Technical data
Automation PC 3100 User's manual V 1.00
Translation of the original documentation
37
2.2.6.2 +24 VDC power supply
Danger!
The device is only permitted to be supplied with a SELV/PELV power supply or with safety extra-low
voltage (SELV) per EN 60950.
The 3-pin connector required for connecting the power supply is not included in delivery. This can be ordered from
B&R using model number 0TB103.9 (screw clamp terminal block) or 0TB103.91 (cage clamp terminal block).
The pinout is shown in the following table. The supply voltage is protected internally by a soldered fuse (15 A, fast-
acting) so that the device is not damaged if the supply voltage is overloaded (fuse must be replaced) or connected
incorrectly (reverse polarity protection, fuse replacement not necessary). If the fuse is destroyed during a fault
event, the device must be sent to B&R for repairs.
+24 VDC power supply
Reverse polarity protection
Pin
Description
1
+
2
Functional ground
3
-
Model number
Short description
Terminal blocks
0TB103.9
Connector, 24 V, 5.08 3-pin screw clamp terminal block
0TB103.91
Connector, 24 V, 5.08 3-pin cage clamp terminal block
Connector, 3-pin, male
1
2
3
+24 VDC power supply
Table 22: +24 VDC power supply connection
Electrical properties
Nominal voltage
24 VDC ±25%, SELV
1)
Nominal current
Max. 5.5 A
Overvoltage category per EN 61131-2
II
Inrush current
Max. 60 A for <300 µs
Galvanic isolation
Yes
Uninterruptible power supply
No
1)
EN 60950 requirements must be observed.
2.2.6.2.1 Grounding
Caution!
The functional ground (power supply pin 2 and ground connection) must be connected to the central
grounding point (e.g. the control cabinet or system) via the shortest possible path with the lowest pos-
sible resistance and with the largest possible wire cross section. This type of grounding is mandatory
for proper functionality.
Automation PC systems have a ground connection on the interface cover.
Grounding
For example, a copper strip must be attached to the ground connection at a central grounding point of the control
cabinet or system in which the device is installed. The wire cross section should be as large as possible (at least
2.5 mm²).
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