10.5 Mains voltage components (casing removed)
Convection fan: motor
The convection fan motor is a 3-phase AC motor having a maximum speed of 7200 rpm controlled by a
motor speed controller.
The windings are thermally protected and in the event of a thermal fault a trip inside the motor will
operate and shut down the motor speed controller.
Convection fan: motor speed controller
The convection motor speed controller provides a 3-phase AC switched mode drive to the convection
motor and is controlled by a 0 - 10 Volt signal from the SRB.
This allows the motor to be adjusted from approximately 1500 rpm to 7000 rpm in steps of 5%.
Door open, 1500 rpm (20% @ 2V).
Door closed (not cooking), 2190 rpm (31% @ 3.1V).
Door closed (cooking), speed as specified by program or setting up to a maximum of 7000 rpm (100%
@ 10V).
Convection fan: LED status display
Inverter Off / No supply, LED OFF.
Power On / Ready, LED flashes ON/OFF 1x per second.
Inverter Running, LED ON continuously.
General Warning, LED flashes ON/OFF 2x per second.
Fault Condition, LED flashes ON/OFF 10x per second.
Convection fan: motor and motor speed controller tests
Ensure the following requirements have been met before starting the test:
The appliance has been disconnected from the power supply and protective measures have been
taken to ensure the power cannot be switched on again.
The appliance is cool.
The high voltage capacitors are discharged before commencing work.
Anti-static precautions have been taken.
The casing of the appliance has been removed.
Check the following:
1.
Electrical supply into motor controller.
2.
Three phase connections to convection fan motor.
3.
Motor speed controller (convection fan) connections to SRB.
4.
Convection fan motor thermal cut-out (short circuit).
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