Non-Contact Safety Switches CES - EUCHNER GmbH + Co. KG - #49

Text version of the page

49 Non-Contact Safety System CES-AZ Subject to technical modifications; no responsibility is accepted for the accuracy of this information. Read head CEM with guard locking without guard lock monitoring With or without remanence In particular during metal machining, the residual magnetism (remanence) in the solenoid can cause problems. In the open state, metal chips may be drawn to the contact area. The next time the guard is closed, there will be a gap between the actuator and read head that will limit the adhesive force. To avoid this effect there are read heads without remanence. These are de-magnetized when the safety guard is opened such that metal chips adhering to the surface fall off. Your advantages Safety switch with transponder coding Every actuator is unique Absolutely secure against tampering Integrated solenoid for process protection Unintentional opening of the safety door is prevented Safety switch and solenoid form a single compact unit High adhesive forces from the solenoids (500 N or 1000 N) Protection of the machining process Simple operating principle No wearing parts Robust housing for harsh environments Connection via M8 plug connector Low wiring effort Easy to replace if servicing is required Approved by BG and UL (Canada and USA) ƒô ƒô ƒô ƒô ƒô ƒô ƒô ƒô ƒô ƒô ƒô ƒô ƒô ƒô ƒô With transponder coding Integrated solenoid (without monitoring of the guard locking) Up to category 4 / PL e nach EN ISO 138491 for monitoring the safety guard Important: The device is only allowed to be used as guard locking if there is no hazard due to overtravelling machine movements. The guard locking is only used for process protection. ƒô ƒô ƒô Design and functionality A CES read head and a solenoid are integrated into the CEM read head. The CEM read head is connected to the CES evaluation unit with a round M8 plug connector. The CEM actuator of identical design also has a metal plate in addition to the transponder; this plate acts as an armature for the solenoid coil. When the safety door is closed, the CEM actuator enters the operating distance of the CEM read head. The transponder signals are transferred, and then the evaluation unit closes the safety contacts and sets the OUT output "high". By applying voltage to the solenoid for the CEM read head, strong magnetic forces can be generated between the coil (in the read head) and the armature (in the actuator). Depending on the design, adhesive forces of approx. 500 N or 1000 N respectively are applied between the CEM actuator and the CEM read head. Practical experience has shown that these magnetic adhesive forces effectively prevent any opening, even if the user applies considerable effort. Use of the read head even in extremely harsh environments The read heads CEM have an extremely robust design. The high degree of protection IP 67 and the metal housing allow the read head to be used in extremely harsh environments. The armature plate for the CEM actuator has spring mountings and can be tilted up to an angle of ± 4°. Therefore, when a maladjusted safety door is closed, the CEM actuator adjusts itself independently to the surface of the CEM read head. It is not necessary to readjust the safety door when using the read heads CEM. When mounting the read head CEM, it is only necessary to ensure that the CEM actuator is guided in front of the CEM read head when the door is closed, so that the strong adhesive forces can be generated. Because the read head has only a small number of moving parts which can wear, the mechanical life of the CEM read heads is virtually unlimited. Different versions EUCHNER provides two CEM housing designs. The two versions differ in their dimensions, according to the size of the solenoid. The safety switch CEM with an adhesive force of 1000 N is used with large, heavy safety doors. This read head has an additional M8 plug connector for connecting an external LED display. When voltage is applied to the coil, it is indicated to the user that the safety door is in the locking position. An LED display in the immediate vicinity of the door handle is extremely advantageous, especially in the case of large, solid doors. The smaller version of the read head CEM has an adhesive force of approx. 500 N. It is suitable for securing smaller safety doors and safety flaps. An LED indicator in the M8 male socket on the CEM-A-LE05K-S2 read head indicates to the user when voltage is applied to the solenoid.