Английский язык. Арланова Т.Л - 41 стр.

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41
used. If the water temperature is too low, the control unit will switch on the
heater. The temperature sensor continues to check the temperature and keep
the control unit informed. Once the correct temperature is reached, the
control unit switches off the heater and moves on to the next stage of the
program.
Text 4
Clock
The control unit includes a memory which tells it how long each stage of a
program should last. The times may be different for each program. The
electronic clock built into the control unit keeps the memory of the control unit
informed so that each stage of each program is timed correctly.
Text5
Drum speed
During the washing and spinning cycles of the program, the drum has to spin
at various speeds. Most machines use three different speeds: 53 rpm for
washing; 83 rpm for distributing the load before spinning; 100 rpm for
spinning.
The control unit signals the motor to produce these speeds. The motor starts
up slowly, then gradually increases speed. The speed sensor, a
tachogenerator, keeps the control unit informed as to the speed that has
been reached. The control unit uses the information to control the power to
the motor and so controls the speed of the drum at all times.
Exercise 6. Language study If/Unless sentences
Fill in the blanks in this table using the information in Fig. 3 and the texts .
Sensor Condition Control unit action
Water Level low
Level high
enough
Open inlet valves
________________
Water
temperature
High enough
Switch on heater
______________
Drum speed _____________
____
Decrease motor
speed
The conditions which the sensors report determine the action of the control
unit. We can link each condition and action like this:
If the water level is low, the inlet valves are opened.
Exercise 7. Write similar sentences for the other five conditions given.
Now study this example:

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