lee@ricewind.comTel+86 17621197907Serving 50+ countries
RICEWIND

Huawei / Indoor power systems

Huawei EPS200-4850A Equipment information & support

The Huawei EPS200-4850A is a robust 5U 19-inch rack-mount embedded DC power system delivering up to 200A at -48VDC across 4 high-efficiency 50A rectifier slots, equipped with smart SMU controller telemetry and comprehensive AC/DC distribution protection.

Equipment information

Brand
Huawei
Equipment model
Huawei EPS200-4850A
Equipment type
Indoor power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
Huawei EPS200-4850A Official Product View 3

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

System Output Capacity
200 A
Nominal Output Voltage
-48 VDC
Output Voltage Range
-42 ~ -58 VDC
Rectifier Module Slots
4 slots (compatible with R4850G / R4850N high-efficiency rectifiers)
System Comprehensive Efficiency
> 96.0%
Physical Dimensions Spec
222 × 482 × 330 mm (5U 19-inch)

Alarms & troubleshooting

AC_FAIL (AC Mains Failure)
Rectifier Green LED off, Red LED solid on; SMU red ALM indicator illuminated
Utility grid blackout, AC input circuit breaker tripped, loose terminal wiring, or AC phase voltage below cutoff threshold (<85 VAC)
1. Measure phase and line voltages at the EPS200 AC input terminal blocks using a digital multimeter. 2. Inspect the upstream distribution breaker and the internal AC input miniature circuit breaker (MCB) to ensure they are closed. 3. Tighten all AC screw terminal connections, verify voltage stability, and ensure rectifier green Run LEDs return to solid on.
RECT_HVSD (Rectifier DC Output Overvoltage Lockout)
Faulty rectifier Red LED solid on, Green LED off; SMU red Alarm LED on
Internal voltage sampling failure or uncontrolled DC bus spike causing module output to exceed hardware protection limit (>59.5 VDC), triggering hardware shutdown lockout
1. Pull out the faulted rectifier module, wait 3 minutes for internal bus capacitors to discharge, and reinsert it to clear the lockout. 2. Access the SMU monitor menu to confirm float/equalized voltage settings are within normal range (53.5V to 56.4V). 3. If the module trips into red lockout immediately upon reinsertion, the internal power circuit is damaged; replace the rectifier module.
FAN_FAIL (Rectifier Fan Failure)
Rectifier Yellow LED blinking or solid on; SMU yellow Alarm LED illuminated
Rectifier airflow duct dust accumulation, foreign object obstruction, fan bearing wear/seizure, or loss of tachometer speed feedback
1. Pull out the affected rectifier module and visually inspect the front grill and fan impellers for blockages. 2. Clean the air channel and fan blades using an ESD-safe brush and dry compressed air. 3. Reinsert and latch the module securely; if the fan fails to spin or SMU continues to report 0 RPM, replace the fan assembly or the rectifier module.
COMM_FAIL (Rectifier CAN Communication Failure)
Rectifier Green LED flashing slowly (0.5 Hz), Yellow LED solid; SMU shows Comm Fail alarm
Poor contact on backplane gold-finger connector, loose SMU controller, open-circuit CAN bus termination resistor, or damaged module CAN transceiver causing polling timeout
1. Verify that the SMU02 monitoring unit is completely seated in the subrack and latches are locked. 2. Remove the affected rectifier and inspect the rear connector and backplane pins for bent pins, debris, or damage, then reinsert firmly. 3. Swap the module into a known-working empty slot; if communication remains unestablished, replace the faulty rectifier module.
LLVD_DISC (Load Low Voltage Disconnect)
SMU red Alarm LED solid on, audible buzzer sounding; LLVD contactor open state signaled
Prolonged mains outage causing deep battery discharge below the LLVD threshold (default 45.0 VDC), forcing contactor opening to preserve emergency loads
1. Restore AC utility power immediately or deploy a mobile diesel generator to supply the power rack. 2. Measure the total battery string voltage with a multimeter to verify deep discharge status and verify battery circuit breakers are closed. 3. Once AC is restored, verify rectifiers start up into boost charge mode; confirm the LLVD contactor automatically reconnects once bus voltage rises above reconnect threshold (typically 48.0 VDC).

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

Share on-site information

  1. 01

    Identify the exact model

    Record the nameplate, system model and controller or module model.

  2. 02

    Keep the alarm details

    Record the full alarm text, indicator colour, timing and whether it persists.

  3. 03

    Describe recent changes

    Note recent replacements, software updates or configuration changes.

Record information visible in the existing interface. Electrical measurements, disassembly and replacement should follow the applicable manufacturer's manual and be performed by qualified personnel.

Your model and these details will be added to the enquiry form for you to review before sending.

Related technical articles

Browse the technical guides or send a question about this model.

View all articles

Need a replacement module or supporting equipment?

Confirm the full model, system configuration and compatibility requirements before enquiring about suitable products.

Ask about suitable products

Have a model and an on-site issue?

Share the exact model, alarm text and observed symptoms to help identify relevant information and compatibility requirements.

Request technical support