Build A Contactor/relay Avoid Light Timer Failure
Posted 12 August 2002 - 10:45 PM
If anyone wants a to switch a smaller current up to 16A
You can buy a Horstmann 425 Coronet Central heating controller (single pole mechanical type) from any good electrical retailer for about £20+
All you need to do is buy a 4 way extension lead ( about 5 meters length ) take the plug off and connect these wires into the output terminal on the unit . Just get another length of 3 core mains cable (13Amp length about 3 meters) connect it into the input terminal on the unit and attach the plug to the other end. Get a small peice of wood and screw the unti unto it.
You now have a 24 hour timer that can switch up to 16A.
Posted 13 August 2002 - 01:08 AM
I read your timer relay thread with quite a lot of interest as I'm a newbie to this I was wondering about the surge taken, amperage wise, when cranking up HPS lights.
I also noticed that on your finished product you have a nice mains cable protector/clamp leading into the casing. I mention this as on another D.I.Y project on this site, converting the low bay type hps light, the mains cable is going through a hole in the metal casing with no grip/protection or anything, i feel for safety sake a rubber grommet should be used at least.
I only mention all of this as a safety precaution to anyone out there attempting anything like this as volts JOLT but amps KILL!
Posted 16 February 2003 - 05:07 AM
I found this post very informative, and thought I could add to it by supplying a specific part number, for a timer switch that is rated at 13A (Resistive) 5A (Inductive). Maplins sell one for £14, and is part number VJ58N. They do mail order too, so if you dont have a store near you...
My first post!!
Posted 15 March 2003 - 04:30 PM
A mate of mine has been messing around with Diodes and reckons that a industrial type IE one from a street light is able to cope with the Inductive load
If thats the case
Im not a electronics buff
but would a Diode negate the need for the manual switch
it could be fitted between the timer and the power out side
a heavy duty diode of that type is about £1
if itll work then u cannie get no cheaper than that can u?
Posted 22 June 2003 - 09:50 PM
Can switch up to 400W without a relay.
Price: £15.00 [22,14 Euro]
Posted 17 July 2003 - 01:07 AM
If you are like me and need heat sometimes when the lights are off
Why not re-wire your contactor to have another socket , a NIGHT one ?
The Night socket is where u plug in your heater(s) and it only gets
switched on when your lights are off .. handy for propagators too.
To expand all you need is another length of 3 core cable and a socket to
wire it to.
The diagram is pretty clear but any questions just post
Posted 17 July 2003 - 01:44 PM
PRS (Dale St. Liverpool) have surplus (but new) 10A relays at £2.50 and £3. One type needs a base, the other doesn't and has spade connectors. They're controlled by 12v, so a cheap option if you've got a 12v mains adapter going spare. 3 contacts, so 30A possible.
Don't know if they'll do mail order, but I'll ask if anyone is interested.
Posted 05 August 2003 - 10:45 PM
Also as a rough guide if your unable to obtain the start up current from the manufacters, multiply the lamps wattage by 1.8 and use this figure to calculate the current rating required
This post has been edited by Themadhippy: 05 August 2003 - 10:46 PM
Posted 16 September 2003 - 06:20 PM
The short version is I was a fool ... the timer blew, and now I have to switch on the lamp about 6am in the morning ... every morning
Thinking of giving the building a look into ... looks fun and cheaper than buying.
Posted 01 October 2003 - 02:57 PM
they havent got JG54 in stock, and the thing is, I need a contactor NOW (i have a half flowered clone under a 70, and want to get it under the 250 ASAP)
its QC81C im looking at, will any double pole 10a 230v 8 pin relay do???
there are two bases too, would it be a PCB or a DIN socket i want???????
does anyone know anywhere else i can get cheap relays online????? ive been searching ages but cant find anything (all i can find is links to bloody search engines)
This post has been edited by BushDoctoR: 03 October 2003 - 06:21 PM
Posted 04 October 2003 - 11:35 PM
all that matters is its a 230v ac coil,and the switch contacts are rated for 10 amps at 230 volts(or more) A.C
not so cheap but
TLC stocks em as does cpc
but the best bargin maybe here look for Ref: Q0036,16A/25OVAC 2P C/O ex-equipment Push-On terminals.
din rail,if theres an option go for top hat,its the most common type