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Eltek Flatpack S 48/1800 HE Equipment information & support

The Eltek Flatpack S 48/1800 HE is an ultra-compact 1U, shallow-depth hot-swappable telecom rectifier module designed with advanced resonant soft-switching topology and digital control architecture, delivering 1800W nominal power at -48V DC with an outstanding 95.5% High Efficiency across an ultra-wide 85V to 305V AC input envelope.

Equipment information

Brand
Eltek
Equipment model
Eltek Flatpack S 48/1800 HE
Equipment type
DC power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
Eltek Flatpack S 48/1800 HE Telecom Rectifier Module 1800W -48V (241122.125) Official Studio Photo 3

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

Rated Output Power
1800W
Nominal DC Output Voltage
-48V DC (Adjustment Range: -43.5V ~ -57.6V DC)
Rated Output Current
37.5A (-48V DC)
AC Input Voltage Range
85V AC ~ 305V AC (Ultra-Wide AC Input Range)
Cooling Method
Built-in Ultra-Quiet Intelligent Fan
Physical Form Factor
Ultra-Slim Compact Plug-in Design (241122.125)

Alarms & troubleshooting

AC_MAINS_FAIL (AC Mains Failure/Out of Range)
Red Alarm LED solid on, Green Power LED off
AC input voltage below 85VAC or above 300VAC, input circuit breaker tripped, or phase feed disconnected.
1. Measure AC input terminal voltage at the rear backplane slot using a True-RMS multimeter. 2. Inspect corresponding AC branch circuit breaker and upstream surge protective device (SPD). 3. If input is within normal 85-300VAC range and breaker is closed, reseat the rectifier; replace if fault persists.
OUT_OVP_LOCK (DC Overvoltage Shutdown / HVSD)
Red Alarm LED solid on, Green Power LED off
Rectifier internal output voltage exceeded selective overvoltage threshold (typically >59.5VDC), triggering selective hardware latch-off protection to prevent load damage.
1. Disengage and pull the module partially out from the subrack to discharge and reset the internal latch circuit. 2. Measure the common DC bus voltage to ensure external power sources are not back-feeding overvoltage. 3. Wait 30 seconds and reinsert the module firmly; if HVSD triggers immediately again upon reboot, the internal regulation loop is defective and the unit must be replaced.
OVER_TEMP_SHUTDOWN (Heatsink Thermal Shutdown)
Yellow Warning LED solid on, Red Alarm LED solid on, Green Power LED off
Internal primary heatsink temperature exceeded safety cutoff limit (>85°C) caused by obstructed air intake, HVAC failure, or excessive ambient heat.
1. Check equipment room HVAC operation and verify ambient inlet temperature does not exceed 55°C rated limit. 2. Inspect front intake grilles and rear chassis exhaust; clean heavy dust using ESD-safe dry compressed air. 3. Allow heatsink to cool below reset threshold (~70°C) and verify automatic recovery; if issue recurs under low ambient temp, inspect fan tachometer or internal thermistor.
FAN_FAIL (Cooling Fan Speed Failure / Stalled)
Yellow Warning LED solid on, Red Alarm LED flashing
Fan tachometer hall feedback lost, rotor mechanically jammed by debris, PWM driver circuit failed, or bearing seized below RPM threshold (module derates output to 50%).
1. Unlatch and remove the rectifier; visually inspect fan blades through the front bezel for foreign objects or cable obstruction. 2. Spin the impeller manually to ensure smooth rotation with no bearing resistance or friction noise. 3. Reseat the unit to initiate power-on self-test; if fan fails to spin or Smartpack controller still reports low RPM, replace the fan assembly or entire rectifier.
CAN_COMM_FAIL (CAN Bus Communication Lost)
Yellow Warning LED flashing, Green Power LED solid on, Red Alarm LED off
CAN bus communication lost between module and Smartpack S controller, rear backplane connector pin misalignment, or missing bus termination resistor (rectifier falls back to autonomous safe-mode default voltage).
1. Check Smartpack S controller status to ensure the supervisory unit is powered, responsive, and not rebooting. 2. Pull the rectifier and inspect rear blind-mate connector pins for physical damage, bent pins, or contaminants. 3. Insert the unit into an adjacent slot; if comms recover, troubleshoot the backplane slot; if comms fail across all slots, upgrade rectifier firmware or replace the module.

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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