features
- Standard 19” Half Rack Lightweight Plug in Module
- Switch Mode Conversion at >60KHz
- N+1 Redundancy
- High Efficiency
- CVCC Type
- ‘Hot’ Replacement of Modules
High Power 1200W to 7200W DC/DC Converter System
Telecom Systems are normally designed to work from exchange Battery. Several modern equipment, however are designed to work off 24V DC supply. High Efficiency DC/DC Conversion from 48 Volts to 24V DC is therefore necessary.
The APLAB High Efficiency, High Power DC/DC Converters are in wide demand to convert 48V station battery Voltage to 24V DC. Basic module is rated at 50Amps and has a built-in automatic current sharing feature to connect several units in parallel for higher current capacity upto 250 Amps. Different models need to be selected from the available range.
The system has modular design to meet DC load requirements from 50 Amps to 300 Amps in multiples of 50 Amps.
Analog meters are optionally provided for Display Output voltage and load current of each module. Status LED are provided for Output Over Voltage & Over Temperature.
| Technical Specifications | |
|---|---|
| INPUT | |
| Voltage | 43.2V – 57.6V DC. |
| Current No Load | 1A typical at 48V. |
| Recovery Time | 1ms typical. |
| Current Maximum Load. | 30A typical at 48V. |
| Protections | Input under voltage, over voltage turns off the unit, builds up automatically if recovered from abnormal condition.. |
| INPUT | |
| Voltage | 24V DC (23V-28V settable by front panel potentiometer) 50 Amps max. |
| Output Characteristic | CV, CC.. |
| Load Regulation | ±1% +Diode drop.. |
| Line Regulation | ±1%.. |
| Ripplet | 200mV p-p.. |
| Efficiency | Better than 82%.. |
| Recovery Time | 1ms typical. |
| Over Voltage Protection OVP | Electronic turn-off-reset through On/Off/Reset switch. Adjustable on front panel 24-33 (fixed 30V).. |
| Redundant Operation | Possible through built in D-diode.. |
| Over Temp. Protection OTP | Electronic turn off-reset through front panel On/Off/ Reset switch.. |
| Parallel Operation | Possible, unlimited. |
| Operation in Series Description of Signalling | Possible with option U (cross diode).. |
| Indicators and Controls | a) LED Green = Normal operation. b) LED Red = Over voltage. c) LED Red = Over temperature. d) On / Off / Reset switch = On & Off as well as Over Temp., over voltage reset. e) Potentiometer = Output voltage adjustment. f) Potentiometer = Over voltage protection adjustment. g) Analog meters for output voltage and current measurement (optional).. |
| Alarms | Output falls below 85% of nominal voltage alarm by potential-free change-over contact-loadable with 220V/1A/40W.. |
| GENERAL DATA | |
| Derating | 2.5% / °C above +40°C.. |
| Storage Temperature | -20°C to +70°C… |
| Humidity | 90% without condensation.. |
| Cooling | By temperature controlled DC fan suction through front panel exhaust on the back. |
| Switching Frequency | >60KHz.. |
| Electrical Compliance | VDE 0160/VDE 0804/VDE 0805 protection class 1.. |
| Isolation | Input/Output to Earth – 1400V DC.. |
| Mechanical Construction | 19” sub unit = 4 unit high, 405 mm deep.. |
| Connectors | Brass terminals for Input/Output connection. 6 way terminal for sense, current share bus and alarm contact.. |
| Weight | Approx. 7 Kg. |
| Input Over Voltaget | The unit trips and automatically recovers under healthy input condition.. |
| Input Under Voltage | The unit trips and automatically recovers under healthy input condition.. |
| Input Reverse Polarity | Diode fuse combination.. |
| Inrush Current | NTC provided in series path of input.. |
| Output Short Circuit | Hiccup type characteristics.. |
| Overload | CC type.. |
| Output Over Voltage | Unit trips/can be reset manually thru’ reset switch provided on the front panel.. |
| Ability to Hot swap of Power Module | |
| Selection Guide | |||||
|---|---|---|---|---|---|
|
Model
|
Input ‘V’
|
Output ‘V’
|
Load Current
|
Dimensions (mm)
W x D x H |
Dimensions (mm)
W x D x H’ |
|
DDC 48/24/50
|
48V DC
|
24V DC
|
50 A.
|
460 x 500 x 310.
|
1+1
|
|
DDC 48/24/50
|
48V DC
|
24V DC
|
100 A
|
460 x 500 x 620.
|
2+1.
|
|
DDC 48/24/150
|
48V DC
|
24V DC
|
150 A.
|
460 x 500 x 620.
|
3+1.
|
|
DDC 48/24/200
|
48V DC
|
24V DC
|
200 A
|
460 x 500 x 800.
|
4+1.
|
DDC 48/24/250
|
48V DC
|
24V DC
|
250 A
|
460 x 500 x 800.
|
5+1
|