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

Delta / DC power systems

Delta DPR 2900B-48 Equipment information & support

The Delta DPR 2900B-48 is an industrial-grade, hot-swappable single-phase switch-mode rectifier module engineered with advanced resonant soft-switching topology and active PFC. Supporting a wide 90V AC to 300V AC input range, it delivers a nominal 53.5V DC (adjustable 42V to 58V DC) and up to 2900W/50A of clean, ultra-low ripple DC power tailored for telecommunications and critical infrastructure.

Equipment information

Brand
Delta
Equipment model
Delta DPR 2900B-48
Equipment type
DC power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
Delta DPR 2900B-48 Industrial Telecom Rectifier Module 53.5V 50A 2900W Single Phase AC Input Official Studio Photo 2

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

Rated Output Power
2900W (50A @ 58V DC)
Nominal DC Output Voltage
42V DC ~ 58V DC (Nominal 53.5V DC)
Rated Output Current
50A Continuous Constant Current Output
AC Input Voltage Range
90V AC ~ 300V AC (Nominal 220V AC)
Power Conversion Efficiency
≥ 92% (Industrial Grade Robust Efficiency)
Cooling Method
Built-in Intelligent DC Exhaust Fan

Alarms & troubleshooting

AC_FAIL (AC Input Failure / Out of Range)
Green LED OFF, Red LED Solid ON
Utility mains outage, upstream AC breaker trip, or AC input voltage outside operational threshold (<80VAC or >300VAC).
1. Measure AC phase-to-neutral voltage at the shelf slot connector using a calibrated DMM. 2. Verify the upstream AC distribution breaker status in the ACDU and reset if tripped. 3. If input voltage is within operational range (80-300VAC), unseat the module, inspect backplane connector pins for thermal damage or arcing, reseat firmly, and verify self-test sequence.
DC_OVP_LOCK (DC Output Overvoltage Lockout / HVSD)
Green LED OFF, Red LED Solid ON (Latched)
Internal regulation feedback loop failure or auxiliary bias fault causing DC bus voltage to exceed High Voltage Shutdown threshold (typically >59.5VDC), latching the rectifier off.
1. Disconnect AC input to the module or pull the module partially from the slot for at least 60 seconds to discharge internal DC bus capacitors and reset the latch. 2. Verify system controller (e.g., PSC 3 or CSU) float/boost voltage targets to ensure correct configuration. 3. Reseat module and re-energize; if red OVP LED relatches immediately, internal secondary-side regulation is compromised and the rectifier must be replaced.
OTP_SHUTDOWN (Overtemperature Protection Shutdown)
Yellow LED Flashing then Solid ON, Green LED OFF
Internal heatsink temperature exceeded upper safety limit (>105°C) caused by obstructed front air intake, extreme ambient temperature, or blocked exhaust.
1. Clean and clear the front intake perforated panel and internal dust filters; ensure at least 100mm unrestricted airflow clearance front and back. 2. Verify site HVAC and shelter temperature to ensure operating ambient is below 45°C. 3. Allow module to cool down below auto-recovery threshold (~85°C); verify that output restores automatically. If the condition persists at ambient room temp, replace internal temperature sensor or module.
FAN_FAULT (Internal Cooling Fan Failure / Stalled)
Red LED Flashing (1Hz), Yellow LED Solid ON
Internal DC brushless fan mechanical seizure, bearing failure, or tachometer speed pulse feedback signal missing/below threshold.
1. Power down the module and inspect fan impeller visually for foreign debris or cable obstruction; gently rotate blades manually to check for bearing seizure. 2. Withdraw the module and inspect the internal fan wire harness and PCB connector for loose seating or damage. 3. If free of mechanical blockage and connections are intact but fan fails to spin or clear alarm on power-up, replace the fan assembly or the entire rectifier module.
CAN_COMM_FAIL (CAN Bus Communication Loss / Sharing Error)
Yellow LED Solid ON, Green LED Solid ON (Autonomous Mode)
Physical break in the CAN bus link between rectifier and controller (PSC 3/CSU), missing/faulty termination resistor, or CAN address conflict, causing module to fall back to standalone default voltage.
1. Check controller (PSC 3) display menu to verify if the rectifier slot reports 'Offline' or 'Comm Lost'. 2. Inspect CAN bus inter-shelf cabling, RJ45 patch cords, and verify 120-ohm bus termination resistors are properly seated. 3. Reseat the rectifier firmly into its slot. If communication is not restored, swap module into a known good slot to determine whether the fault is in the internal CAN transceiver or the backplane harness.

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