Electrolux EWM 1000 Plus - 8. Fast Unbalance Control System (FUCS) 27; 8.1. Examples of operation of the unbalancing control function

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DGS-TDS-N07.2003 C.D. 599 51 74-13 EN
8. Fast Unbalance Control System (FUCS)
The control procedure for unbalanced loads is performed dynamically, before each spin cycle, as
follows:
- An initial phase is performed in which the direction of rotation of the drum is alternated at 55 rpm.
- 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 2 rpm; if the value is
higher, the speed of the drum is reduced by 2 rpm. 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 four phases; each phase is characterized by
an unbalancing threshold and a time-out (maximum time).
Phase 0: Phase 0 has a pre-determined unbalancing threshold; if correct balancing of the wash
load is achieved, the appliance performs a 470 rpm spin pulse, preceded by 5
seconds at 100 rpm and followed by phase 1; otherwise, after a maximum of 60
seconds, the cycle passes directly to phase 1.
Phase 1: The first phase has a different preset unbalancing threshold: if correct balancing is
achieved, the appliance performs the spin cycle, preceded by 5 seconds at 100 rpm. If
not, after a maximum of 120 seconds, the cycle passes to phase 2.
Phase 2: The pre-determined unbalancing threshold in the second phase is different: if correct
balancing is not achieved within 60 seconds, the function passes to phase 3.
Phase 3: The third phase has a pre-determined unbalancing threshold: if correct balancing is
achieved within 90 seconds, a spin pulse is performed, preceded by 5 seconds at 100
rpm and followed by a repeat of phase 1. If the load is highly unbalanced after the second
attempt for phase 3, the spin cycle is skipped; if balancing is not perfect, a reduced-speed
spin is performed.
8.1. Examples of operation of the unbalancing control function
The examples shown below describe the operation of an appliance with a final spin speed of 1000 rpm.
Perfect balancing
- Low speed
- FUCS phase 0
with spin pulse
- Low speed
- FUCS phase 1
- Normal spin