V/D
S
ERIES
M
ECHANICAL ASSEMBLIES
3-22 Revision: 2.1
3.3 Door lock
3.3.1 V/D-65 – 200
Principle
The devices are equipped with an automatic door lock. A locking ring
meshes with the door and locks it securely.
The controller then checks the correct procedure using a series of inputs
and outputs, thus ensuring safe operation of the device.
Closing
Closing procedure
The vacuum pump for locking the door runs for no longer than
30 seconds.
If the door is not properly locked, the closing procedure is
cancelled. To start the closing procedure again, open the door
and close it again. Follow the instructions in the display.
Manually pressing the door down triggers a chain of events to close and
lock the door:
− Gasket switch: A reed contact/microswitch tells the controller that the
door has been pressed.
− The vacuum pump then generates a vacuum in the sterilisation
chamber which pulls down the door fully.
− Door switch: A microswitch signals the end position of the closed door.
− Scissor lock: The pneumatic cylinder on the scissor lock moves
downwards and closes the locking ring. The vacuum pump runs on for
5 seconds.
− After a slight delay, the pneumatic cylinder of the locking shoe moves
up and secures the closed locking ring.
− Ring Close switches: Four microswitches query the position of the
closed locking ring and a reed contact on pneumatic cylinder Z2
queries the position of the locking shoe.
Only when the process is complete does the control unit report Ready and
the program can be started.
Opening
The door can be opened after the end of the program if the following
parameters are met:
− EndTemp: The set unloading temperature has been reached (or fallen
short of).
− ChamberPress: The pressure in the sterilisation chamber is in the
range ATMPressure – 12 kPa to ATMPressure + 4 kPa. ATMPressure
is the preset normal pressure for the location (
parameter 74).
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