R48-2000e3 Equipment information & support
The R48-2000e3 is a high-efficiency power system designed for telecommunication facilities and industrial infrastructure.
Equipment information
- Brand
- Vertiv
- Equipment model
- R48-2000e3
- Equipment type
- DC power systems
- Controller / software version
- Confirm against the installed equipment
Information below comes from the current product catalogue. Confirm the controller, software version and configuration of the installed equipment separately.
- Power Conversion Efficiency
- ≥96.2%
- AC Input Voltage Range
- 85VAC ~ 300VAC
- Nominal DC Output Voltage
- -42VDC ~ -58VDC (Nominal -48VDC)
- Cooling Method
- Front-to-rear air cooling with a temperature-controlled DC fan
Alarms & troubleshooting
AC_IN_FAIL / AC_DERATE (AC Input Abnormal / Loss / Voltage Derating)
Power LED (Green) OFF or flashing; Protection LED (Yellow) steady ON; Fault LED (Red) OFF.
Utility grid blackout, phase loss, loose terminal wiring, or AC input voltage out of operating envelope (<85 VAC causes linear derating or low-voltage cutoff, >290 VAC triggers overvoltage protection).
1. Measure L-N AC voltage at the rectifier slot backplane connector using a True-RMS digital multimeter;
2. Verify AC supply is within the operational range of 85 VAC to 290 VAC;
3. Inspect the upstream AC circuit breaker (MCB) for trip conditions;
4. Retorque AC terminal screws and check for loose neutral connection;
5. If AC input is nominal but module protection LED persists, reseat the module and inspect gold-finger contacts; replace module if defective.
DC_OV_LOCKOUT / HVSD (DC Output Overvoltage Lockout / High Voltage Shutdown)
Power LED (Green) OFF; Fault LED (Red) steady ON (latched); Protection LED (Yellow) OFF.
Internal PWM loop failure, optocoupler feedback breakdown, or bus transient voltage exceeding the hardware High Voltage Shutdown (HVSD) setpoint (typically 59.5 VDC ± 0.5 V). Module latches off to protect telecom loads.
1. Extract the faulted rectifier module from the subrack and trip its AC feed;
2. Wait at least 3 minutes to allow internal high-voltage capacitors to fully discharge;
3. Reinsert the module firmly and re-apply AC power to execute a cold hardware reset;
4. Verify via supervisory controller (e.g., M500S/M830B) that float/equalize target voltage is not misconfigured (>58.5 VDC);
5. If the module instantly relatches with red LED upon restart, internal voltage regulation has failed; replace the unit.
OTP_DERATE / OTP_SHUTDOWN (Over-Temperature Derating & Thermal Shutdown)
During derating: Power LED (Green) steady ON, Protection LED (Yellow) steady ON; During thermal shutdown: Power LED OFF, Protection LED (Yellow) ON/flashing, Fault LED (Red) steady ON.
Ambient temperature exceeding 55°C, clogged cabinet air filters, reverse hot-air recirculation, or internal heatsink thermistor (NTC) detecting power MOSFET/PFC junction temperature exceeding design safety threshold (>105°C triggers shutdown).
1. Check site HVAC cooling system to guarantee subrack intake temperature is below 35°C;
2. Remove and clean cabinet front intake dust filters using compressed air or vacuum;
3. Inspect subrack air baffles and install blanking panels over empty slots to avoid hot air loops;
4. Allow module heatsink to cool; verify Protection LED clears and module re-engages normal output automatically;
5. If intake air is cool and fan spins properly but over-temperature persists, replace module due to degraded heatsink paste or faulty internal NTC.
FAN_FAULT / SPEED_ABNORMAL (Fan Blocked / Airflow Restriction Fault)
Fault LED (Red) flashing (0.5 Hz to 1 Hz); Protection LED (Yellow) steady ON or flashing; Power LED (Green) steady ON.
Internal brushless DC fan impeller mechanically stalled by foreign debris, bearing seizure, or loss of tachometer pulse (Hall sensor open-circuit), resulting in measured RPM dropping below 70% of target duty-cycle.
1. Visually inspect the front grille of the module to verify if the impeller is physically jammed by cables or debris;
2. De-energize module and spin blades gently using a non-conductive probe to verify free mechanical rotation;
3. Re-power module and observe self-test rotation; unusual grinding noise indicates bearing wear;
4. Unscrew front bezel and verify 4-pin fan connector is firmly seated on the internal PCB header;
5. If obstruction is cleared and connections are intact but the fan fault persists, replace the fan assembly or swap the module.
CAN_COMM_FAIL / I_SHARE_ERR (CAN-bus Communication Lost & Active Current Share Failure)
Power LED (Green) flashing (0.5 Hz); Protection LED (Yellow) flashing; Fault LED (Red) OFF.
CAN_H / CAN_L differential line open circuit, oxidized backplane signal connector pins, missing 120-ohm bus terminating resistor, or autonomous current-share circuit fault causing module output imbalance (>10% deviation from average).
1. Check SCU/controller display to see if a single rectifier is offline or the entire CAN bus has failed;
2. Reseat module and clean the backplane communication gold pins with isopropyl alcohol;
3. Measure resistance across CAN_H and CAN_L with power off (nominal value should be ~60 ohms due to dual parallel 120-ohm terminations);
4. Verify if module falls back to standalone default autonomous output (53.5 VDC);
5. Swap module to an adjacent slot; if the fault follows the module, internal CAN transceiver (PCA82C250/SN65HVD230) is damaged; replace 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.
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