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A new web tension measuring amplifier and an actuating drive from Erhardt+Leimer

News 03.02.2017
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Web tension displayed separately for left and right side

The PA 62 is a two-channel measuring amplifier for connecting any load cells; it displays not only the sum signal but also the web tension on the left and right hand side of the web separately. The device can do without any fixed buttons; buttons for operation are displayed on the LCD display only when required. Besides the actual web tension it indicates a trend curve and alerts the operator if limits are exceeded. The inputs and outputs can be configured individually. The device also offers an Ethernet interface for process integration.

Highly dynamic and maintenance-free

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The AG 9 is the first actuating drive developed entirely by E+L. The device was primarily designed for web guiding systems, however in principle it can be used in all applications that require a maintenance-free, highly dynamic linear drive with a large actuating force. 

In combination with the command station DO 3001, the AG 9 is used for web guiding on unwinders, winders and in large pivoting frames. Ethernet networking with response times of 1 ms and an actuating speed of up to 60 mm/s ensure maximum actuating dynamics. Even at high reel weight, that allows optimal compensation of tumbling errors, for example. Control frequencies up to 4 Hz are possible.

The AG 9 is the only fully integrated actuating drive on the market with a brushless and therefore wear-free motor. The position is acquired via an integrated absolute encoder – this is also a unique feature. That means that no reference run is required on commissioning, and the current position of the actuating drive is not lost even if the power fails. The controller is also integrated in the actuating drive.

As the AG 9 is a direct drive without gearbox, it is almost play-free in the axial direction. The device itself is highly compact, allowing it to be mounted even in tight spaces.

The actuating drive is available in two variants: the AG 91 offers an actuating force of 1000 N at an actuating speed of 60 mm/s, the AG 93 provides 3000 N at 30 mm/s.


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