Vertiv / Telecom Site Energy Solutions

NetSure 2100 A31-S2 Equipment information & support

The Vertiv NetSure 2100 A31-S2 is an ultra-compact 19-inch subrack telecom DC power system engineered for -48V 120A applications with 85Vac~300Vac operating range.

Equipment information

Brand: Vertiv
Equipment model: NetSure 2100 A31-S2
Equipment type: Telecom Site Energy Solutions
Controller / software version: Confirm against the installed equipment

View full product specifications

NetSure 2100 A31-S2 Official Product View 1

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

System Output Capacity: 120 A
Nominal Output Voltage: -48VDC (-42V ~ -58V) VDC
Output Voltage Range: -48VDC (-42V ~ -58V) VDC
AC Input Voltage: 85 ~ 300 VAC (single-phase/two-phase compatible)
Rectifier Module Slots: 3 Slots
System Monitoring Controller: M221S / M222S intelligent comprehensive monitoring unit

Alarms & troubleshooting

AC_FAIL (AC Mains Failure/Abnormal)

Controller Alarm LED solid Red; Rectifier AC Green LED OFF, Yellow LED solid ON

Utility grid blackout, AC input circuit breaker tripped, loose terminal wiring, or AC voltage out of rectifier tolerance (<85VAC or >300VAC).

1. Verify utility supply voltage is within operational range (85-300VAC) using a digital multimeter. 2. Inspect the AC input circuit breakers and AC surge protective device (SPD) window status. 3. Measure terminal voltage at the backplane rectifier slots to verify wiring integrity and eliminate loose phase connections.

DC_HVSD (DC High Voltage Shutdown/Lockout)

Controller Alarm LED solid Red; Faulty rectifier Fault LED solid Red with zero output

Internal rectifier voltage loop control circuit failure, external DC source voltage backfeed, or incorrect overvoltage threshold settings in the controller (>58.5VDC).

1. Access controller menu to verify measured bus voltage and compare against the HVSD threshold configuration. 2. Disconnect/unseat rectifiers individually to identify the runaway unit causing bus overvoltage. 3. Cycle AC power to the locked rectifier to reset internal latch; if HVSD recurs immediately, replace the faulty rectifier module.

DC_UV_BLVD (Battery Low Voltage Disconnect)

Controller Alarm LED solid Red, continuous buzzer, DC contactor status indicator shows OPEN

Prolonged utility outage causing deep battery discharge down to disconnection threshold (e.g., 43.2VDC), activating the BLVD contactor to prevent cell damage.

1. Restore utility grid power immediately or deploy a portable diesel generator to feed the subrack. 2. Monitor rectifier ramp-up and confirm the controller automatically re-engages the BLVD contactor once bus voltage rises above recovery setpoint. 3. If bus voltage recovers (>48VDC) but the contactor fails to close, verify the coil driver fuse and check the manual override toggle.

REC_COMM_FAIL (Rectifier CAN Bus Comm Lost)

Controller Alarm LED solid Amber; affected Rectifier Yellow LED blinking at 0.5Hz

CAN-bus pin misalignment/oxidation on backplane slot connector, controller CAN transceiver defect, terminating resistor failure, or module slot address contention.

1. Unseat the faulty rectifier and inspect backplane connector pins for bent pins, dust contamination, or oxidation. 2. Firmly reseat the rectifier and controller, ensuring the mechanical retaining latches engage fully. 3. Swap the affected module into an adjacent known-good slot; if fault follows the module, replace it; if it stays with the slot, replace the subrack backplane.

REC_FAN_FAIL (Rectifier Fan Fault/Thermal Derating)

Controller Alarm LED solid Amber; Rectifier Yellow LED solid ON, fan halted or buzzing

Cooling fan rotor stalled by foreign debris, bearing wear failure, or air filter clogged causing tachometer RPM below threshold and triggering thermal output power derating.

1. Inspect the rectifier front intake grille and remove external dust accumulation or obstructing debris. 2. Clean internal airflow channel using dry compressed air; manually spin fan blades with an insulated tool to verify free rotation. 3. Cycle AC power to the rectifier; if the fan fails the startup RPM self-test or stays stalled, replace the fan assembly or swap out the rectifier 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

Share on-site information

01
Identify the exact model
Record the nameplate, system model and controller or module model.
02
Keep the alarm details
Record the full alarm text, indicator colour, timing and whether it persists.
03
Describe recent changes
Note recent replacements, software updates or configuration changes.

Record information visible in the existing interface. Electrical measurements, disassembly and replacement should follow the applicable manufacturer's manual and be performed by qualified personnel.