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Motor and motor control
The motor control is also able to deliver the various instantaneous and
output values during constant speed, acceleration and retardation. These
values are used to calculate the weight of the loaded laundry and to detect
any load imbalances. A separate unbalance switch can also be connected
to the motor control.
When the drum in a drain sequence starts its acceleration from wash rpm
to distribution rpm, the extreme unbalance measurement will start once
about 90% of the distribution rpm has been attained. Subsequently, during
the entire remaining super unbalance measurement, the distribution time
and during the entire subsequent extraction time, the program unit will
detect whether there is any extreme unbalance.
In case of extreme unbalance that can arise if e.g. a spring strut is defec
-
tive or when washing in sacks, the acceleration will be stopped to wait for
the drum to stop. If extreme unbalance arises during:
a. distribution or during super unbalance measurement, the drain se-
quence will restart from the beginning. The number of restart attempts
can be changed in the system data but is usually set to 5. The value can
also be changed via configuration 2.
b. extraction, the program will stop and move to the wash sequence after
extraction.
The safety system of the machine includes double detection of the door
lock. Both the programme unit and motor control use different switches to
detect proper door locking. The motor cannot start unless both switches
verify the door is locked.
