The Cutler-Hammer AKT is designed to provide electrical isolation between the input and output signals of an analog system.
Application Description
Use of the ATK is recommended where operational reliability is critical and signal distortion must be kept to a minimum. Signal distortion can be caused by conditions such as long lead wires or use of multiple power supplies. In addition, atmospheric interference may also cause brief differences in voltage on a shared potential system — this can cause damage to the devices involved in the transmission. Electrical isolation provides a certain degree of safeguard against these conditions.
The Cutler-Hammer C383CSR Current Sensing Relay is a DIN rail mountable changeover relay activated by signal level currents. It is suitable for initiating switching functions for signals within the range of 4 to 20 mA. The electronic module contained within the relay is electrically capable of operating over a range of 9.5V DC to 40V DC. This module is unique in that it has a built-in processor which allows it to detect current levels between 4 mA DC and 20 mA DC. The current level that triggers the relay can be user adjusted throughout that range by means of a potentiometer on the face of the unit. The C383CSR relay contains both the control electronics and the dry contact relay in a single package, lowering systems costs and reducing rail space requirements.
ADW modules are used for converting signals in analog form to signals in digital form.
Application Description
Corresponding to the different standard signals at the input, there are various versions of devices. For higher resolution, the 12 bit converter is equipped with a differential input to be able to eliminate interference at the feed-in earthing by means of a separate signal earth-line (floating earth). This signal earth can of course be connected directly to the feed-in earth.
Digital analog converters "reconstruct" a proportional analog signal from a digital measuring or a set value. They therefore constitute the reverse of the ADW function. While the ADW typically belongs to the input side of the PLC or of the computer, the DAWs serve to generate control signals for subsequently connected analog control devices preferentially on the output side. Using the Cutler-Hammer DAWs, it is possible both to control processes in a high dynamic manner as well as to retain constant values in the memory for as long as desired.
Measuring a Mechanical Machine Position
Mechanically coupled potentiometers are often used to measure angles of rotation and thrust motions for installation of machine parts. These potentiometers can give analog displays of wave positions as well as linear motions via tackle or toothed racks.
The high-potentiometers can be advantageously fed using our constant voltage source KSQ 10V which, thanks to its adjustability of +0.5V, is able to compensate for potentiometer inaccuracies and full scale deflections. The low capacity potentiometer tap can then be given a greater capacity by subsequently switching a coupling module and the 0 – 10V signal can be converted into another signal standard — using the AKT, also potential-free. It is also possible to digitalize directly into 8 or 12 bits by using a Cutler-Hammer ADW. A special version of the module is also available with an additional constant current output. This makes it possible to tap voltages at variable resistors and much more.
