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

Huawei / DC power systems

R4875G1 Equipment information & support

The R4875G1 is a high-efficiency power system designed for telecommunication facilities and industrial infrastructure.

Equipment information

Brand
Huawei
Equipment model
R4875G1
Equipment type
DC power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
R4875G1 Official Product View 4

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 200~240VAC)
Nominal DC Output Voltage
-42VDC ~ -58VDC (Nominal -48VDC)
Rated Output Current
75A (maximum 83.3A)
Rated Output Capacity
4000W (high-voltage input mode)
Power Conversion Efficiency
≥96% (up to 96.5%)
Cooling Method
Forced-air cooling with intelligent temperature control and dual fans

Alarms & troubleshooting

AC_IN_FAIL (AC Input Abnormal/Interrupted)
Power LED (Green) OFF, Protection LED (Yellow) ON
Grid outage, AC input breaker tripped, or AC voltage outside operating range (<85 Vac or >300 Vac).
1. Measure the AC line voltage at the rectifier terminal block to verify it is within 85-300 Vac. 2. Inspect the AC input circuit breaker in the power cabinet to check for tripping or loose termination. 3. If the input voltage is nominal, reseat the rectifier module firmly; replace the unit if the fault persists.
OUT_OVP_LOCK (DC Output Overvoltage Lockout)
Power LED (Green) OFF, Fault LED (Red) ON
Internal voltage control feedback failure, incorrect bus voltage configuration from controller, or external voltage backfeed triggering hardware latch.
1. Disconnect the module from the slot and wait at least 1 minute for DC bus capacitors to discharge, then reinsert to reset the latch. 2. Verify the float/equalize overvoltage threshold settings in the system controller (e.g., SMU02C, typically <59 Vdc). 3. If the red LED turns on immediately upon repowering, the internal power stage is defective; replace the rectifier module.
MOD_OTP (Rectifier Over-Temperature Protection)
Power LED (Green) ON or OFF, Protection LED (Yellow) ON
Ambient temperature exceeds operating limits (>75°C), or front/rear airflow vents are severely clogged, causing heatsink thermal shutdown.
1. Check cabinet HVAC/cooling system and ensure ambient air inlet temperature is within rated range (-40°C to +75°C). 2. Clean the air intake mesh on the rectifier faceplate and cabinet dust filters to restore unobstructed airflow. 3. The module auto-recovers once internal temperature drops below threshold; if over-temperature recurs under normal ambient conditions, check fan operation or replace module.
FAN_FAULT (Fan Locked-Rotor/Speed Anomaly)
Power LED (Green) ON or Blinking, Fault LED (Red) Blinking
Foreign object blocking fan blades, failure in the fan drive circuit, tachometer signal loss, or mechanical bearing degradation.
1. Visually inspect the front fan grille and remove any cable ties, dust accumulations, or debris obstructing the blades. 2. Reseat the module and observe if the fan executes its high-speed spin-up self-test upon insertion. 3. If the fan does not spin or the alarm persists after clearing obstructions, replace the rectifier module immediately.
CAN_COMM_FAIL (CAN Communication Loss & Current Imbalance)
Power LED (Green) Blinking slowly (0.5 Hz), Protection and Fault LEDs OFF
Poor contact on module rear backplane connector, damaged CAN bus terminating resistor, loose subrack communication cables, or faulty system controller (SMU).
1. Pull the rectifier out ~10 cm, inspect rear gold finger pins for bending or oxidation, then firmly re-lock the handle to ensure full engagement. 2. Check the system controller (SMU02C/02B) to see if the module slot address and real-time parameters are recognized. 3. Swap the module into a known-good working slot; if communication recovers, the original subrack backplane is damaged; if not, replace the module.

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