· The air brake can be set or released.
· The air clutch can be engaged or disengaged
The automatic control timer (fig. 5-52) is the
· The proper drive motor can be energized or
function control system for the washer-extractor.
Command and control signals are routed by finger
contacts and/or switches in the control timer to sequence
· The chart motor can advance the formula chart
functions and cycles within an operation during formula
or manual mode.
· The washer balance system can operate.
FORMULA MODE.-- A programmed formula
· The washer door can be opened.
chart (fig. 5-53) is mounted on the rotating drum/copper
screen inside the control timer. During the formula
mode, the drum rotates and finger contacts press against
command circuit generates command signals through
the chart. As a finger contact passes over a slot in the
the action of finger contacts and/or toggle switches. The
chart, it touches the copper screen. This completes an
command signals are routed throughout the washer to
electrical circuit and generates a command signal. Each
finger contact controls a different command signal. The
and solenoid valves sequence and control the duration
chart can control the wash operation by programming
of functions and/or cycles during a wash operation.
the time and duration of finger contact on the screen.
Figure 5-52.--A typical automatic control timer.