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ZTE / DC power systems

ZXD2400 (V4.1) Equipment information & support

ZTE ZXD2400 (V4.1) is an industry-standard 2400W switch-mode telecom rectifier delivering -48VDC/50A with active PFC and high-reliability soft-switching design.

Equipment information

Brand
ZTE
Equipment model
ZXD2400 (V4.1)
Equipment type
DC power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
ZXD2400 (V4.1) Official Product 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 ~ 290VAC (Nominal 220VAC) VAC
Nominal DC Output Voltage
-48 V DC
Cooling Method
Built-in dual temperature-controlled fans with forced-air cooling

Alarms & troubleshooting

AC_IN_FAIL (AC Input Abnormal/Failure)
POWER LED (Green) Off, ALARM LED (Yellow) Solid/Flashing, FAULT LED (Red) Off
Mains power outage, AC input voltage outside operating range (<80VAC or >300VAC), or AC input breaker tripped.
1. Measure AC voltage across L/N terminals on the subrack backplane using a multimeter to confirm it is within 80VAC-300VAC. 2. Verify that the corresponding AC branch circuit breaker in the AC distribution unit (ACDU) is closed; inspect for downstream shorts before resetting if tripped. 3. If input voltage is verified normal, re-seat the rectifier module to check for connector pin damage; replace the module if fault persists.
OUT_OVP (DC Output Overvoltage Lockout)
POWER LED (Green) Off, ALARM LED (Yellow) Off, FAULT LED (Red) Solid On
Internal voltage regulation/feedback loop failure, causing DC bus voltage to exceed hardware threshold (59.5V ±0.5V), triggering latching shutdown.
1. Check fault logs via the Central Supervisory Unit (CSU). Disconnect module AC input or pull out module; wait 3 minutes for capacitor discharge. 2. Reinsert the module or turn AC power back on. If FAULT LED turns solid red immediately and output shuts down, internal regulator failure is confirmed. 3. Hot-swap with a spare ZXD2400 module and mark the defective unit for internal board servicing/calibration.
OTP_ALM (Over-Temperature Protection & Shutdown)
POWER LED (Green) Off, ALARM LED (Yellow) Solid On, FAULT LED (Red) Solid On
Ambient temperature exceeding 55°C, clogged cabinet air filters, blocked internal airflow, or heatsink temperature sensor exceeding thermal limit (>85°C).
1. Inspect site air conditioning and adjust ambient room temperature back to nominal range (20°C to 25°C). 2. Remove and clean the cabinet dust filters and the front grille intake vents of the rectifier module to clear obstructions. 3. Verify exhaust area at the rear is unobstructed; wait for heatsink to cool below reset threshold to verify auto-recovery.
FAN_FAIL (Fan Locked-Rotor/Speed Fault)
POWER LED (Green) Blinking/Off, ALARM LED (Yellow) Solid On, FAULT LED (Red) Blinking/Solid On
Internal DC cooling fan mechanically obstructed/jammed, fan motor driver circuit burned out, or tachometer speed sensor wire disconnected.
1. Visually check fan blades through the intake grille for debris; with power off, manually spin blades to ensure free rotation. 2. Re-seat module and listen during startup test: if fan does not spin up during power-on self-test, internal fan driver or motor is damaged. 3. Replace the cooling fan assembly or swap the entire rectifier module; never run the module loaded without forced-air cooling.
COMM_FAIL (CAN Communication Loss & Current Share Fault)
POWER LED (Green) Solid On, ALARM LED (Yellow) Slow Flashing (0.5Hz), FAULT LED (Red) Off
CAN-bus physical pin disconnect on backplane, faulty CAN transceiver IC, mismatched bus termination, causing module to fall back to autonomous 53.5V float mode.
1. Check the CSU monitor screen to verify whether only this module lost communication or all rectifiers dropped offline. 2. If isolated to one module, remove it and inspect CAN-H/CAN-L pins for corrosion or mechanical bend; clean and re-seat. 3. If all modules show comm loss, power down CSU and measure resistance between CAN-H and CAN-L (nominal ~60Ω with two 120Ω termination resistors).

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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