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DPC DZY-48/50H III Telecom Rectifier Module Equipment information & support

The DPC DZY-48/50H III is an industrial-grade 2900W -48V/50A switch-mode telecom rectifier module designed for BTS and DC plant cabinets. Utilizing full digital DSP control and soft-switching topology, it converts 85V~300V AC utility power into stabilized -48V DC, supporting hot-swap insertion and active autonomous current sharing.

Equipment information

Brand
Dpc
Equipment model
DPC DZY-48/50H III Telecom Rectifier Module
Equipment type
DC power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
DPC DZY-48/50H III Telecom Rectifier Module -48V 50A 2900W Hot-Swappable PSU

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

Rated Output Power
2900W industrial telecom-grade rated output power
Nominal DC Output Voltage
-48V DC (float/equalize charge range -42V to -58V DC)
Rated Output Current
50A continuous stable high-current supply
Power Conversion Efficiency
≥ 95.5% digital high-frequency soft-switching conversion efficiency
AC Input Voltage Range
85V AC to 300V AC (ultra-wide single-phase AC adaptive)
Hot-Swap Capability
Fully digital intelligent hot-swappable design with autonomous current sharing control

Alarms & troubleshooting

AC_IN_ERR (AC Mains Input Abnormal/Loss)
Green POWER LED OFF, Yellow ALARM LED solid ON, Red FAULT LED OFF
Mains utility outage, AC voltage out of operational window (<85VAC or >300VAC), tripping of AC input MCB, or loose input terminal connection
1. Measure AC input terminal voltage (L-N) at the backplane slot using a true-RMS multimeter to verify voltage within 85-290VAC. 2. Verify the AC sub-distribution breaker and upstream surge protective device (SPD) disconnect switches are closed. 3. Inspect terminal block connections for loose screws, thermal discoloration, or phase failure. 4. If AC grid is verified normal, reseat the module and check rear blind-mate hot-swap connector pins for mechanical deflection or arcing damage.
DC_OVP_LOCK (DC Output Overvoltage Lockout)
Green POWER LED flashing, Yellow ALARM LED OFF, Red FAULT LED solid ON
Internal voltage feedback loop open-circuit, PWM controller malfunction, or back-fed high voltage from a faulty paralleled module, causing DC output to exceed hardware threshold (59.5V ±0.5V)
1. Disconnect the module's AC feed breaker, wait 3 minutes for internal DC link bus capacitors to fully discharge, then re-energize to reset the latch. 2. If the red FAULT LED immediately latches ON upon restart, measure the system DC bus actual voltage with a calibrated digital multimeter. 3. If DC bus is normal (~53.5V), the fault is isolated to the internal sensing circuit or secondary stage of this unit; replace module. 4. If system DC bus is uniformly elevated, audit Central Supervisory Unit (CSU) float voltage setting.
OTP (Heatsink Over-Temperature Protection)
Green POWER LED solid ON, Yellow ALARM LED solid ON, Red FAULT LED OFF (derating mode; solid RED if shutdown limit exceeded)
Telecom room ambient temperature exceeds 55°C, front air intake dust filter severely clogged, blocked rear exhaust channel, heatsink dust accumulation, or faulty internal NTC sensor
1. Check room air conditioning status and measure ambient/exhaust air temperature gradient with an infrared thermometer. 2. Inspect cabinet front dust filter; clean or replace mesh to guarantee unrestricted airflow through the power shelf. 3. Unseat module and use clean compressed air / ESD-safe vacuum to remove dust buildup from internal heatsink fins and semiconductors. 4. Allow module to cool for 15 minutes and reseat; if overtemperature re-triggers rapidly under nominal ambient temperature, replace the module due to degraded internal thermal sensing.
FAN_FAIL (Cooling Fan Stall/Tachometer Fault)
Green POWER LED solid ON, Yellow ALARM LED flashing (1Hz), Red FAULT LED solid ON
Physical debris obstructing fan blades, mechanical bearing seizure, disconnected fan power harness, or loss of internal Hall/tachometer feedback signal to the MCU
1. Visually inspect the front panel air intake to verify whether foreign objects are physically jamming fan impellers. 2. Illuminate fan housing while operational to observe if both fans or only a single fan stopped running. 3. Disconnect and withdraw the module; spin blades gently with an insulated tool to check for mechanical bearing friction or resistance. 4. If blades rotate freely without friction but tachometer alarm persists upon power-up, the internal Hall sensor or 12V PWM drive circuit has failed; replace the fan assembly or entire rectifier.
COMM_FAIL (CAN-bus Communication Timeout/Current Share Fail)
Green POWER LED solid ON, Yellow ALARM LED slow flashing (0.5Hz), Red FAULT LED OFF
Poor contact on module rear CAN-bus gold-finger pins, Central Supervisory Unit (CSU) crash/power loss, missing 120-ohm CAN termination resistor, or address conflict ID on the bus
1. Verify Central Supervisory Unit (CSU) LCD/display is operational; reboot the CSU if it is unresponsive or unpowered. 2. Disengage module 10 cm from rack, inspect gold-finger CAN pins for bend or contamination, clean with isopropyl alcohol, and reseat firmly with latches secured. 3. Execute "Scan Rectifiers / Re-address Modules" command from the CSU menu interface. 4. Measure differential resistance across CAN_H and CAN_L lines with system powered down (normal nominal value is ~60 ohms for two parallel 120-ohm terminators); replace terminator if open-circuit.

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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