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B CLASSIC / B FUTURA / S CLASSIC - TECHNICAL MANUAL
TECHNICAL DATASHEET
5.3 TECHNICAL DATASHEET ST03 - DOOR GEARMOTOR ASSEMBLY
The autoclaves are equipped with a motorised door closing and locking device that uses a endless screw and is driven
by the door gearmotor.
The door servomotor assembly is secured to the left side the chamber and can be accessed after removing the right
side panel.
The servomotor assembly includes a vertically mounted gearmotor, that drives a horizontal drive shaft ending in a
endless screw with trapezoidal section.
When in motion, the endless screw runs into the threaded bushing installed on the porthole cross member, bringing the
porthole closer to the jamb until it closes and the door is locked.
To ensure quiet running and improved strength, the shaft turns in a thrust ball bearing positioned inside the front sup-
port of the servomotor assembly.
The servomotor assembly is operated by the porthole, when the operating pin hits the door approaching microswitch.
During this rst closing phase, the servomotor assembly moves forward due to a mechanical effect; it slides on steel
pins and is supported by a sliding plate made from the anti-friction material; the closing phase ends when the door
closed microswitch trips and stops the servomotor.
When the cycle is started, the gearmotor is activated; power supply current is controlled so that when it reaches its
maximum value at 3.2A, the system is stopped.
Upon reaching the rst vacuum pulse, with a negative pressure of -0.80 bar, a further door closing motion is performed
(about ½ shaft rotation) to ensure perfect sealing.
The opening control enables the servomotor to move backwards and release the door, which is moved away from the
chamber thanks to the thrust action of the operating pin; during this phase, the door closed microswitch and the por-
thole approaching microswitch are de-activated.
SERVICE OPERATIONS
WARNING:
Power off the autoclave and disconnect the power mains cord before removing the side
covers.
Replacing the gearmotor
- With the door open, remove the Benzing snap ring on the rear end to release the gearmotor from the drive shaft.
- Withdraw the gearmotor carefully, sliding it towards the rear end, without removing the front retaining ring and the
preload washer.
- Ensure that the front retaining ring and the preload washer are correctly in place and insert the new gearmotor on
the splined shaft
- Apply moderate force on the gearmotor and insert the snap ring at the rear end, making sure to locate it into the
groove in the shaft, so as to lock the gearmotor in place.
Replacing shaft/endless screw
- With the door open, remove the Benzing snap ring on the rear end to release the gearmotor from the drive shaft.
- Withdraw the gearmotor carefully, sliding it towards the rear end, and remove the front retaining ring and the preload
washer.
- Remove the 4 screws that secure the complete shaft support plate to the servomotor support. For models equip-
ped with vacuum pump EVO10/EVO 30, you will need to remove the pump from the autoclave to facilitate
this operation.
- Withdraw the support, complete with shaft/endless screw, operating pin, sliding plate and pins, thrust ball bearing.
- Insert the new complete support and make sure to check the thrust ball bearing and operating pin are in the correct
positions; secure support with the retaining 4 screws.
- Insert the front retaining ring into its seat, insert the preload washer and t the gearmotor onto the splined shaft.
- Apply moderate force on the gearmotor and insert the snap ring at the rear end, making sure to locate it into the
groove in the shaft, so as to lock the gearmotor in place.
Replacing the door closed microswitch
- With the door open, note the position of the 2 wires and disconnect the wiring from the microswitch.
- Remove the 2 microswitch retaining screws and their washers.
- Position the new microswitch, secure it with the 2 screws and their washers, connect the wiring.
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