Manual

E2 SERVICE MANUAL REV D 09/12
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Convection Fan Motor & Controller
Convection Fan Motor
The convection motor is a 3-phase AC motor
having a maximum speed of 3600 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.
Motor 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 360 rpm to 3600
rpm.
• Door Open, 360 RPM
• Door Closed (not cooking), 1080 RPM
• Door Closed (cooking), speed as specified by
program or setting up to a Maximum of 3600
RPM
LED Status display (A):
• Inverter Off/No supply, LED OFF.
• Power On/Ready, LED flashes ON/OFF x1
per second.
• Inverter Running, LED ON continuously.
• General Warning LED ON/OFF x2 per
second.
• Fault Condition, LED ON/OFF x10 per
second.
Convection Fan Motor & Controller tests:
9 Disconnect and isolate the oven from the
electricity supply.
9 Allow the oven to cool down.
9 Remove the oven casing.
9 Ensure that the High Voltage Capacitor is
discharged before commencing work.
9 Check the following:
1 Electrical supply into motor controller.
2 Three phase connections to motor.
3 Speed Controller connections to SRB.
4 Motor thermal cut-out (short circuit).
5 Motor rotates freely/not seized.
6 Motor winding resistances:
• Blue to Black ~36Ω
• Black to Brown ~36Ω
• Brown to Blue ~36Ω
• Black, Brown, or Blue to Earth — Open
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