This is a cheap general purpose DIN rail mounting time switch I bought from eBay, purely to take a look inside to assess the quality of construction. It's branded Oktimer with a model number of THC15A.
Thge internal construction is actually quite good. Visually it's on a par with higher profile branded units. The circuitry also has a really neat trick to simply the regulation of a 24V supply. It uses a capacitive dropper followed by two options. The relay coil which pulls the voltage down to about 20V and a resistor which is switched on whenever the relay isn't, thus providing a very simple way of regulating the voltage with all the heat dissipated from a robust but cheap resistor. The resistor dissipated about 400mW.
It looks like the control module is capable of other functions, but I'm not sure what they are. There are two [pairs of linkable pads on the back and eight separate button inputs.
The ebay listing I got this from is http://www.ebay.co.uk/itm/141614784101
Thge internal construction is actually quite good. Visually it's on a par with higher profile branded units. The circuitry also has a really neat trick to simply the regulation of a 24V supply. It uses a capacitive dropper followed by two options. The relay coil which pulls the voltage down to about 20V and a resistor which is switched on whenever the relay isn't, thus providing a very simple way of regulating the voltage with all the heat dissipated from a robust but cheap resistor. The resistor dissipated about 400mW.
It looks like the control module is capable of other functions, but I'm not sure what they are. There are two [pairs of linkable pads on the back and eight separate button inputs.
The ebay listing I got this from is http://www.ebay.co.uk/itm/141614784101
DIN stands for Deutsche Institut fur Normung, which translates loosely as “German Institute for Standards.” DIN is a German organization that establishes standards for industrial and electrical equipment.
if they need to add solder to a track, is because you have the wrong PCB thickness. That doesn't make it robust, it makes it unpredictable. For example, you have no clue what is going to happen if you have 5k volts
frustrating. how to set the present time?
I love these but as new units that just arrived, I occasionally need to replace the battery as they have been in the warehouse for a long time 😅
I use this exact identical relay to witch my back yard's garage lights, been working for a full year now. its amazing. I should also mention the total brainfart I had with this timer. I thought that you feed 220v from above and then you connect the load in the bottom and the timer sends power trough the timer and out the bottom contacts. I swear to god I was trying to solve this non-existent riddle of how and why the thing did not work, only then, after two hours, I realized. It does not send power trough itself, you have externally feed the switching contact. Jesus Christ. Been in Electrical field for 2 years now. Im ashamed.
To be honest All of you my friends Chinese lot of stuff is making grbidge
The relay seems to have a standard package/pinout, so in case of damage/quality issue, you can replace it with an expensive brand one.
Glade I could find your work, I have one of these timers that has blown the input capacitor and cooked the accompanying resistor. Do you perhaps have these two values for me. I would like to repair this unit, it is a 220v input timer. This happened from new so it's a new component failure. You did refer to the cap being 330nF at 630v, I think the res should be 550ohms . Hope you can assist with my rebuild.
the real timer is quite expensive compared to this one .We have used them for controling lights ventilation and believe it or not proofing ovens for bread ..We use the timer to control a contactor with a 120v coil ..They last pretty long considering the way they are made very reliable but pain in the but to read and program especially when you can't see the screen because of flour grease and all the other stuff floating around the bakery .Sometimes we just use an old style mechanical clock work timers but they really him up with stuff in the air .these don't .they each have their applications
Put one of those anywhere near contactors and it'll fire when the contactor closes sometimes… Banged my fucking head against a wall with that one for a month.
Edit: also of note, if you have an input on a raspberry pi, a contactor close will make the pi think a signal has been received… It's a very very tiny pulse but the pi counted it – I suppose you could do stuff with capacitors etc to stop that, but I just sorted it in code since the signal input is so short.
Mine arrived and the display was not on like all the videos I've watched. The instructions state to connect to power and let the the battery charge before hitting the reset button. I've had mine hooked up to power overnight and I still have nothing. It the light meant to be on when connected to power? Maybe I have a dud 🙁
I have this timer(got from aliexp). Using it to control the Air conditioner(1000w) and still working okay since 3+ years.