NSD – POWER SUPPLY SYSTEMS
configurable DC power supply systems
Possibilities of configuration of the
NSD – POWER SUPPLY SYSTEMS
The NSD - DC power supply systems are suitable for a wide range of applications, especially in the field of telecommunications, where stable DC voltage is required. With a wide input voltage range and high temperature tolerance of the surrounding environment, the NSD systems can be deployed indoor as well as outdoor. The system is equipped with internal as well as external communication and enables load sharing among individual modules. The supply modules are of the HOT-PLUG type for easy maintenance and system extension. Thanks to the redundant backup power and remote control this system offers a very wide application range. The system can control from 1 up to 14 modules.
NSD-3K6
NSD POWER SUPPLY SYSTEMS
The NSD power supply system is a modular system of continuous DC supply equipped with remote monitoring and control. Continuous power supply is ensured with the use of backup accumulator batteries. The operation statuses of the accumulator battery are monitored and controlled by the master controller as well as individual rectifiers. This ensures maximum reliability of backup and long service life of individual components. Operation statuses of the system can be reported through advance and configurable alarm management.
The power supply system consists of rectifiers, the master controller, distribution unit and a low voltage disconnection unit designed for installation in a 19” subrack. On the basis of the customer’s requirement the above mentioned units can be used to assemble power supply systems from 1.2kW to 16kW with the height of 3U to 15U.
The rectifiers are switched AC/DC power supply units equipped with active PFC, the load share function, their own diagnostics and they are digitally controlled and monitored via a bus by the master controller (MC). The operation statuses of the rectifiers are also monitored optically (LED on the front panel).
In the basic version the power supply system is optimized for lead (VRLA) accumulator batteries with a capacity of 10 to 500Ah. To ensure optimum operation conditions of the battery a temperature sensor is available that is used by MC to check its temperature. MC controls all the system components in such a way to guarantee the best operation conditions of the battery with regard to its service life and readiness for backup. This includes an actively controlled charging process with monitoring of several parameters of the battery, including its temperature and current charging status. In the backup mode the system is able to transmit information about the current capacity of the battery (remaining backup time) and to protect the battery from damage due to deep discharge.
The distribution unit is divided into circuits that are separately protected and monitored. In case of overload of a circuit its protection responds and subsequently this event is registered by the master controller.
All the operation statuses of the system are monitored by the master controller (MC), which forwards this information in accordance with the applied configuration (locally with the use of relays or remotely through on-screen display, sending an e-mail or trap in the SNMP protocol). The administrator can monitor, manage and set a number of parameters of the entire system through a LAN or Internet.
COMPONENTS OF THE NSD POWER SUPPLY SYSTEMS
Master controller (MC)This is a microprocessor block that controls the other components of the system and takes care of communication with remote administration – supervision. With regard to the rectifiers it sets some of their parameters and monitors their operation condition (temperature, current loading, failure, etc.).
MC monitors the voltage and current values of the supply bus, the values of the output voltage, current and temperature. It sets alarm flags and shows information about the system on the monitoring screen of the connected PC. The master controller is able to serve up to 14 rectifiers connected to one power and data bus and to monitor 6 independently protected output circuits.
The local monitoring interface consists of 6 potential-free alarm outputs (relay contacts). The assignment of individual alarms to a certain relay is programmable (also during operation) via the remote monitoring. An alarm is reported by standstill.
MC makes it possible to assign internal flags of events to alarm relays or to e-mails. Any combination and grouping of flags is acceptable.
MC ensures charging, monitoring of the current status and disconnection of the battery if necessary. It allows planning and execution of an automatic functional (dynamic) test of the battery, incl. reporting of its result; it is able to provide for equalization of the battery on the basis of a planned event or after its activation by the remote monitoring. The monitoring also includes checking the current status of the protection element of the entire battery.
Battery management
The master controller manages charging of the battery using the IUoU characteristic. At the beginning of the process the charging current is controlled; when the charging voltage level is achieved at the battery, this voltage is maintained and the charging current gradually decreases. As soon as the current reaches 25% of the initial charging current value, the rectifiers reduce the charging voltage to the maintaining voltage. This way the battery is quickly charged and prevents gassing of the battery, which has a negative impact on its service life. They system administrator can set the charging current, charging voltage and maintaining voltage. Standard part of the battery management is low voltage disconnector.
Distribution
The power supply system contains a distribution module with output circuit-breakers that can be monitored. The system enables monitoring of max. 6 output circuits; each circuit may contain several protection elements - subcircuits).
