C.
Electromagnetic
Control
1.
Genera)
InformaHon
a. Brief Description
Lifting the work clomp or starting the machine previously required a con
siderable
amount
of
energy
on the port of the
operator
in an
overage
working
cloy,
To reduce the physical strain and, at the same time, increase
the output, electromognetic control has now been introduced. On a
PfafF
3334
fitted with an X35 or X45 device, all the
operator
has to do to start the machine
is to tip on a push button (FS in Fig. 4), which is provided with two switch posi
tions. Actual work is then performed by solenoids HM
and
EM.
While the
former
serves
lo raise
and
lower
the
work
clomp,
the
latter
starts
the
machine.
Since both solenoids
operate
on D. C., but the current locally available
is either single or
three-phase
A. C., a rectifier (GL in Fig. 72) has
been
placed
in the circuit.
When
motor
M is switched on,
current
is simultoneously sup
plied lo the rectifier which instantly raises the work clomp.
Fig. 72
78
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