4.4.5.4 Connecting the functional grounding and power supply to the connection box
The power supply for the HMI device is connected to a terminal strip in the connection box. The
connection box has reverse polarity protection.
WARNING
24 V DC power supply
If the supply voltage is outside the specied range, it may cause the HMI device to malfunction.
This can result in personal injury or material damage.
Use a 24 V DC power supply with the following properties for the connection box:
• Safe electrical isolation according to IEC 60364-4-41 or HD 384.04.41 (VDE 0100, Part 410).
• The power supply provides safety extra-low voltage according to SELV/PELV up to a
maximum of 36 V DC and also does not exceed U
m
= 36 V DC in case of fault. Refer to the
information in the data sheet for overvoltage protection in the event of an internal error or
take appropriate voltage-limiting measures, such as the use of a surge protection device.
Requirement
• The power supply meets the requirements set out in "Power supply (Page 29)".
• The connection box standard or advanced is open.
• Power supply cables and equipotential bonding conductor
• The wires of the power supply cable have been stripped by 8 mm.
• Matching ferrules when using exible cables
Procedure
1. For connection box standard and connection box advanced: Thread the cables through the
corresponding screw glands.
2. When you use exible cables, place a wire end ferrule on each wire to be connected.
Connecting
4.4 SIMATIC connection box
Handheld Terminal HT 10
Equipment Manual, 09/2020, A5E47430965B AA 47
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