Mains Connection; Output Connection - Bosch PRAESENSA Installation Manual

170 en | Power supply module | PRA-PSM24, PRA-PSM48
16.5.3

Mains connection

The terminal block connector allows for easy and fast wiring.
For connecting the mains power to the power supply, follow the procedure below:
1.
2.
3.
4.
5.
The unit is protected with an internal fuse (not replaceable) at the L input and the power
supply has been tested and approved on 20 A (UL) and 16 A (IEC) branch circuits without an
additional protection device. An external protection device is only required if the supplying
branch has a current capability greater than this. Thus, if an external protective device is
necessary or utilized, a circuit breaker must be used with a minimum value of 4 A (B-
characteristic) or 2 A (C‑characteristic).
Caution!
The internal fuse must not be replaced by the user. In case of an internal defect, return the
!
unit for inspection.
16.5.4

Output connection

Use the positive (+) and negative (-) screw connections to establish the 24 V (PRA-PSM24) or
48 V (PRA-PSM48) connection. The output voltage can be adjusted upwards to 28 V or 56 V
with the front side potentiometer, but for use with PRAESENSA keep the power supply at 24 V
or 48 V. The green LED DC OK displays the correct functioning of the output. The device has a
short circuit and overload protection and an overvoltage protection.
For connecting the output to a PRAESENSA device, proceed as follows:
1.
2.
3.
4.
5.
6.
7.
In the event of a short circuit or overload, the output voltage and current collapses when the
overload current exceeds 150% of the maximum output current. The output voltage is then
reduced and the power supply enters the hick‑up mode until the short circuit or overload has
been removed.
2019.11 | V1.00 |
Use standard flexible (stranded wire) or solid cables with a cross section of 0.75 to
2.5 mm² (AWG 18 to 14), designed to sustain an operating temperature of 75°C (167°F).
For secure and reliable connections, the stripping length should be 7 mm.
For safety, ensure that all wires are fully inserted into the connecting terminals. In
accordance to EN 60950 / UL 60950, flexible cables require ferrules.
Fix the L (Live), N (Neutral) and PE (Protective Earth) connection wires to the input
terminal connector to establish the 100 to 240 VAC connection, using a torque of 0.5 Nm.
Plug the connector into the power supply.
Use a PRA-PSM24 to power a PRA-SCx system controller or auxiliary device designed for
24 V operation.
Use a PRA-PSM48 to power a PRA‑AD60x multi-channel amplifier or PRA-ES8P2S Ethernet
switch, designed for 48 V operation.
Use standard flexible (stranded wire) or solid cables with a cross section of 1.5 to
2.5 mm² (AWG 16 to 14), designed to sustain an operating temperature of 75°C (167°F).
For secure and reliable connections, the stripping length should be 7 mm.
For safety, ensure that all wires are fully inserted into the connecting terminals. In
accordance to EN 60950 / UL 60950, flexible cables require ferrules.
Use a torque of 0.5 Nm on the screws to secure the wire connections.
For cable redundancy use two cables in parallel (2x2 wires) between the dual output
connections of the power supply and the A and B inputs of the loads to be connected.
Installation manual
PRAESENSA
Bosch Security Systems B.V.