48 Vdc Power Supply - ASCOM Ascotel 2025 System Manual

ascom Ascotel 2025/2045/2065
4.2

48 VDC Power Supply

To operate the system with 48 VDC, the DC-48V module has to be fitted. This
module is connected in the same way as the UPS-12V module (see Fig. 4.13). The
battery switching circuit is secured on the module with a 5 A special fuse (Wick-
mann FUN 125 A). If the polarity is the wrong way around, the fuse breaks the
circuit and must then be replaced. Unlike the UPS-12 V module, here a battery
cable with a cross section of 2.5 mm
Fitting and Connecting the DC-48V Module
Hazard:
Once the mains is connected or the DC-48V module is connected to the
DC power supply, there are hazardous voltages inside the PBX housing.
Make sure the cover in the power supply area is securely closed before
connecting the power supply.
1. Disconnect the PBX from the power supply.
2. Remove the cover of the power supply area.
3. Mount the angle bracket with the provided screws.
4. Fit the battery cable without connected battery to the DC-48V module. Make
sure the polarity is correct!
5. Connect the DC-48V module to the PBX. To do that connect the cable to the
primary connector and secondary connector (see Fig. 4.12).
6. Use the provided screws to fasten the DC-48V module to the angle bracket.
7. Secure the cover to the power supply area.
8. Connect the battery. Make sure the polarity is correct!
If a 48 VDC isolating point is provided, it must be equipped to handle current of
5 A (at 48 VDC).
The PBX with the installed DC-48V module can also be operated on the 230 VAC
power supply.
4.16 PBX Power Supply
2
is sufficient.
HBT_20321104_04/B0_en