Reminder from the Calendar of mugwa
http://groups.yahoo.com/group/mugwa/cal
Monthly MUGWA meeting
Tuesday May 18, 2004
7:30 pm - 12:30 am
(This event repeats...
Yahoo! Reminder
reminders@...
May 16, 2004 11:25 am
493
I received the printed copy of the article from Circuit Cellar. Looks good. Andrew ... this months...
Hello fellow Mugs I am having a bit of bother with turning a motor on an off with a relay. Oh I can turn it on an off all right. The problem is when I turn off...
Chris Holme
cholme@...
May 17, 2004 2:37 am
495
Hi Chris, Is the motor 240 V or low voltage? Ron... _____ From: Chris Holme [mailto:cholme@...] Sent: Monday, 17 May 2004 10:37 AM To:...
What type of motor are you turning on/off and what is the rating? The diode you mentioned is protection against backemf from the relay coil which prevents the...
Hello Andrew And Ron and others The motor I am switching is a 240 watt centrifugal fan The zero crossing thing fits as it only happens sometimes Power supply...
Chris Holme
cholme@...
May 17, 2004 7:25 am
498
I will be at the meeting this week. I think you will find the solid state relay a good solution for your application - unless you were looking to mass produce...
See you there and thanks Regards Chris Holme ... From: Andrew Smallridge [mailto:asmallri@...] Sent: Monday, 17 May 2004 3:40 PM To:...
Chris Holme
cholme@...
May 17, 2004 9:13 am
500
Hi all, Yes, I had a similar problem, although instead of it being "minor" and only interrupting the CPU, it was "major" and reset it. Damned near every time...
... I think Chris said he is using a schotky diode across the relay. In this case he only needs one unidirectional transport to absorb the negative transient...
... Yep. Although the transorbs are rated to handle a specific minimum energy (1500 Joules in the case of the 1.5KEnCA I think), while the shottky's aren't...
Hi all So, ignoring the fact that arcing is going to ruin the relay pretty quick (can I prevent this?) It seems to me that if I add a transorb to the relay...
Chris Holme
cholme@...
May 19, 2004 12:58 am
504
... You can reduce it to the point where it won't eat the relay in at least two years :-)... ... by using Resistor/Cap style mains suppression caps across the...
If you want to switch 2KW Inductive, my suggestion is to use the relay to drive a contactor that is designed to handle that sort of load long term Without...
Hi Dave, thanks for your raves Jaycar sells X2 caps from 10 to 470 nF. I assume that more capacitance = better suppression. For 240V 240W motor what would be...
Chris Holme
cholme@...
May 19, 2004 3:54 am
507
... To an extent. They also have an inherent "resistance" which needs to be factored in. Ideally this is done by measuring the load (motor) under various...
Thanks Dave. You save me heaps of research time. What do you drink? Regards Chris Holme ... From: David Emrich [mailto:dave@...] Sent: Wednesday,...
Chris Holme
cholme@...
May 20, 2004 2:45 am
509
What about one of these? Made by Clipsal. Din Rail Mount - Clipsal Power Range, Contactors 1 Module Wide, 240V 50Hz 20A at AC1, Coil 24 or 240Vac 2 NO...
For low quantity projects then by the time you factor in the cost of a contactor, mounting assembly, relay drives, filters etc, I think you would be better off...
One of the main advantage of contactors is that generally they will fail open circuit, providing you Have rated them adequately, so that they don't weld their...
Hi You guys probably have no idea how much discussion like this helps me. i learn things just by listening, my favourite way. Thanks to all and I reckon I owe...
Chris Holme
cholme@...
May 20, 2004 6:55 am
513
Providing it is done with discretion, I don't see a problem, but I'll have to check with the powers that be first. Ron... _____ From: Chris Holme...
Ta Regards Chris Holme ... From: ron.casotti@... [mailto:ron.casotti@...] Sent: Thursday, 20 May 2004 3:36 PM To: mugwa@yahoogroups.com Subject: RE:...
Chris Holme
cholme@...
May 20, 2004 8:18 am
515
... Caffeine... Four spoons coffee,... three spoons sugar. Milk & hot water optional. :-] Sleep? Who needes it!...
DUN Regards Chris Holme ... From: David Emrich [mailto:dave@...] Sent: Thursday, 20 May 2004 6:04 PM To: mugwa@yahoogroups.com Subject: Re:...
Chris Holme
cholme@...
May 20, 2004 1:10 pm
517
Hey fellow Mugs Just fitted a X2 cap to the output side of the relay and a 13.8 v unidirectional transorb across the relay contacts. No more annoying...
Chris Holme
cholme@...
May 21, 2004 9:00 am
518
Hi Chris, Did you mean a 13.8KV transorb? Andrew...
Hi all, Does anyone have experience with using offshore manufacturers for low volume PCBs? It looks like Circuit Cellar are going to publish another of my...
Hi Andrew, You might check out Futurlec. http://www.futurlec.com/ Look near bottom of URL page, just above Microchip magazine ad, They have a PCB service. I...
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