Convection fan: motor speed controller control voltages & link positions.
Link positions are factory pre-set based on the model
of convection fan used in the conneX ovens. The link
positions must not be altered without express
instruction from Merrychef.
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. All associated wiring and connections, from IO board X113 & X519 through the speed controller to the convection
fan motor.
2. Convection fan motor thermal cut-out (IP), two black wires.
3. Convection fan motor rotates freely / not seized.
4. Convection fan motor winding resistances:
Blue-red 7.5 Ω 10%
Red-yellow 7.5 Ω 10%
Yellow-blue 7.5 Ω 10%
Blue or red or yellow to earth (open circuit).
5. With the oven panels refitted and the oven re-connected to the power supply check the fan speeds using visual view
in the service mode.
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