Fucs" (Fast Unbalance Control System) - Electrolux WASHING MACHINES Service Manual

10.17 "FUCS" (Fast Unbalance Control System)

The control procedure for unbalanced loads is performed dynamically, before each spin cycle, as follows:
The phase begins at a speed of 55 rpm; the speed can never fall below this threshold, otherwise the
check is repeated.
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.
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:
an unbalancing index (0-1-2-3)
an unbalancing threshold value (ex: 350, 650, 850, 1200rpm)
a time out (max. time)
•
Ending of the FUCS balancing phase
The phase is ended when:
The drum rotation speed is 115 rpm (or 85rpm in some cases of unbalancing index). In this case the
spin is performed.
In some cases the optimal balancing value is not reached: a reduced spin is performed depending on
the unbalancing.
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
55 rpm
SOI/DT 2005-01 dmm
Selected speed
Phase 1
Time-out=60 sec
115 rpm
49/67
Real speed
599 36 82-57