ABB Module DSSR122 48990001-NK ABB DSSR122 48990001-NK DSSR 122 Power Supply FACTORY SEALED

Product Description:

When resistance thermometers are used, a constant current must flow through the measuring resistor in order to create the necessary voltage drop for the evaluation. For this purpose, the basic unit 07 KT 94 provides a constant current sink, which is multiplexed to the 8 analog channels.The following figure shows the connection of Pt100 resistance thermometers in 2-wire configuration..Important:The common mode input voltage range equals the measuring range of the single channel. I.e. that the signals, related to AGND, at the two involved inputs must not exceed this measuring range.Input voltages 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.

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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: