Service manual

SOI/DT 2005-01 dmm 599 36 82-59
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9.18 “FUCS” (Fast Unbalance Control System)
The control procedure for unbalanced loads is performed dynamically, before each spin cycle, as follows:
ª The phase begins at a speed of 55 rpm; the speed can never fall below this threshold, otherwise the
check is repeated.
ª At intervals of 300 ms, the balance is calculated and compared with predetermined limits. If the value is
less than the lower limit, the speed of the drum is increased by a certain value depending on the
transmission relation between motor pulley/drum; if the unbalancing is higher, it is decreased by the
same value. The reduction in the speed of the drum distributes the washing correctly; this procedure is
repeated until the wash load is completely balanced.
ª Correct balancing of the wash load is achieved at a speed of 115 rpm, after which the spin cycle begins.
The Unbalancing Control function takes place in different phases: each phase is characterized by:
ª an unbalancing index (0-1-2-3)
ª an unbalancing threshold value (ex: 350, 650, 850, 1200rpm)
ª a time out (max. time)
• Ending of the FUCS balancing phase
The phase is ended when:
ª The drum rotation speed is 115 rpm (or 85rpm in some cases of unbalancing index). In this case the
spin is performed.
ª In some cases the optimal balancing value is not reached: a reduced spin is performed depending on
the unbalancing.
ª In the worst case, in which all phases are not sufficient to reach a minimum balancing value, the spin is
not performed.
• Example of perfect balancing
Phase 0,
Time-out=60 sec
Phase 1
Time-out=60 sec
55 rpm
115 rpm
rpm
Real speed
Selected speed