Service 17
2.10 Grinders – grinding degree and motor cooling
Important note for technicians
o Due to the fine degree of grinding and the longer grinding time, it is necessary to actively cool down the motor.
o The two installed fans perform the function of motor cooling and cool the bean hopper as well
2.11 Grinders – idle current calibration
The grinders have been set to a default value at the factory and must be set up for the
customer-specific types of bean and beverages during commissioning of the machine.
See Attachment WMF espresso Basic beverage settings
With specially hardened grinder disks and the powerful grinder motor, these grinders can
achieve a very fine grinding degree, with a grain size distribution down to a minimum of
190µm.
Factory settings:
Grinding degree 3 -> approx.: 1.6 g/s and a grain size distribution of about 280µm
Menu -> Service -> Service routines -> Idle current calibration
starting for grinder 1 or grinder 2.
Follow the animation - lock the bean hopper (see left illustration) and measure the
idle current. After successfully carrying out the idle current, open the bean hopper
again and dispense a test beverage in order to fill the grinder.
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