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ZTE / DC power systems

ZXD2400 (V4.3) Equipment information & support

The ZTE ZXD2400 (V4.3) is a digital AC/DC rectifier utilizing phase-shifted topology to convert single-phase AC to filtered -48V DC power with autonomous load sharing and zero-arcing hot swappability.

Equipment information

Brand
ZTE
Equipment model
ZXD2400 (V4.3)
Equipment type
DC power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
ZXD2400 (V4.3) Official Product View 2

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

Nominal DC Output Voltage
-48 V DC
Rated Output Current
50 A
Power Conversion Efficiency
92.0 %
Physical Dimensions Spec
132 × 85 × 287 mm
AC Input Voltage Range
85 ~ 290 V AC
Operating Temperature
-25 ~ +70 °C

Alarms & troubleshooting

AC_IN_FAIL (AC Input Abnormal)
IN (Green LED) OFF, ALM (Yellow LED) solid ON
Mains outage, AC input undervoltage (<80VAC), overvoltage (>300VAC), or tripped AC input breaker.
1. Measure the AC line voltage at the subrack backplane input connectors with a DMM to ensure it is within 80VAC–300VAC. 2. Verify that the AC branch circuit breaker dedicated to the rectifier in the ACDU is closed. 3. If input voltage is normal but the rectifier fails to power up, reseat the module and inspect the rear connector pins for damage; replace the module if fault persists.
OUT_OVP (DC Output Overvoltage Lockout)
FAULT (Red LED) solid ON, OUT (Green LED) OFF
Internal PWM loop regulation failure or voltage feedback sensor drift, causing DC output to exceed hardware HVSD threshold (59.5V ± 0.5V).
1. Disconnect the rectifier AC breaker or extract the module; wait 3 minutes to discharge internal bus capacitors. 2. Reinsert the module and power on, observing whether output voltage normalizes (53.5V–56.4V). 3. If the FAULT red LED lights up again immediately, internal component failure has occurred; replace the module and send the defective unit for RMA repair.
TEMP_SHUTDOWN (Over-Temperature Shutdown)
ALM (Yellow LED) blinking or FAULT (Red LED) solid ON, OUT (Green LED) OFF
Internal heatsink temperature exceeded thermal threshold (>85°C) caused by blocked air intake, heavy dust accumulation, or high ambient temperature (>55°C).
1. Inspect the front air intake grilles and cabinet dust filters; remove accumulated dust and any airflow obstructions. 2. Verify the shelter/room HVAC operational status to ensure ambient temperature is maintained within +15°C to +30°C. 3. Allow the rectifier to cool down; it will auto-recover when heatsink temperature falls below 75°C. Replace the module if thermal sensors are drifting.
FAN_FAIL (Fan Blocked / Speed Fault)
ALM (Yellow LED) solid ON, OUT (Green LED) solid ON or derating
Internal cooling fan bearing seized, fan blades jammed by foreign material, or fan tachometer PWM speed signal lost.
1. Visually check whether the fan behind the front panel is stopped or rotating abnormally slow, and verify no foreign objects are jamming it. 2. Remove the module and gently spin the fan blades using an insulated probe to confirm free mechanical rotation without resistance. 3. Blow clean with compressed dry air and re-insert module; if the fan fails to start upon boot or alarm persists, replace the fan assembly or the entire rectifier.
COMM_FAIL (CAN Bus Comm Fail & Current Share Error)
ALM (Yellow LED) flashes slowly at 0.5Hz, OUT (Green LED) solid ON
Poor contact on rear backplane CAN pins, central supervisory unit (CSU) offline, missing CAN termination, or active current sharing imbalance exceeding 10%.
1. Check the CSU monitor screen to verify if the rectifier module slot is registered offline or has an address conflict. 2. Loosen front retention screw, firmly unseat and reinsert the rectifier to secure backplane pin connections. 3. Swap the module with an adjacent functioning slot to isolate whether the issue is backplane CAN wiring or the internal rectifier comm board; replace module if comm remains dead.

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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