Example applications for timing relays

Compact timing relays for building and factory automation

Timing relays fulfill 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.

TFI-SERIES - Reliable control of time functions

Our TFI-SERIES consists of five different devices covering the most important applications in building and factory automation. Four of these carry out individual functions: clock generator (pause and pulse start), star-delta switch, on-delay and off-delay with control input. There is also a multifunctional version with seven different timing functions. The timing functions and time ranges can be easily configured using a rotary switch fitted on the front. All of the devices meet the international standards according to EN 61812 and have UL approval for the North American market.

Simple configuration via rotary switches
Compliance with international standards according to EN 61812
UL approval for the North American market
Available in installation design and compact industrial design

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Industrial vacuum filter cleaning

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 control program.

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

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Extraction system

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

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Plastic contour cutting machine

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

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Fluid level monitoring

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:

• Minimization of faulty triggering and maintenance costs

• Motor protection by reducing the number of unnecessary system starts

• Increased reliability

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