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Dpc / DC power systems

DPC 9U Large Embedded Telecom DC System Equipment information & support

The DPC 9U Large Capacity Embedded DC Power System is a 19-inch rackmount telecom power plant rated at -48V 300A, featuring 6 hot-swappable 50A rectifier bays, heavy-duty copper busbar distribution, and an intelligent digital supervisory controller.

Equipment information

Brand
Dpc
Equipment model
DPC 9U Large Embedded Telecom DC System
Equipment type
DC power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
DPC 9U Large Embedded Telecom DC System Official Product View 1

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

System Output Capacity
300 A
Nominal Output Voltage
-48 VDC
Output Voltage Range
-42 ~ -58 VDC
AC Input Voltage Range
90 ~ 290 VAC (3-Phase 5-Wire)
Rectifier Module Slots
6 slots (compatible with DPC 50A high-frequency rectifiers)
System Monitoring Controller
DK04 with LCD display and Ethernet port

Alarms & troubleshooting

AC_FAIL (AC Mains Input Loss / Phase Failure)
CSU Alarm LED solid red, Rectifier AC green LED OFF, Rectifier fault red LED solid
Grid outage, upstream AC circuit breaker tripped, loose terminal connections, or phase voltage dropped below 85 VAC
1. Measure phase-to-phase and phase-to-neutral voltages at the 9U AC distribution terminals using a digital multimeter. 2. Inspect and reset upstream external breakers and system integrated AC input MCBs. 3. Check AC input contactor coils and terminal torque; verify clearance on CSU display once AC supply stabilizes.
DC_HVSD (DC Bus Overvoltage Hardware Shutdown)
CSU Alarm LED solid red, buzzer sounds continuously, faulty rectifier protection yellow and fault red LEDs solid
Internal rectifier feedback loop failure causing runaway output, exceeding the bus HW protection threshold (59.5V ± 0.5V)
1. Check CSU live telemetry to locate the faulty rectifier delivering excessive runaway current and unlock/unseat it. 2. Measure the physical -48V DC busbar voltage with a calibrated digital multimeter. 3. Reseat the removed module after a 5-minute power discharge; if HVSD recurs immediately, replace the rectifier module.
BATT_LVD (Battery Low Voltage Disconnect Active)
CSU Alarm LED flashing red (1Hz), LVD Contactor status LED amber solid, corresponding DC load/battery LED OFF
Prolonged AC blackout discharging battery below cutoff threshold (default 43.2V), or open circuit in LVD contactor coil
1. Connect a mobile emergency diesel generator (EDG) to restore AC input and commence battery float recharging. 2. Measure terminal voltage across the battery strings and verify LLVD/BLVD disconnect setpoints in CSU parameters. 3. If AC is normal but contactor stays open, check drive board fuses and operate the emergency manual contactor bypass switch.
CAN_COMM_FAIL (Rectifier CAN Bus Comms Loss & Load Share Imbalance)
Rectifier Comms LED flashing yellow (0.5Hz), CSU controller Major Alarm yellow LED solid
Loose internal backplane CAN ribbon cable, failed CAN transceiver, missing 120-ohm termination resistor, or address collision
1. Check and firmly seat the RJ45/flat CAN communication harness connecting the CSU to the 9U subrack backplane. 2. Power down signal circuit and measure resistance between CAN_H and CAN_L; verify it reads 55 to 65 ohms. 3. Execute module re-polling on the CSU; re-seat non-communicating rectifiers and replace interface card if fault remains.
SPD_FAIL (Surge Protective Device Failure / Degraded)
SPD physical inspection window turned red, CSU Warning/Minor yellow LED solid
High lightning surge current triggering thermal disconnect of MOV varistor cartridges, or loose auxiliary alarm dry contacts
1. Visually check AC and DC SPD inspection windows in the 9U chassis to identify which plug-in cartridge shows red. 2. Verify the SPD dry contact signal terminal block wiring continuity back to the CSU sensor input board. 3. Open the SPD protective branch MCB, pull out and replace the damaged plug-in varistor cartridge with matching specs (e.g., In 20kA / Imax 40kA), then re-engage the MCB.

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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