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Function Description
WAGO-I/O-SYSTEM 750
750-1425 8DI PTC
Manual
Version 1.1.0
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Function Description
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PTC thermistors for motor protection maintain their function due to the strong
non-linear variation of the resistance value at a certain response temperature
(ϑnat).
The temperature sensors are integrated in the winding to be protected.
Properties, structure and characteristics of these components are standardized
according to DIN 44081 or DIN 44082.
The I/O module 750-1425 (8DI PTC) evaluates the abrupt change in resistance of
the PTC when the ϑnat is exceeded and reports this status to the higher
-level
controller.
Up to 6 PTCs can be switched in series per channel.
Figure 7: Example of resistance curves for 1, 3 and 6 PTCs
