ABB Module 07CR41 ABB 07CR-41 POWER SUPPLY NEW in sealed box

ABB Module 07CR41 ABB 07CR-41 POWER SUPPLY NEW in sealed box

Product Description:

In order to avoid measurement errors, it is absolutely necessary, to lead the cores to the Pt100 sensors in the same cable. The cores must have the same cross section. Per channel, a twisted pair is used (for the two terminals of the Pt100 sensors) plus a single core (half of a twisted pair) for the connection to AGND1. Depending on the configured operating mode, the measured value is assigned linearly as follows the return wire AGND1. In the operating mode "Pt100 in 3-wire configuration" two adjacent analog inputs belong together (e.g. EW 6,00 and EW 6,01). For configuration, both inputs must be configured to the desired operating mode, see configuration table Fig. The constant current of the one channel flows through the Pt100 resistance sensor, the constant current of the other channel through one of the wires.
The basic unit 07 KT 94 calculates the measuring value from the two voltage drops and stores it under the odd address

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Product's Character:

Differential inputs are very useful, if analog sensors are used which are remotely non-isolated (e.g. the minus terminal is remotely earthed). Since the earthing potential is not exactly the same as
AGND1, it has to be measured bipolar in order to compensate measuring errors. Additionally, in case of singlepole configuration, AGND1 would be connected directly to the remote earth potential. This would cause inadmissable (and possibly dangerous) earthing loops. In all configurations using differential inputs two adjacent analog inputs belong together (e.g. EW 6,00 and EW 6,01). For configuration, both inputs must be configured for the desired operating mode, see configuration table Fig. The measured value is calculated by subtraction. The value of the channel with the lower address is subtracted

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