with a digital multimeter to rule out external spikes; 2. Open the input breaker, extract the module, wait 30s for capacitor discharge, and reinsert; 3. If overvoltage persists upon power-up, replace the internal control board.
FAN_FAIL_OTP / Fan Failure & Over-Temperature
Temp Amber LED solid, output power derated proportionally
HVAC failure in server room, clogged air intake filters, or seized ball-bearing cooling fan
1. Clean dust accumulation from front-panel intake grilles to ensure unrestricted airflow; 2. Confirm equipment room ambient temperature is maintained under 25°C; 3. Inspect fan rotor for mechanical obstruction; hot-swap replacement fan if seized.

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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