ABB Module DSQC236T YB560103-CE ABB DSQC236T Servo Drive Axis Circuit Board long life
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.The following figure shows the connection of 2-pole passive type analog sensors 4...20 mA.32760D 7FF8H Further details can be found in volume 2, chapter 5.1 "General information for the use of analog inputs and outputs". In order to make sure, that unused input channels have a defined 0V level, they may be shorted to AGND. Unused inputs must be configured with "unused". The relationship between the analog input signals and the converted numbers is illustrated in the following figures.
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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).
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