Safety controller receives new functions
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Pilz Automation Technology product story
Edited by the Engineeringtalk editorial team
May 2, 2007
New software allows the PNOZmulti safety controller to be used to monitor for broken shearpins on applications such as hoists.
New speed monitoring modules and updated Configurator software (version 5.1.0) together result in additional monitoring functions for the Pilz PNOZmulti configurable safety controller.
The PNOZmulti can now be used to monitor for broken shearpins on applications such as hoists.
Previously this might have required two encoders to be used - one on the motor and one on the driven shaft - to check for any speed differential, but the new speed monitoring modules can perform this function much more easily and at a lower cost.
This is achieved by means of the usual encoder on the motor and a PNP sensor on the driven shaft.
Software running on the PNOZmulti base unit analyses the signals from these two devices and initiates appropriate action in the event of a broken shearpin being detected.
This enhancement allows the PNOZmulti and speed monitoring modules to be used for economical safety-related control systems conforming to the requirements of BS EN 954-1 Category 4.
The second new function added to the speed monitoring modules and software is a time delay for over-speed tripping on start-up.
Some machines with high inertial loads will typically over-speed on start-up, before quickly settling back to their normal running speed.
To avoid the speed monitor identifying this as a fault condition, the Configurator software can now be used to set an over-speed detection time delay following start-up.
Two versions of speed and standstill monitoring module are available for use with the PNOZmulti controller.
While the PNOZ ms1p operates with a 5V encoder, the PNOZ ms2p accepts any incremental encoder input with a differential output from 0.5-30V, which gives machine designers a wider choice of encoders and makes it easier to upgrade existing machines on which encoders are already installed.
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