Automatic Door

Are you designing a door? Because these type of doors come as a complete package. A motion sensor is use above the door to open it. As far as the switch goes that shuts the sensor down. Wouldn't it be nice if the person that locks the door turns it off. So how about on the door? Like every one else they place it on the frame above the door on the inside.

Ozzb:

Not only a door, I am making a minimum engineering requirements for the designers. They will build up the plant base on my idea. This takes me a lot of time and study.

The door I am mentioning about is the office's main door. I also have a security house at the main gate. I wonder if I should run the circuit to this security house to swith on/off the door during non-working time. I understand the general principle but I dont know how it function actually.

I understand that this site is for engineer's matter (and I am) but sometimes we also think of the smallest things and they just can be shared with the "
"insiders". Because I cannot say to my colleagues that I dont know.

Regards,

By an auto door if you are talking about the type that slide open placing the switch remotely at the security house is a little over kill. These doors if the sensor is not switch on will easily slide open with a little pressure. Sensors on the door that keep it from closing on some one and causing harm will open it. Even with out power the door panels will swing out as safety egress during a fire.

Also if the switch is placed in a remote location if switched on before it is unlocked can cause difficulty in getting it unlocked. The door lock bolts with a hook and pressure from the auto function can make it difficult to unlock. It will want to open as you walk up to unlock it. If done that way the person unlocking then has to call security to turn it on and turning it off to get to close to lock it.

Also if accidentally the switch is turn on during closing hours and locked may cause premature failure of the motor that opens it. The motor is not that strong to keep it from hurting someone if the safety sensors do fail. It struggling to open against the lock will reduce the life of the motor. Any motion in front of the door will cause it to want to open. Some times even a small bird scavenging in front of it.

If placed inside above the door it is turn off to get the doors to close to lock them. Then turn back on after unlocking them.

Hi, guy,

You can try to install a contactless card reader for the access control. The reader can be linked up to an electric door lock with priority access features. You can program the office hour, time for staff to enter to the office or even who is allowed to enter to the office after or during office hour. It is really an intellegent device with high tech features at reasonable cost. It is also an web enable device that you can connect to your company network so that you can access to the entry record wherever you are by a web browser.

Steve To

Just put a timer in the circuit. It can get confusing for anyone so don't be afraid to ask some forget that in some fields they may have to ask too. If I understand what you are asking it should be straight forward. The timer circuits can get a little confusing at times but there is plenty of info or should be that comes with your specific setup. You simply open up the circuit during the times you do not want the door to work. Wire it in series with the circuit and set the timer. I would think you are working with digital circuits if so depending on the logic you program the logic for example ladder logic you can add a timer that is normally open that closes the circuit at 8 and opens it at 5. If you are working with relays and analog circuits just wire the timer in series with the coil on the relay in other words the timer will feed the coil and activate and or drop out the relay when needed.

Proximity sensor is all you need for your door. If you want to function it between that time, you may have to put a timer circuit in series with it.

All good answers, but first you must state that to your co-workers that you are not as knowledgeable with the control circuits of this project just like you have told everyone here.

Security is the first issue, what happens if the circuit is switched on by accident as stated in an earlier reply?

Does security lock the door after working hours?

Why do you want a timer? Is it something someone has thought of and now you want to make it happen?

Have you thought of this..... in the door control circuit there is a timer to close the door, only stopped by a proximity detector to stop the door closing while someone is walking through the door. By placing a timer in the control circuit, you might just cut the power and the door will not close.

As security have to lock the door because the door is not secure when closed, that means they have to walk to the door and throw the lock, why can't they turn the door off? The problem you have designed for your self is way over the top and unnecessary, not to say costly in time and materials, and then, if it does work, you still have to send Security to lock the door in the evening after work and unlock in the morning before work.

I'm not sure which country you are from, but take a look at the large stores that have automatic doors. At closing time, they have someone switch off and lock them.

Make life easy for yourself and do the same.

K.I.S.S... Keep It Simple Stupid!

I positively agree with Brich, Yes, in our primitive country, there are many automatic sliding doors packaged with proximity sensors that trigger the opening of door. When our proximity sensors went wrong and no available stock for replacement we retrofitted and put a weight actuated limit switches to switch on the pneumatic powered door. If the asker would like to trickle and play with his design automatic door by integrating timer circuit to cut power to the pneumatic or electrically powered door opening, he can do so. It his discretion. But security speaking, he should consider manual overrides to open the door during emergencies.

"I'm not sure which country you are from, but take a look at the large stores that have automatic doors. At closing time, they have someone switch off and lock them."

Yes the do, they come with the switches from the manufacture . They are installed in the frame over the door. After making fast to the opening and leveling the only thing other thing needed to install them is providing power.

all u need for this is a door,IR sensors(transmitter n receiver), a controller (plc, micro), a motor (stepper) and a pulley.....u gotta design a program in the controller such tht when ir sensors r de-energised (blocked by a person) , the controller should energise the motor in forward direction for fixed no of steps and then in reverse direction for same no of steps........when motor rotates the pulley attached to it rotates ...connect the door to the pulley through gear mechanism......so when pulley rotates in forward n reverse direction the door will also rotate in forward n reverse direction.....

Putting a timer is the easiest, but then it should also cater for the weekends, you don't want the doors to open if someone walks past when nobody is at the company on a Sunday morning. Fire and safety is an issue and there should be a local override inside. Placing a remote switch makes it complicated, especially for security personnel or the cleaners. Plus this remote switch will have to be monitored continuously to prevent manipulation. If there are utility power failures then your timer will need continuous resetting.

Consider just locking and unlocking it in the standard way, this may be more reliable and safer long term

Well, if you are still taking comments here, I have a few.

If you can share a little of the basic design criteria, I may be able to offer something.

What country are we talking about? Varied jurisdictions have varied rules. What type of building (office, school, hospital)? Is access control (in or out?) part of the concern? Is life safety part of the concern? Is this opening part of a vestibule? If yes, are you controlling the inner or outer door?

What type of function is this door? Slider, swinger, balanced door, revolving? What size (sizes) is/are the leaves?

Does this door function as an environmental barrier (probably yes, just asking). If yes, what type of environment does it isolate the building from?

I know these seem like a number of questions that might not affect the electronics, but all of these points (and many more) will have some bearing on a complete correct suggestion, and subsequent solution.

Doorman and the others:

Thank you for your detailed explanations. However, don't go too far from my previous question. I am making the minimum design requirement so I just wanna know if I should put the control switch at the security door. As you could see that I don't know the actual operation of the door and adding a switch seems to be my precaution. However, it is unnecessary.

So, all I need is to have the security to lock the office door in every afternoon. So I will put in my requirement that "the office door shall be automatic control and sliding type. It will remain closed during OFF time". The professional designer will know how to do with this and that is all.

I suggest closing this topic here and thank you for your supports.