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M7350-RSHC-for Shut-Height Control
AVG Autotech's M7350-RSHC resolver-based shut-height control module is a convenient way to provide Press Shut-Height Control functionality to your Modicon PLCs. A module takes up only one slot in the PLC and communicates with the PLC via several I/O registers. The position-input signals come from a multiturn resolver (such as an AVG Autotech RL210 or E8R) mounted on the adjusting screw of the ram.
With the M7350-RSHC, the press setup man no longer needs to carry around a list of the shut-heights for each die. Once the shut-height has been estab-lished for a particular die set, the M7350-RSHC module retains this value and associates it with the die name (up to 8 alphanumeric characters long) and/or number of the die set.
Variables for 500 single-action or dual-action dies can be preprogrammed and stored for later use. During a die changeover, the Remote Enable (RE) Input allows the operator to select any one of 32 setups (Quantum-only). The PLC can access all 500 setups via the backplane. After the operator enters
either a particular die number or die name, the automatic die positioning sequence can be initialized either by the PLC or (Quantum only) the operator (by activating the Remote Start input). The M7350-RSHC senses the die position and adjusts the shut-height to the preprogrammed position.
To maintain high-quality partproduction, it's necessary that the die does not drift too far from the shut-height value. The value of "drift" that can be allowed is also entered as a part of the die identification data.
During die changeover, the operator need only enter a particular die number or die name. When the automatic die positioning sequence is activated, either by an external input or via the PLC backplane, the M7350-RSHC senses the die position and adjusts the shut-height to the preprogrammed position.
During production, the M7350-RSHC monitors the amount of drift that occurs. If the preset value is exceeded, the press is stopped. It also monitors the preset safety limits, shutting down the press if either the upper or lower safety limit is exceeded.
Simple to Calibrate
Calibration is quite simple and does not require any computations by the user or PLC. All the user has to do is move the ram to the first and second calibration positions and enter the corresponding values for those positions. The unit computes scaling of the parameters automatically. (Calibration points must be between safety limits.)
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