7
m o t o r
d r iv e
(corrf
.)
The rotary switch may be positioned
eith er by hand or by the motor d riv e .
A DC motor turns the rotary switch
through a frictio n d riv e . The
rotary switch connections are
made seq u en tially whether the pointer
is turned by hand or driven by the motor.
The rotary switch motor is an
e le c tric a l component w hich
requires two connections just like
a light or re la y . Current must
flow through the motor to make it
run and turn the rotary sw itch . The
c irc u it drawing of the motor
looks like the above.
Term inals 17, 18 and 19 are located on the
panel just to the left of the pointer knob
and rotary switch term inals. Power must be
supplied to term inals 17 and 18 (run) to operate
the motor d riv e . A short c irc u it may be
connected across term inals 18 and 19 (stop)
to halt the motor d riv e .
R ESISTO R S
The e le c tric a l resistors used w ith the
motor drive lim it the current w hich
flows through the c irc u it in the same
w ay that the lights lim it the amount of
current w hich flows through a relay c o il.
The resistors make it possible to connect a
short c irc u it across the STO P term inals to stop
the motor without over-loading the power supply.
DECIMAL INPUT-OUTPUT
The motor driven rotary sw itch is ca lle d
a Decimal Input-O utput because it has
positions w hich are designated by ordinary
decimal numbers. "Inpu t-O utp ut" means
that the rotary switch may be used by the
operator to m anually d e liv e r information to
the computer or that the computer may
au to m a tically d e liv e r information to the
operator. The Decimal Input-O utput is thus
used by the operator to communicate w ith
the computer using decim al numbers.
The follow ing experiments demonstrate the
rotary switch and motor d rive operation.
22
Summary of Contents for Minivac 601
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