Control Panel Advice

[andyskin]

I've build a simply control panel at work to control conveyor belts, the conveyor belts are controlled by push buttons simple stop/start. before you can start the system you must reset two cat 4 safety relays one for e-stops and one for interlocks, then you can press the button for a pre-start siren to go off, which then sends power to the push button so you can start the system. is there something I can add so when the pre-start goes off you must press a push button within 30 secs or so. if you don't your got to start the whole process again. Cheers Andy

[RussB]

Yes, another push button and timer.

[MrAutomation]

Use a timer relay. When you press the Pre-Start button, the timer relay should be energized temporarily by the button. The timer relay should then seal itself in (You may need a second relay for that). If it reaches it's limit, it's N.C. contact will open and kill power to the buttons, and the whole panel will reset. If the start button is pressed, an N.C. contact on that circuit will kill power to the timing relay, causing the seal-in circuit to drop out, and the panel will run as normal. This might require more than one relay, depending on the existing panel design you have.