ABB YXU149 YT296000-RX Control Board
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. Inthe PLC system an error message is then stored (FK4, error number 4). 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.
YXU149 YT296000-RX
ABB YXU149 YT296000-RX
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 value of the range underflow is stored. If the ope circuit monitoring is configured, the open-circuit event is displayed by the red LED Ovl as long as it is present. In the PLC system an error message is stored (FK4, error number 9). The following figure shows the connection of 2-pole passive- type analog sensors 4...20 mA. If the analog current sensors 4...20 mA are powered from a separate power supply unit, the reference potentials 0V (of the separate power supply unit and the power supply unit for the 07 KT 94) must be interconnected to each other.In the above example, the AGND terminal remains unused.
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ABB YXU149 YT296000-RX
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