Rectifier
The rectifiers (modules) can be arranged in parallel and they evenly share the output current (load) to achieve balanced loading and maximum service life. In case of a failure of one of the modules the other modules evenly share the increase current. The redundantly designed system is completely functional event if one rectifier fails. The administrator will receive a message about the failure of the rectifier and can arrange for its replacement without influencing the function of the system as a whole. The rectifiers are of the hot-swap type, i.e. the defective rectifier can be replaced with a new one during system operation. The JSD-600 and JSD-1200 rectifiers are not compatible and are exclusively designed for the corresponding power supply systems NSD-1K8 and NSD-3K6, respectively.
RECTIFIER FEATURES
R1200-48 rectifier Output current 24A
Input voltage 100-260VAC
Output voltage adjustable 40-60V DC
Active PFC
Two-stage conversion – low output voltage ripple
Very high efficiency >90%
Active cooling
Parallel operation
Hot Swap support
Control and diagnostics via a digital interface
Max. 14 modules connected in parallel.
Power derating (in relation to input voltage below 200V)
R600-48 rectifier
Output current 12A
Input voltage 100-260VAC
Output voltage adjustable 40-60V DC
Active PFC
Two-stage conversion – low output voltage ripple
Very high efficiency >91%
Passive cooling
Parallel operation
Hot Swap support
Control and diagnostics via a digital interface
OTHER POSSIBILITIES of electrical design of NSD systems
Inputs:100 – 260V (power derating below 200V input voltage) 380V – only 3+N phase
Outputs can be modified in relation to the battery:
40V – 58V with 48V battery 52V – 72V with 60V battery 94V – 125V with 110V battery
OPTIONAL DEVICES that can be included to the NSD systems
Switching unit of two galvanically isolated input mainsAn optional part of the system that allows you to connect two input AC mains with the possibility to select the preferred main. It will be used in standard operation and in case of its failure the system will automatically switch over to the backup main. The switching does not involve any time gap, i.e. the system need not be restarted.
Battery management unit
The unit is designed to measure the voltage of groups of battery cells (max.4) and to transmit these data to the NSD system. They are then periodically measured and shown on the monitoring screen of the system. The information can be used by the operator to find any differences in voltage between individual groups of battery cells and to decide whether corrective measures are necessary (equalization, cell replacement, ...).
Configuration of a fully equipped single unit with 4 modules:
NSD-3K6
DC power supply system 19”, 3U height, 3 power modules
with redundant power supply and TCP/IP remote monitoring
The NSD-3K6 DC power supply system is suitable for a wide range of applications, especially in the field of telecommunications, where stable DC voltage in the range from 48 to 54V is required. With a wide input voltage range (100 – 256V AC) and high temperature tolerance of the surrounding environment, the NSD systems can be deployed indoor as well as outdoor. The system is equipped with internal as well as external communication and enables load sharing among individual modules. The supply modules are of the HOT-PLUG type for easy maintenance and system extension. Thanks to the redundant backup power and remote control this system offers a very wide application range. The system can control up to 14 Modules.
NSD-3K6
Power supply modules
The power supply modules are digitally controlled. Their functions include switching on and off, active load sharing and display of operation and error messages. The HOT-PLUG function enables quick and simple replacement of individual modules or their quick addition to the system under full operation.
Monitoring and alarms
The MC module (Master Controller) is equipped with 6 programmable, potential-free contacts in the standard version. The SNMP version is also equipped with a communication module with the TCP/IP protocol, which makes the entire system easy to control. Each individual module has a LED indicator of the module status and errors on the front panel. The MC module in the SNMP version additionally allows you to display the system status with other measured parameters on a PC (e.g. current, voltage, temperature).
External communication
You can set and control several of parameters via the Internet. Some of the adjustable parameters are input voltage, alarms, disconnection voltage or battery test.
Load sharing
The distribution panel is used for connecting the battery and an appliance. The battery is additionally connected via a disconnector. The load can be connected via a circuit-breaker to up to nine output circuits. The battery connection and output circuits are controlled by the MC module.
Mechanical design
The system is designed for installation in a 19“ rack. Its height is 3U and it is designed for a simple connection using cables. It is also fitted with connectors accessible from the rear (battery, output, mains, temperature sensor, connections to other systems, potential free contacts). The power supply modules and MC module can be accessed and fitted from the front side. Also, the network connector (RJ45) is accessible from the front side.
The system can be individually configured!
