Door Interlock
Applications: Laboratories, clean rooms, money counting rooms, restricted dark rooms, computer rooms and more.
| Components |
| A |
Power Supply
Includes terminals for both input and output devices, plus a battery backup system.
|
| B |
Lock
Locking device with sensor that detects when door is in closed position.
Example locking devices:
Electrified lockset
Magnetic lock (shown in diagram)
Electric bolt
The sensor is a critical component to this system. Since only one door may be open at a time,
the power supply must know when each door is in the closed (locked) position.
|
| C |
Input Devices
Sends a signal to the power supply to unlock one door.
Example input devices:
Keypad
Card swipe
Key switch
|
| D |
Override Switch
On/Off switch that controls the entire system (typically a key switch).
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Operation:
When system is ''at rest'', both doors are closed. Door 1 is locked and door 2 is unlocked.
Upon approaching Door 1, the user enters a code in a keypad (or other input device). A successful entry will cause Door 1 to unlock.
Before unlocking Door 1, the power supply signals Door 2 to lock. A sensor on Door 2 will signal the power supply when Door 2 is locked,
thereby ensuring it is safe to unlock Door 1.
The user enters the vestibule area and waits for Door 1 to close and lock. Once Door 1 is back in the locked position, the power supply
will cut power to Door 2, thereby allowing the user to pass from the vestibule.
Notes:
1. When a user approaches the vestibule from the Door 2 side, they gain immediate access to the vestibule since Door 2 is unlocked when the system is ''at rest''.
After entering the vestibule, the user will enter a code at Door 1 to tell the system to unlock Door 1. The system will then lock Door 2 before unlocking Door 1.
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