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HEFENGQI / DC power systems

Zhongheng APR48-3G Rectifier Module Equipment information & support

The Zhongheng APR48-3G is a high-efficiency switched-mode telecom rectifier module engineered for access nodes and industrial networks, converting 90V-290V AC to stable -48V DC (1800W/33.3A) with full hot-swap capability and autonomous active load sharing.

Equipment information

Brand
HEFENGQI
Equipment model
Zhongheng APR48-3G Rectifier Module
Equipment type
DC power systems
Controller / software version
Confirm against the installed equipment
View full product specifications
Zhongheng APR48-3G 1800W 33A Telecom Switched-Mode Rectifier Module (-48V DC Hot-Swap)

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

Rated Output Power
1800W compact high-efficiency telecom rectifier output power
Nominal DC Output Voltage
-48V DC (nominal -54V DC, adjustable range -42V to -58V DC)
AC Input Voltage Range
90V AC to 290V AC (ultra-wide AC grid input range)
Hot-Swap Live Maintenance
Hot-swappable drawer structure, plug-and-play with digital automatic current sharing
Cooling Method
Built-in intelligent speed-controlled long-life ball bearing fan cooling
Power Conversion Efficiency
≥ 95.0% high-frequency switching conversion efficiency

Alarms & troubleshooting

AC_FAIL (AC Input Abnormal / Mains Fail)
Green LED OFF, Amber LED solid ON
Mains blackout, AC input voltage <85VAC or >300VAC, upstream AC breaker tripped, or blown internal input fuse.
1. Measure L-N voltage at the rectifier AC inlet using a true-RMS DMM (nominal: 85–300VAC). 2. Verify upstream AC feed breaker and terminal torque in the distribution unit. 3. Reseat the rectifier into the subrack slot; if the issue persists with valid AC, replace the module.
OUT_OVP (DC Output Overvoltage Lockout / HVSD)
Red LED solid ON, Green LED OFF
Internal PWM loop failure or optocoupler feedback breakdown causing DC output to exceed the hardware HVSD threshold (>59.5VDC nominal), latching the unit off.
1. Unseat the module from the shelf for 60 seconds to discharge bus caps and reset the hardware latch, then reinsert. 2. Verify the DC bus voltage reading on the supervisory controller to ensure external voltage is not high. 3. If the red LED re-engages immediately upon powering, internal power components are damaged; replace the module.
MOD_OTP (Module Over-Temperature / Thermal Shutdown)
Amber LED blinking (derating) or Red LED solid ON (shutdown), Green LED OFF
Ambient temperature exceeding operational limits (>65°C), front air inlet/dust filter choked, or blocked exhaust causing heatsink temperature to exceed safety threshold (>95°C).
1. Inspect site air conditioning and intake ambient temperature (nominal operating range: -5°C to +45°C). 2. Clean dust and debris from the front intake grille, rear louvers, and cabinet filter mats. 3. Allow the module to cool below recovery threshold (~55°C); the unit should auto-recover. If not, inspect the internal NTC thermistor.
FAN_FAIL (Cooling Fan Stall / Tacho Failure)
Amber LED solid ON, Green LED ON (module operating derated)
DC brushless cooling fan seized by mechanical bearing wear, debris blocking fan blades, loss of tachometer signal, or disconnected fan wiring harness.
1. Withdraw the rectifier module and visually inspect the fan impellers for mechanical blockages; spin by hand to check bearing resistance. 2. Verify that the fan header is securely latched into the internal PCB receptacle. 3. If the fan fails to spin under load after clearing obstructions, replace the fan sub-assembly or the module.
CAN_COMM_ERR (CAN-bus Communication & Current Share Loss)
Amber LED slow blink (0.5Hz), Green LED solid ON
Oxidized or bent CAN-H/CAN-L connector pins on the backplane, ID address conflict from CSU, or missing 120Ω bus terminator, leading to autonomous current share collapse.
1. Check the supervisory controller (CSU) menu to verify if the module ID shows offline or communication lost. 2. Withdraw the module and clean the rear gold-finger blind-mate connector with isopropyl alcohol, then firmly reseat and latch it. 3. Measure CAN bus resistance with system powered down (nominal: ~60Ω across CAN_H and CAN_L with both 120Ω termination resistors installed).

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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