Coltene SciCan BRAVO G4, Technical & Service Manual

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Sterilizers Bravo G4
- TECHNICAL MANUAL
94
TECHNICAL SHEETS EN
7.4. TECHNICAL SHEET ST04 - PRESSURE TRANSDUCER - SAFETY PRESSURE
SWITCH
PRESSURE TRANSDUCER
The pressure transducer detects the internal pressure during the various cycle phases and generates an electrical
signal that is sent to the main PCB.
WARNING:
No repair interventions can be performed on the pressure transducer.
WARNING:
The service activity on this component requires the side covers removal. Once the intervention
has been completed, correctly refit all covers and carry out the SAFETY TEST (including
dielectric strength and ground continuity tests).
Should it be necessary to replace the pressure transducer:
- Remove the right-side external covering panel.
- Remove the protective cover of the main PCB, which is held in place by 5 snap locks and a screw.
- Fully unscrew the locking ring nut from the support and from the lower fitting.
- Disconnect the transducer wiring from the main PCB.
- Loosen the retaining nut of the transducer and slide it out of the support.
- Place the new transducer in the relevant seat and secure it with the nut.
- Reconnect the transducer wiring to the main PCB, making sure to correctly position the connector.
- Cut the final part of the TEFLON pipe, removing the section previously inserted on the fitting.
- Insert the TEFLON pipe on the fitting, locking it with the retaining ring nut.
NOTE
This operation must be performed making sure that the tightening is not excessive, in order to
prevent any damage to the pipe.
SAFETY PRESSURE SWITCH
The safety pressure switch stops the power supply to the door closing system unit when the pressure is positive
inside the chamber.
With pressure values below 0.40 bar, the pressure switch:
- Is not activated.
- The power contact of the gearmotor is closed (red and white wires).
- The safety contact is open (red and black wires).
- The door motor-driven opening can be activated.
With pressure values above 0.40 bar, the pressure switch:
- Is activated (safety condition).
- The power contact of the gearmotor is open.
- The safety contact is closed, short-circuiting the gearmotor control relay.
- The door motor-driven opening cannot be activated.
SERVICE OPERATIONS
WARNING:
Before performing any type of operation on internal components, turn off the autoclave
and disconnect the mains cable.
WARNING:
No repair interventions can be performed on the safety pressure switch.