ABB Module DSQC697 3HAC037084-001 ABB DSQC697 3HAC037084-001 DSQC 697 Computer unit New Sealed

ABB Module DSQC697 3HAC037084-001 ABB DSQC697 3HAC037084-001 DSQC 697 Computer unit New Sealed

Product Description:

The following figure shows the connection of a 3-wire sensor powered by 24 V DC and of a 2-pole sensor powered electrically isolated. Both sensors work as active current sources 0...20 mA.It has to be taken into consideration, that in this application the M terminal of the basic unit 07 KT 94 is the reference potential. AGND1 is not dimensioned for carrying the sum of the sensor currents.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

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Product's Character:

Input currents that exceed the measuring range cause the overflow numerical value of +32767. If the measured value is below the range, the underflow numerical value of -32767 is set.The input impedance is ca. 330 Ω. The current input has a self-protecting mechanism. If the input current gets too
high, the shunt is switched off and the value for range overflow is generated. About every second, the unit tries to switch on the shunt again. In this way the correct measurement will succeed after the current has reached a normal value again.The trigger of the self-protecting mechanism is displayed
by the red LED Ovl as long as the overload is present. In the PLC system an error message is then stored (FK4,error number 4).The open-circuit monitoring begins below ca. 3 mA.

The use of the product: