Delta / DC Power Systems (-48V)

ESR-48/56G Equipment information & support

The Delta ESR-48/56G is Delta's flagship ultra-high-efficiency telecom rectifier delivering -48V 56A (3200W) with an outstanding 96.8% peak efficiency, engineered for high-demand 5G cellular base stations.

Equipment information

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

View full product specifications

Delta ESR-48/56G Ultra-High Efficiency Rectifier Module (48V 56A 3200W Gold) - Rear Backplane & Terminals View

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

Rated DC Output Current: -48VDC (-42V ~ -58V)
Rated Output VA / Wattage: 3200W High Power Density
Nominal DC Output Voltage: -48VDC (-42V ~ -58V)
AC Input Voltage: 85V - 300V AC Wide Grid Tolerance
Cooling Architecture: Long-Life Brushless Speed-Regulated Fan
Peak Energy Efficiency: 96.8%

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.

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