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The isense CF.Q module is used for the early detection of the change in electrical specifications of chainflex® cables due to the mechanical loads during operation in an igus® e-chain system®. For this purpose, the electrical resistance of a dedicated conductor loop is measured during operation. Temperature-related resistance changes are compensated for by means of PT100 measurement at the installation location of the cable. Microprocessor-based, continuous data evaluation is carried out by own algorithms of igus®. These form arithmetic as well as sliding average values of the measured resistance values approx. 50 times per second and evaluate them in a temporal context.
If the system detects a permanent change in the electrical specifications, it recommends replacing the cable as soon as possible by switching a potential-free contact. If the cable is not replaced, the system switches off the system as a precaution in the event of a complete core rupture.
For later investigations, the system logs all measured values that led to the warning and shutdown.
In this option, space is still needed to route an additional cable in the e-chain® because the CF.Q is routed as a "sacrificial cable" in the e-chain®.
All cores of the cable are "connected in series" and connected to the measuring input of the module.
Advantage: All cores are measured, which means that there is no need to select the most frequently used cores.
Disadvantage: Regardless of the production batch and the assembly method, even cables from the same production batch can achieve different service life durations.
In a monitored cable, two unused cores are defined as measuring cores and, if necessary, routed to the measuring connections of the CF.QA module by means of a shielded extension cable.
This often requires a modification of the connector assembly, as the two cores must be led out of the connector on the distributor side at the cable entry.
Advantage: The cable actually used by the customer is monitored
Disadvantage: The original cable often has to be replaced by a variant with two additional cores, which usually increases the cable diameter, and the apparently "weakest" cores should be chosen.
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