Question 1

How do you calculate and select the DC cable cross-sectional area for the NetSure 212 C23-S2 -48V distribution loops?

Accepted Answer

Cable sizing must satisfy both continuous ampacity and maximum permissible loop voltage drop. Telecom engineering standards require total round-trip DC loop drop between the system busbar and load terminals to stay below 0.5V (absolute maximum 1.0V). The cross-sectional area is determined by: S = (2 * L * I) / (K * ΔV), where S is conductor area in mm², L is one-way route length in meters, I is maximum branch current in Amperes, K is conductivity (approx. 57 m/(Ω·mm²) for copper), and ΔV is allowable voltage drop in Volts. Select the nearest higher standard metric wire gauge and verify that its thermal current-carrying capacity under site ambient temperature exceeds 125% of the branch protective breaker rating.

Question 2

How should the Load Low Voltage Disconnect (LLVD) and Battery Low Voltage Disconnect (BLVD) thresholds be coordinated on the NetSure 212 C23-S2?

Accepted Answer

Coordinating two-stage Low Voltage Disconnects maximizes runtime for mission-critical radios while preventing permanent sulfation of batteries. For standard 48V VRLA battery strings (24 cells nominal), LLVD should be configured between 44.5V and 45.0V (approx. 1.85V to 1.88V per cell). When mains AC is lost and battery voltage drops to this trigger, auxiliary non-critical loads are disconnected. BLVD must be set strictly to 43.2V (1.80V per cell, the absolute end-of-discharge threshold for VRLA), opening the main battery contactor to prevent destructive deep discharge. Upon AC restoration, the controller re-engages contactors sequentially once the bus voltage recovers above the configured re-connect hysteresis (typically 48.0V).

Question 3

How do you configure the battery temperature compensation coefficient and baseline parameters on the NetSure 212 controller?

Accepted Answer

Access the M221S/M222S controller menu under: [Settings] -> [Battery Settings] -> [Temp Compensation]. Set the baseline temperature to 25°C. For standard AGM VRLA batteries, configure the compensation slope to -3.0 mV/°C/cell (amounting to -72 mV/°C for a 24-cell 48V string); for GEL batteries, configure -3.5 mV/°C/cell (-84 mV/°C per string). Set clamping voltage limits (e.g., minimum float clamping at 51.5V, maximum float clamping at 56.0V) to prevent over-voltage or under-voltage conditions on connected telecom hardware during seasonal temperature extremes. Verify that the physical temperature probe is attached to the center of the battery string at mid-height and calibrated.

Key specifications	Value
Smart Monitoring Controller	M225S / NCU Smart Controller
AC Input Voltage	85VAC ~ 300VAC (Nominal 220VAC) VAC
Cooling System Architecture	Temperature-controlled Forced Air Cooling
Nominal Output Voltage	-48VDC (-42V ~ -58V) VDC
Managed Rectifier Capacity	3 Slots for R48-2000e3 Rectifier Modules
Rated DC Output Current	120A (System Capacity 5.8kW)
Form Factor Dimensions (HxWxD)	88 (2U) × 482 × 330 mm
Peak Energy Efficiency	≥96.2%
Operating Temperature Range	-40°C ~ +65°C

Vertiv NetSure 212 C23-S2 Subrack High-Frequency DC Power System (-48V 120A 2U)

Talk to RICEWIND

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

Continue exploring

Vertiv BM-CM6S Online Battery Bank String Monitoring Module (Cell Internal Resistance & Voltage Telemetry)

Vertiv BMK1115601-006 Subrack Telecom DC Power System (-48V 200A 3U)

Vertiv ER22010-T High-Voltage DC Rectifier Module (220Vdc/10A Forced Air-Cooled Telecom & Utility Power)

Vertiv ER22020-T High-Power DC Rectifier Module (220Vdc/20A 4.4kW Utility Substations & DC Systems)

Vertiv NetSure 212 C23-S2 Subrack High-Frequency DC Power System (-48V 120A 2U)

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 calculate and select the DC cable cross-sectional area for the NetSure 212 C23-S2 -48V distribution loops?

How should the Load Low Voltage Disconnect (LLVD) and Battery Low Voltage Disconnect (BLVD) thresholds be coordinated on the NetSure 212 C23-S2?

How do you configure the battery temperature compensation coefficient and baseline parameters on the NetSure 212 controller?

How do you troubleshoot and resolve active load current sharing imbalance (> 10%) between parallel rectifiers?

Continue exploring

Vertiv BM-CM6S Online Battery Bank String Monitoring Module (Cell Internal Resistance & Voltage Telemetry)

Vertiv BMK1115601-006 Subrack Telecom DC Power System (-48V 200A 3U)

Vertiv ER22010-T High-Voltage DC Rectifier Module (220Vdc/10A Forced Air-Cooled Telecom & Utility Power)

Vertiv ER22020-T High-Power DC Rectifier Module (220Vdc/20A 4.4kW Utility Substations & DC Systems)