ABB TU843 PLC Module 16 I/O Channels

ABB TU843 PLC Module 16 I/O Channels

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Based on the total power dissipation, the maximum permissible collector current rating of a module can be calculated with equation. Thus, in order to give a current rating of a module, the corresponding junction and case temperature has to be specified, as shown for example in Figure 6. Please note that current ratings without defined temperature conditions have no technical meaning at all. 

The nominal current rating can be exceeded in an application for a short time. This is defined as repetitive peak collector current in the datasheet as can be seen in Figure 7 for the specified pulse duration. 

In theory, this value can be derived from the feasible power dissipation and the transient thermal impedance Zth, if the duration of the over current condition is defined. However, this theoretical value is not taking any limitations of bond wires, bus-bars or power connectors into account.

ABB TU843 Technical drawing:

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