Ascotel IntelliGate 2025/2045/2065
728 PBX power supply Part 4
4.1.1.2 External UPS
The uninterruptible power supply is selected in accordance with the power
requirements of the PBX (see Tab. 4.3).
If a 12V device is used, the required battery capacity (Ah) can be also taken from
Tab. 4.3. In the case of terminals with a 24 V or 48 V battery, the battery capacity
values indicated in are to be divided by 2 and 4 respectively.
Uninterrupted operation of the PBX is ensured if the UPS takes control of the
power supply within the times indicated in Tab. 4.4:
Tab. 4.4: UPS: Maximum admissible making capacity for the UPS
See also:
For more technical details on the PBX see "Technical Data", page 974.
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. 4.18). The
DC input is secured on the module with a 5 A special fuse (Wickmann FUN125
5A). If the polarity is the wrong way around, the fuse breaks the circuit and must
then be replaced. Unlike the
UPS-12V module, here a power supply cable with a cross section of 2.5 mm
2
is
sufficient.
Fitting and connecting the DC-48V module
Hazard:
Once the 230 V 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 supplies.
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.
Mains voltage 230 VAC Max. making capacity of the UPS
Interruption < 30 ms
Drop to < 80% < 30 ms
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