It is best to have pictures, the effect is to achieve this, power, light does not shine, press the button switch, 15 minutes after the light, then press the switch, the lights and then off, do not press the lights immortal. Can not achieve such a procedure. The relay is energized.
When the button is pressed, the relay is energized, open the contact self-locking button, the relay has been power, delay 15 minutes later, the delay contact action, light, then open the contact action to make the relay power failure, Back to the original state, the light has been bright. When the button is pressed again, the relay is energized, the light is off, the delay is bright and so on.
Will be a normally open contact with the button switch in parallel, one end of the other end of the power supply connected to the end of the electrical line packet, the other end of the line package in series delay to open the contact and then the other power line, the relay time adjusted to 15 minutes, Close the contacts to control the lights.
Now the electronic time relay does not perform the normally open contacts, can not complete the LZ requirements, if there is a reset contact can be (button to reset the contact, that is, the relay delay 15 minutes after the lights, when the button when the relay reset Light off, wait until 15 minutes and then bright, that is, a light off for 15 minutes). However, if you use a balloon-type time relay can meet the requirements of LZ, because the relay has two delay contact and two normally open contacts and two normally closed contacts.
