Delta / DC Power Systems (-48V)

Delta ESR-48/56CN Equipment information & support

The Delta ESR-48/56CN is a high-performance, 3000W industrial-grade hot-swappable switch-mode rectifier module engineered for carrier-grade telecom macro stations and DC power systems. Featuring an advanced soft-switching topology and active digital PFC, it converts ultra-wide AC inputs ranging from 88V AC to 300V AC into a highly stabilized -48V DC (adjustable 42V~58V) output at 56A with an efficiency exceeding 94%, delivering superior power density and rugged environmental resilience.

Equipment information

Brand: Delta
Equipment model: Delta ESR-48/56CN
Equipment type: DC Power Systems (-48V)
Controller / software version: Confirm against the installed equipment

View full product specifications

Delta ESR-48/56CN 3000W 56A Telecom Switch Rectifier Module (-48V DC) Official Studio Photo 1

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

Rated Output Power: 3000W High Efficiency Output Power
DC Output Voltage: -48VDC (-42V ~ -58V)
Rated Output Current: 56A (-48V DC Continuous Constant Current)
AC Input Voltage Range: 88V AC ~ 300V AC (Nominal 220V AC)
Physical Form Factor: Standard Plug-in Hot-Swappable Module Design
Power Conversion Efficiency: ≥ 94%

Alarms & troubleshooting

AC_IN_FAIL / VOLT_ABNORMAL

Input Amber LED blinking, module in standby protection mode

Utility input voltage outside operating limits (<85VAC or >300VAC) or internal input fuse open

1. Measure AC line-to-neutral voltage at the module slot with a multimeter;\n2. Inspect corresponding subrack AC input circuit breaker status;\n3. If grid voltage is normal, extract module and examine rear gold-finger pins;\n4. Reseat into an adjacent empty slot to rule out backplane connector faults.

DC_OV_SHUTDOWN / LOCKOUT

Alarm Red LED solid, module output locked out with 0V DC

Internal voltage feedback loop fault caused output to exceed HW threshold (>59.5V), or external bus backfeed

1. Measure actual DC bus voltage to ensure no external overcharging backfeed;\n2. Open AC supply breaker and allow 60 seconds for internal capacitors to discharge;\n3. Power-cycle module; if red lockout recurs immediately, replace rectifier unit.

FAN_FAIL / OVER_TEMP

Temperature Amber LED solid, cooling fan halted or output power derated

Air filter clogged with dust, cooling fan bearing seized, or ambient temperature exceeds +75°C

1. Clear accumulated dust and debris from front ventilation slots and mesh;\n2. Inspect fan blades for mechanical obstruction and verify spin-up on boot;\n3. Check cabinet ventilation airflow and ambient air-conditioning operation;\n4. If fan remains stalled, replace with genuine speed-regulated brushless DC fan.

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

01
Identify the exact model
Record the nameplate, system model and controller or module model.
02
Keep the alarm details
Record the full alarm text, indicator colour, timing and whether it persists.
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.