Installing system components
3.6 Connecting the connection box
Mobile Panels 2nd Generation
64
Operating Instructions, 09/2018, A5E33876626-AC
3.6.4
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 specified 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
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.
NOTICE
External protective circuit
An external protective circuit is required for operation with 24 V DC; please refer to
section 7 "Lightning protection and overvoltage protection" in the following function manual:
"Designing interference-free SIMATIC S7-1500, ET 200MP, ET 200SP, ET 200AL
controllers (
https://support.industry.siemens.com/cs/ww/en/view/59193566
)".
Requirement
●
The power supply meets the requirements set out in
"Technical specifications (Page 233)".
●
The connection box standard or advanced is open.
●
Read the information on power supply cables and equipotential bonding cable in the
section "Specification of cables to be used (Page 242)".
●
The wires of the power supply cable have been stripped by 8 mm.
●
Matching ferrules when using flexible cables