Question 1

How do you troubleshoot a flashing/solid yellow alarm LED and a 'CAN Comm Failure / Module Lost' alarm reported by the controller?

Accepted Answer

1. Verify the module is fully seated into the backplane connector and the mechanical latch is locked, inspecting pins for bent contacts or oxidation. 2. Measure CAN bus termination resistance with DC bus de-energized; across CAN_H and CAN_L, total resistance must be ~60 ohms (two parallel 120-ohm terminators). 3. If only one module fails to communicate, swap slots with a working unit: if the fault follows the module, the internal CAN transceiver/isolated interface is defective; if the fault remains at the slot, inspect backplane traces and connector pins.

Question 2

What is the operating logic during an Output Overvoltage Protection (OVP) shutdown, and what is the exact reset procedure?

Accepted Answer

The rectifier employs selective OVP: a primary software shutdown via CAN and an independent secondary hardware analog latch comparator (typically preset to 59.0V ±0.5V). When hardware OVP trips, PWM switching stops immediately, and the unit latches off with a solid red LED. Reset procedure: 1. Confirm whether external power sources caused bus voltage rise or an internal feedback loop failed. 2. Disconnect AC input power completely by opening the branch breaker or unlatching the rectifier from the shelf. 3. Wait at least 60 seconds for bulk DC link capacitors to bleed down below 5V. 4. Re-apply AC mains to release the hardware latch.

Question 3

What is the AC low-voltage output power derating characteristic, and how do you calculate available load capacity between 85 VAC and 185 VAC?

Accepted Answer

The module delivers full 3000W output power between 185 VAC and 275 VAC. Between 85 VAC and 185 VAC, output power derates linearly due to internal AC input current clamping (limited to ~17.5 A - 18.0 A RMS). At 85 VAC, available output power is derated to ~1380 W (approx. 28.7 A @ 48 VDC). The linear derating formula is: P_out(W) ≈ 1380 + (V_in - 85) × 16.2. In unstable low-voltage grid deployments, site engineers must size N+1 rectifiers based on lowest predicted AC grid voltage to avoid inadvertent battery discharge.

Key specifications	Value
Cooling System	Internal Temperature-Controlled Intelligent Variable Speed Fan
AC Input Voltage	85VAC ~ 300VAC (WOR Wide Operating Range)
Operating Efficiency Rating	≥96.5%
Operating Temperature Range	-40°C ~ +75°C
Rated Output Power Capacity	3000W (62.5A @ 48VDC)
Nominal DC Output Voltage	-48VDC (-42V ~ -58V)
Overall System Efficiency	Up to 96.2% (Gold Standard)
Acoustic Noise	≤ 55 dBA (at 25°C ambient load)
Ingress Protection Rating	IP20 (Indoor Dust & Finger Proof)
Dielectric Withstand Voltage	3000VAC Input to Ground (< 5mA)

Eltek Flatpack2 48/3000 WOR HE Rectifier Module (241115.705)

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What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Telecom 4G/5G macro cellular base stations and distributed remote power sites

Enterprise-grade cloud data center mission-critical -48V DC power distribution lineups

Utility power grid dispatch centers and high-voltage substation DC switchgear rooms

Railway transit signaling, automated train control, and communications equipment rooms

Frequently asked questions

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Eltek Flatpack2 48/3000 WOR HE Rectifier Module (241115.705)

Talk to RICEWIND

Clear support from selection to delivery

What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Telecom 4G/5G macro cellular base stations and distributed remote power sites

Enterprise-grade cloud data center mission-critical -48V DC power distribution lineups

Utility power grid dispatch centers and high-voltage substation DC switchgear rooms

Railway transit signaling, automated train control, and communications equipment rooms

Frequently asked questions

How do you troubleshoot a flashing/solid yellow alarm LED and a 'CAN Comm Failure / Module Lost' alarm reported by the controller?

What is the operating logic during an Output Overvoltage Protection (OVP) shutdown, and what is the exact reset procedure?

What is the AC low-voltage output power derating characteristic, and how do you calculate available load capacity between 85 VAC and 185 VAC?

When operating in harsh ambient conditions, if the rectifier triggers an Over-Temperature (OT) alarm and thermal shutdown, how should airflow and cooling faults be diagnosed?

Continue exploring

Eltek 252189 Subrack Telecom DC Power System (-48V 4-Slot Flatpack2)

Eltek Battery String Monitor (242100.300)

Eltek CT0S0201 Embedded Telecom DC Power Subrack System (-48V 150A-300A / Flatpack2 & Smartpack)

Eltek Flatpack S 48/1000 HE Ultra-Compact High-Efficiency Rectifier (-48V 1000W 1U)