Timing relays fullfil many functions in industrial environments. In automation technology, they are used to compensate for errors caused by high clock rates. Timing relays extend short pulses so that downstream control components can reliably detect them.
Task:
The filters in industrial vacuums become clogged after a time. The vacuum is run in alternating suction and pressure mode to clean the filter. It should be possible to change the intervals without changing the process controlprogram.
Solution description:
The different intervals for suction and pressure operation with the Weidmüller relay TFIS 12-240VUC 1CO CG are effected with a clock generator, and can be adjusted by the end user.
Benefit:
• Small size allows installation in tight spaces
• End user can set the intervals as needed
Task:
After the system is switched off, the extraction system should continue to run for a certain time to ensure that no sawdust remains on the machine.
Solution description:
The weidmüller timing relay TFIS 24-240VUC 1CO OFFC is used with function R off delay. The extraction system runs for the specified period of time and removes the sawdust. If the system is switched on during this time, the elapsed time is reset, and begins again from zero the next time the system is shut down.
Benefit:
• Save and cheap solution
• Protection of the plant from increasing pollution
• Increasing the service life
Task:
Switching on ventilation of a frequency-controlled drive motor on a contour cutting machine for plastic.
Solution description:
Additional ventilation for a frequency-controlled drive motor. The integrated ventilation is not sufficient at low frequencies (10 Hz), so an additional fan is used and is controlled by the timing relay TFIS 24-240VUC 1CO OFFC.
Benefit:
• Cooling of the motor is ensured
• Premature engine wear due to overheating is prevented
Task:
When the pools at a waste water treatment plant are filled to a constant level, this causes undefined states for the float switches (a „flutter state“).
Solution description:
The use of the timing relay TFIS 12-240VUC 1CO M7C with Function E (switch-on delay) delays the reading of the switch contact until the next usable measurement, and thereby prevents „flutter switching“.
Benefit:
• Minimisation of faulty triggering and maintenance costs
• Motor protection by reducing the number of unnecessary system starts
• Increased reliability
