6 Connection
SMA Solar Technology AG
Installation Manual
27
EDMM-WAGO-IO-IA-en-11
6.5
Voltage supply terminal
6.5.1
Overcurrent protection
WARNING
Risk of fire due to insufficient overcurrent protection
In the event of an error, insufficient overcurrent protection may present a fire risk. If the current flow is too high in the
components, in the event of an error this could result in excessive overheating.
• Always design the overcurrent protection based on the anticipated power usage.
The fieldbus coupler and supply module are responsible for feeding-in the system and field voltage supply of the
WAGO-I/O-SYSTEM 750. For components that work with low voltages, only SELV/PELV voltage sources can be used.
To supply multiple components from a single voltage source, this voltage source must be designed in accordance with
the strictest electrical safety requirements based on these components. For components that may only be supplied with
voltage from SELV voltage sources, these requirements are listed in the technical data. Most of the components in the
WAGO-I/O-SYSTEM 750 do not have any internal overcurrent protection. For this reason, a suitable overcurrent
protection must be installed externally for every feed-in, for example using fuses. The maximum permitted current is
listed in the technical data of the installed components.
6.5.2
Potential isolation
There are three galvanically isolated potential groups in the WAGO-I/O-SYSTEM 750:
• Galvanically isolated fieldbus interface
• Electronics of the fieldbus coupler and the I/O modules (local bus)
• All I/O modules are equipped with galvanic isolation between the system electronics (local bus, logic) and the
field-side electronics. This isolation is installed per channel for some digital input modules and analog input
modules. For further information, see the product specifications of the individual I/O modules.
6.5.3
System supply
NOTICE
Damage to the electronics
Without overvoltage protection, the electronics can be damaged.
• Ensure that the power supply is adequately protected. If you use a fuse for overcurrent protection of the system
supply, use a fuse with a maximum of 2 A for this purpose.
NOTICE
Damage due to exceeding the maximum current at the power contacts.
• Please ensure that the maximum current that can run through the power contacts does not exceed 10 A.
Summary of Contents for Modbus EDMM-10
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