Application A lightweight safety door covering an industrial washing machine must be safeguarded.
1. Risk Analysis The risk posed by this protective door must first be analyzed. In this case, the safety edge is merely required to protect the operator from the door as it closes automatically. Safe limit switches are used to determine whether the door is closed and the machine can start operation. Due to the weight of the door and torque of the drive motor, only minor injuries can be sustained and category 1 to DIN EN 954-1 will consequently suffice.
2. Profile The user must now select a suitable profile. The over travel of the profile is the most important criteria. The over travel specified by the manufacturer must be greater than the stopping path of the door. The profile OSE-P 25 30 00 is the most suitable for this application, as it features sufficient over travel and the appropriate geometry. The aluminum rail ALU-2509 is used as a mounting rail.
3. Sensors and Control Unit The choice of control unit depends on the risk analysis. Since category 1 is required, the control unit OSE-C 4524 can be used here. The profile has an 11 mm chamber; sensor types OSE-R 1100 and OSE-T 1100 must therefore be used.
4. Accessories The sensors are connected in the junction box (AC 1101) on the door and connected via a three-wire lead to the control unit installed in a control cabinet approx. 20 m away.
5. Connection to the Control System The Stop signal of the safety edge is looped into the safety circuit of the machine control and stops the door if actuated. Optionally the Monitoring signal is connected to the machine control.
6. Adjustment of the Limit Switches The limit switches must be readjusted as a result of using the safety edge. The sensing chamber should not be crushed in the limit position.
