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:
4
.
Item
2
4
6
description
Three phase connections to convection fan motor.
Convection fan motor thermal cut-out (short circuit).
Electrical supply into motor controller.
Motor speed controller (convection fan) connections to SRB.
Convection fan motor rotates freely / not seized.
1
3
5
Convection fan motor winding resistances:
Blue-Black 9±5%
Ω
Black-Brown 9±5%
Ω
Brown-Blue 9±5%
Ω
Black or Brown or Blue to Earth (open circuit).
21
