P.30
power, the most power of heating at 90
℃
is in the range from 1800 watts to 2000 watts
and 1000 watts at 60
℃
.
The heater can't heat without water, so firstly the heating function will start only user
selects the heating procedure, and secondly heating function is in some special procedure
to avoid unreasonable heating, and thirdly when water level is up to the set level, its
function will operate. In addition, there is the melting device in the heater, and when the
temperature is up to set value(usual setting 160
℃
), Fuse is fused and cut off power supply.
4.18 Filter
The power change of drum washing machine is in
the scope and larger, and in order to prevent its
interference on the other household appliance and
interfered by the other large appliance, the filter is
installed in the washing machine by CCC
certification requirements.
Filter is made up of a group of capacitance (usually
three), a group of inductance and a resistor. In the
power supply circuit, it can inhale the high-order
harmonic from washing machine and earth.
The interference is from the high-order harmonic from the power changes of washing
machine as well as the disorders and alternating magnetic field according to the
continuous changes of the current in the power cord. The frequency and magnitude of
change of its power is in the scope and larger that is from zero watts at soak to hundreds
of watts at wash, rinse and spin, to nearly 2000 watts at wash with heating. This change
more easily aroused the obvious voltage fluctuations in the domestic circuit which effects
the normal use of other electrical appliance. These filters can filter out high-order
harmonic and earth.
EMC stressed interference and anti-interference, and as for washing machine, it is
important to reduce interference to others due to it has good anti-interference.The
washing machine use alternating current that can pass capacitor, and in practically, filter
will have a very small leakage current (generally less than 2mA). Good grounding is the
guarantee of the safe using this machine.
And as a result, we particularly stress the importance of grounding. Sometimes, there is
an anesthesia in the working machine, please check their grounding device firstly.
4.OVERVIEW OF MAIN COMPONENTS