Power supply system NSD–3K6–XXX_XM
Number of modules per unit (max.) 3 Output power of single module [W] 1200
Total output power [W] 1200-3600W (max./system) Grid connection Up to 3 phases (3 x 230V) Input voltage range [V] 100 - 260
Input current [A] max. 7A @ 230V (per module)
Power factor 0,99
Output current [A] 72A (24A per module)
Voltage
Output voltage 42 – 60V Charging voltage [V/cell] Adjustable Maintanance voltage [V/cell] Adjustable Battery function test [V/cell] Adjustable
Output voltage stability
Static stability [%] +/- 0,5
Dynamic stability [%] +/- 1,5
Efficiency [%] 91,00%
Charging characteristics IUoU
Ripple [mV] 40
Interference suppression Class B
Safety EN 60950
Protection class IP20
Operating temperature 0 to +50°C
Altitude Up to 2000 m above sea level Battery disconnector max. current [A] 80
Output circuits fusing max. 9 circuit breakers
System control module MC
Dimensions
Height [U] 3
Width [mm ] 483
Depth [mm ] 300
NSD-1800
DC power supply system 19”, 3U height, 3 power modules
with redundant power supply and TCP/IP remote monitoring
The NSD-1800 DC power supply system is suitable for a wide range of applications, especially in the field of telecommunications, where stable DC voltage in the range from 48 to 54V is required. With a wide input voltage range (100 – 256V AC) and high temperature tolerance of the surrounding environment, the NSD systems can be deployed indoor as well as outdoor. The system is equipped with internal as well as external communication and enables load sharing among individual modules. The supply modules are of the HOT-PLUG type for easy maintenance and system extension. Thanks to the redundant backup power supply in combination with natural, fan-less cooling, this system offers a very wide application range. Up to three systems can be connected in parallel.
NSD-1800
Power supply modules
The power supply modules are digitally controlled. Their functions include switching on and off, active load sharing and display of operation and error messages. Passive cooling reduces their maintenance requirements. The HOT-PLUG function enables quick and simple replacement of individual modules or their quick addition to the system under full operation.
Monitoring and alarms
The MC module (Master Controller) is equipped with 6 programmable, potential-free contacts in the standard version. The SNMP version is also equipped with a communication module with the TCP/IP protocol, which makes the entire system easy to control. Each individual module has a LED indicator of the module status and errors on the front panel. The MC module in the SNMP version additionally allows you to display the system status with other measured parameters on a PC (e.g. current, voltage, temperature).
External communication
You can set and control several of parameters via the Internet. Some of the adjustable parameters are input voltage, alarms, disconnection voltage or battery test.
Load sharing
The distribution panel is used for connecting the battery and an appliance. The battery is additionally connected via a disconnector. Moreover, the NSD systems are also equipped with a connector for a supplementary battery, which makes system maintenance considerably easier. The load can be connected via a circuit-breaker to up to four output circuits. The battery connection and output circuits are controlled by the MC module.
Mechanical design
The system is designed for installation in a 19“ rack. Its height is 3U and it is designed for a simple connection using cables. It is also fitted with connectors accessible from the top (battery and outputs) and from the rear (mains, temperature sensor, connections to other systems). The power supply modules and MC module can be accessed and fitted from the front side. Also, the network connector (RJ45) and connections of potential-free contacts (Cannon 25) are accessible from the front side.
Power supply system NSD–1800–XXX_XM
Number of modules per unit (max.) 3 Output power of single module [W] 600 Total output power [W] 1800 (max./system) Grid connection Up to 3 phases (3 x 230V) Input voltage range [V] 100 - 264 Input current [A] max. 6A @ 230V
Power factor 0,99
Output current [A] 30A (10A per module)
Voltage
Output voltage 48 – 54V Charging voltage [V/cell] 2,4 (72V) Maintanance voltage [V/cell] 2,23 (67V) Battery function test [V/cell] 1,8 (54V)
Output voltage stability
Static stability [%] +/-1
Dynamic stability [%] +/-5
Efficiency [%] 91,00%
Charging characteristics IUoU
Ripple [mV] 2
Interference suppression Class B
Safety EN 60950
Protection class IP20
Operating temperature -20 to +50°C Altitude Up to 2000 m above sea level Battery disconnector max. current [A] 40
Output circuits fusing max. 4 circuit breakers
System control module MC
Dimensions Height [U] 3 Width [mm ] 483 Depth [mm ] 300 Weight [kg ] 9,7kg Cooling passive Standards EN 60950 / UL 1950