PSH
High efficiency power supply
The needs
L’alimentazione elettrica dei nodi di rete decentralizzati (es. miniDSLAM, MSAN, DPU…), utilizzati sempre più diffusamente per la costruzione delle reti di telecomunicazioni a banda più larga, ha spinto gli operatori alla ricerca di sistemi d’alimentazione con caratteristiche adeguate a questo tipo d’applicazione.
Network devices, typically installed in street-side cabinets, require a local 48-60Vdc power supply which can be obtained from the connection to the electrical grid and the use of appropriate AC/DC converters.
To ensure the electrical safety requirements for these types of network systems and to minimize the installation, operating and maintenance costs, it’s required the use of class II AC/DC converters with overvoltage category 4 (OVC IV).
The output power required from these AC/DC converters is 420W without degrading performance up to operating temperatures of 70°C.
Another important required feature is a high efficiency to limit thermal dissipation and minimize energy waste with its consequent costs.
Even the compact dimensions and the mechanical resistance are important features, given the type of installation that are usually installed in small street side compartments.
Many AC/DC converters already present on the market rarely have all the required features, nor the specific conformations requested by the telco.
For these reasons, the SEMAR group designed a line of power supplies with features able to satisfy all the previous requirements.
The challenges
- Double insulation (class II) and overvoltage category 4 (OVC IV) for safe use without the need for earthing (avoids periodic checks and costs) or additional protection and disconnection devices.
- High efficiency in all load conditions, with low heat dissipation and energy costs
- Ultra-compact dimensions for multiple devices in reduced installations spaces
- Wide operating temperature range, useful for street side compartments exposed to sun and bad weather
- Absence of cooling fans for maximum reliability
- Resistance to mechanical stress (vibrations on street installations)
- Possibility of remote control and monitoring
The realization
The PSH480HE device of the PSH series is a class II and OVC IV ADC/DC converter, suitable for telco and industrial application needs.
Le caratteristiche del convertitore PSH480HE permettono di evitare l’utilizzo dell’interruttore differenziale, delle protezioni da sovratensione e del collegamento a terra nell’impianto in cui il convertitore viene utilizzato, garantendo comunque il livello di sicurezza e protezione elettrica richiesto dalle normative per impianti TELCO.
Il dispositivo PSH480HE fornisce una tensione d’uscita regolabile fra 48 e 59Vdc ed eroga una potenza di uscita massima di 480W in tutte le condizioni operative garantendo un’efficienza energetica pari o superiore al 95%.
The device is equipped with visual state indications and an output dry contact that can be activated on configurable conditions.
The functional configuration of the PSH480HE device (output voltage, current limitation, alarm signals...) and its status, statistics and historical events/alarms are accessible via a RS485 Modbus interface which can also be used for in-field firmware update.
- Input 100-240Vac
- Adjustable output 48-59Vdc
- Output power 480W
- Efficiency ≥ 95%
- Class II, category OVC IV
- Interface RS485 for configuration, status, statistics and events
- Configurable output dry contact
- DIN-rail mounting
- Compact dimensions (85x118x118 mm)
- Operative temperature from -20° to +70°C without performance loss
- Cooling by air convection
- Phoenix connectors for simple and easy connection and replacement
