It also checked conducted a check on all other cranes on site and ordered a check of all of its cranes for similar scaffold/formwork or other attachments to the tower structures and implements a new rule that no structural alterations or attachments can be made by clients to its cranes without its prior consideration and approval. The company has sent the bolt to a laboratory for further analysis, but in the meantime it removed and checked all tower bolts and replaced and re-tensioned them and a new dynamic load test was conducted. Suggesting that vibrations and changed dynamics from the attachments may have played a role in the bolt's failure. On further investigation it was revealed that scaffold and formwork had been attached to and braced against the tower, close to the failed bolt. PSENcode offers maximum manipulation protection up to PL e of EN ISO 13849-1 / SIL CL 3 of EN/IEC 62061.D&G cranes of Australia has issued a safety alert relating to a tower bolt failure on a Comedil CTT 561-A24 crane, working on a site in Canberra.Įarlier this month a new tower bolt suffered a catastrophic failure, the crane was working at the time and the initial report suggested that the failure was caused by fatigue, even though it was new. Magnetic safety switch PSENmag 1.4: PSENmag offers a cost-effective solution where requirements for protection against manipulation and defeat are less stringent.Ĭoded safety switch PSENcode: Guarantees maximum manipulation protection within the smallest space requirement by transferring a unique code from the actuator to the switch (key lock principle).Ĭombination of mechanical safety gate system PSENmech with guard locking (PSEN me5) and coded safety switch PSENcode: PSENmech stops unintentional opening thanks to process guarding. Mechanical safety switch PSENmech (PSEN me1): The increased extraction force of the PSENmech stops the safety gate being opened unintentionally thanks to process guarding. Various safety gate applications can be safeguarded using the safety bolt PSENbolt, depending on the action principle of the applied safety switch:

The safety bolt is also ideal for areas in which safety gates are often opened and closed again. The safety bolt PSENbolt is ideally suited to safety gates that are difficult to adjust, as well as safety gates that are exposed to strong vibration.

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