Fucs ( Fast Unbalance Control System) - Electrolux EWM3500 Service Manual

9.11 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 may not drop below this threshold; if it does, the check
is repeated.
At intervals of 300 ms, the balance is calculated and compared with established limits. If the value is lower
than the limit, drum speed is increased by a certain amount that depends on the transmission ratio between
the motor pulley and the drum. If unbalance is greater than the limit, the speed is decreased by the same
amount, which enables the laundry to arrange itself correctly. The process continues until the load is
completely balanced.
Correct balancing of the load occurs at 115 RPM. After this speed is reached, the spin cycle begins.
The unbalance control procedure may be performed in a number of phases. Each phase involves:
an unbalancing rating (0-1-2-3)
an unbalancing threshold (ex: 350, 650, 850, 1200g)
a timeout
•
Conclusion of the FUCS procedure
The FUCS procedure is considered to be concluded when:
The speed of drum rotation is 115 RPM (or 85 RPM for certain unbalance ratings). At this point, the
scheduled spin phase is carried out.
In some cases, optimum balance is not reached and the spin is performed at a lower speed that depends
on the level of unbalance.
In the worst case scenario, a minimum level of balance is not achieved after all the FUCS phases have
been performed and the spin phase is skipped.
• Situation of ideal balancing
Phase 0,
Timeout = 60 sec
55
RPM
SOI/DT 2007-02 dmm
Selected speed
Phase 1
Timeout = 120 sec
115 RPM
55/66
True speed
599 38 61-92