2021/08/31
ID: 3833

Safety in fail-safe mode

Reliable preconfigured fail-safe circuit from Festo

The preconfigured fail-safe circuit in the ready-to-install control cabinet is a safe and low-cost alternative when it comes to fail-safe technology. It replaces a single-acting actuator and guarantees that the actuator assumes a predefined safety position in the event of a pressure and/or power failure.

The fail-safe circuit comes in three different versions, “Fail-Safe Standard“, “Fail-Safe Plus – Always Safe” and “Fail-Safe Plus – Manual Override” to suit different customer requirements. In all three fail-safe versions, the actuator assumes its predefined safety position if the compressed air and/or power supply fails. This is achieved by using compressed air from the reservoir to move the actuator.

 

This fail-safe circuit, configured by Festo in a ready-to-install control cabinet, is a low-cost and effective safety solution compared with a single-acting linear cylinder. The pre-assembled solutions simplify the engineering process. They are ideal for use in applications such as rainwater overflow tanks in water technology.

 

Fail-safe times three

If the power and/or compressed air fails, the actuator assumes its predefined safety position. This is the basic functionality provided by the “Fail-Safe Standard” version. With the “Fail-Safe Plus – Always Safe” version, the actuator moves into the predefined safety position unless the circuit is in manual operation. It is possible to switch between manual and automatic operation, but only when compressed air is available.

 

With the “Fail-Safe Plus – Manual Override” version, the “dominant” manual operation applies. If there is a compressed air and/or power failure, the actuator moves into the predefined safety position unless the circuit is in manual operation. It is possible to switch between manual and automatic operation. In manual operation, the actuator can be moved when there is no compressed air and power until the air reservoir is completely empty. The air reservoir must always be customised in accordance with the customer’s requirements.

费斯托 (Festo)是一家全球性的独立的家族企业,总部位于德国埃斯林根。自成立以来,Festo在工业自动化技术和技术教育方面制定标准,从而为环境、经济和社会的可持续发展做出贡献。公司为超过35个行业的30万家工厂和过程自动化客户提供气动和电驱动自动化技术解决方案,其中生命科学和实验室自动化业务受到越来越多的关注。Festo产品和服务遍布176个国家。2023年,费斯托在全球61个国家的250多个分支机构拥有约20600名员工,实现销售额36.5亿欧元。每年约7%的销售额用于研发。在这家学习型企业,1.5%的销售额用于基础和进一步培训。Festo 教学培训 (Didactic SE) 是全球领先的技术教育和培训供应商,为全球客户提供工业环境中全面的数字化和常规学习解决方案。

© Festo SE & Co. KG
Control cabinet with fail-safe circuit
Safe and low-cost: the preconfigured fail-safe circuit in the ready-to-install control cabinet.