PHOENIX CONTACT | Customer magazine UPDATE 3/2012

In the new PSR-Motionstop downtime and speed monitor, hazardous movements in machines and systems are monitored and deactivated in an instant in the event of an error. New options arise without compromising safety, particularly during machine setup or troubleshooting operations. Until recently, it was standard practice to shut down a drive by opening the safety equipment via a network or motor contactor, whereas various alternatives are available to designers today.This enables the use of a hand-held operator panel, movements in enabling/inching mode, and movements with reduced speed, for example. If the drive is not shut down, hazardous movements must be monitored by means of suitable safety components. Safe movement For the purpose of detecting movement, standard encoders, safe (approved) SIL encoders, and proximity switches can be connected to the new, safe PSR-Motionstop speed monitor.The safety functions STO (safe torque off), SLS (safe limited speed), SMS (safe speed monitoring), and SDI (safe direction) defined in the EN 61800-5-2 drive standard are available to the user. The safety module is only 35 mm wide and can be parameterized via a removable operator interface and display unit. Since the operator interface and display unit is not necessary for the actual operation of the basic device, it can also be removed in order to prevent manipulations. In addition, several PSR- Motionstop modules can share one operator panel, a cost-saving feature. Fast response time Response time in the event of an error is very important, particularly with regard to drive monitoring. In the case of highly dynamic movements, response times of just a few milliseconds are usually essential, since personal injury and system damage can only be avoided by detecting and deactivating a hazardous movement as quickly as possible. For the purpose of triggering the STO safe stop function, the PSR-Motionstop downtime and speed monitor is fitted with four safe, forcibly guided relay contacts and two safe digital semiconductor outputs. For further processing purposes, the fast digital outputs can be routed to the inputs of a safe controller or to STO/enable inputs of a frequency or servo inverter. Udo Tappe Never a wrong move PSR-Motionstop downtime and speed monitor The PSR-Motionstop downtime and speed monitor can be operated both with and without an operator interface and display unit Safely monitoring the movement of a machine is often more economical than switching it off completely for each setup or maintenance task UPDATE 3|12 11Technology