Welbilt Merrychef eikon e1s - Page 106

106
eikon e1s
Service and repair guide
LED flashes
Warning Type
Warning Condition
Recover Condition
1
Over voltage
Input power voltage >270V
Input power voltage < 238V
2
Under voltage
Input power voltage < 150V
Input power voltage > 160V
3
Software over current
More than 9A
Less than 9A
4
Motor over temperature
Temperature fuse open
Temperature fuse recover
5
IPM over current
Current more than 9A
Less than 9A
8
Hardware over current
Current more than 13A
Less than 13A
Table 3.8: Error causes and LED
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:
• Electrical supply into motor controller.
• Three phase connections to convection fan motor.
• Motor speed controller (convection fan) connections to
SRB.
• Convection fan motor thermal cut-out (short circuit).
• Convection fan motor rotates freely / not seized.
• Convection fan motor winding resistances:
− Red to Green 6-7 Ω
− Red to Yellow 6-7 Ω
− Green to Yellow 6-7 Ω
• Red or Green or Yellow to Earth (open circuit).