| ??? 07/14/05 00:55 Read: times |
#97292 - More info please Responding to: ???'s previous message |
There are two conditions that can cause you problems when using relays. 1/ when you turn it on - as mentioned by Andy, the relay draws a peak current for a short amount of time. Depending on your specific details, you power supply may not be able to supply enough voltage for the cpu - thus causing it to reset. 2/ when you turn it off - relays are inductors (as mentioned by Andy). Due to the effects of electromagnetism, the coil will try to maintain the same current through it (even though we've removed the voltage) and in attempting this, we get a high voltage spike called an 'inductive kickback'. This spike can also upset the cpu. If your 'standard' relay is DC, we put a diode across the coil to soak up this spike, if it is AC, we put a varistor across it. As for your 'standard' relay - depends on which standard we're talking about! My Omron relay catalogue has many 'standard' relays. If you can be more specific about your relay, voltages,what you're switching etc then we can better guide you. |
| Topic | Author | Date |
| Relay noise | 01/01/70 00:00 | |
| not everywhere | 01/01/70 00:00 | |
| Big inductors! | 01/01/70 00:00 | |
| More info please | 01/01/70 00:00 | |
| Power and Ground | 01/01/70 00:00 | |
| diode | 01/01/70 00:00 | |
| no need to mention it | 01/01/70 00:00 | |
| Solved! | 01/01/70 00:00 | |
| transistors survive and fail too | 01/01/70 00:00 | |
| Learning Years | 01/01/70 00:00 | |
The More I know Realises How Less i Know | 01/01/70 00:00 |