Technical data • Complete system
Chapter 2
Technical data
Power Panel 500 user's manual V1.40
29
2.5.2 +24 VDC power supply
The 3-pin male connector required for the power supply interface is not included in delivery. It can be ordered from
B&R using model number 0TB103.9 (screw clamps) or 0TB103.91 (cage clamps).
The pinout is listed in the following table and printed on the housing. The supply voltage is protected internally by
a soldered fuse (10 A, fast-acting) to prevent damage to the device in the event of an overload (fuse replacement
necessary) or if the voltage supply is connected incorrectly (reverse polarity protection - fuse replacement not
necessary). The device must be returned to B&R for repairs if the fuse is blown in the event of an error.
Power supply
Protected against reverse polarity
Pin
Description
1
+
2
Functional ground
3
-
Model number
Short description
Terminal blocks
0TB103.9
Male connector 24 V 5.08 3-pin screw clamps
0TB103.91
Male connector 24 V 5.08 3-pin cage clamps
3-pin male connector
1
2
3
Table 7: 24 VDC power supply interface
2.5.2.1 Grounding
Caution!
Functional ground (pin 2 of power supply and ground connection) must be kept as short as possible
and connected to the largest possible wire cross section at the central grounding point (e.g. the control
cabinet or system).
The ground connection is located on the back of the system unit.
Ground
connection
Figure 9: Ground connection
The M4 self-locking nut must be used, for example, to fasten a copper strip to a central grounding point in the
control cabinet or system where the device is installed. The largest possible conductor cross section should be
used (at least 2.5 mm²).
