Cut Sheet

Volume 7—Logic Control, Operator Interface and Connectivity Solutions CA08100008E—June 2015 www.eaton.com V7-T1-209
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1.8
Pushbuttons and Indicating Lights
30.5 mm Heavy-Duty Watertight/Oiltight—10250T
Step 3: Cam Selection.
The cam you select
determines the operation of
all contact blocks mounted to
the operator. It is selected on
the basis that it provides the
simplest circuitry for the
desired “X-O” diagram. The
selection tables show all the
“X-O” combinations. For the
purpose of this example, the
applicable portion of those
tables is shown on this page.
Now to make the cam
selection, make a simple
worksheet such as:
It becomes immediately
obvious that cam 3 is the
better choice for two
reasons, (1) the series
combination can be avoided
making it simpler to wire, (2)
only two contacts are
required, which is less
expensive than the three
contacts required by cam 2.
Step 4: Contact Block
Selection.
Having selected the cam,
contact block selection is
simply a matter of gathering
the A position and B position
circuits into pairs which make
up the most convenient contact
block arrangement. If there is
an imbalance in the number of
circuits under A or B, then
single circuit blocks must be
selected for these leftover
circuits.
Back to the worksheet,
having selected cam 3 do
this:
Step 5: Selector Switch
Operator.
Lastly, you have to choose
from the many types of
operators—knob and lever
in various colors or keyed.
Also what combinations of
maintained and spring
return functions are
required. Selection of these
operators can be found on
Page V7-T1-212. For the
example in step 4 you may
want a three-position
maintained black knob,
cam 3—Catalog Number
10250T1323.
The Complete Switch:
10250T1323 with one
10250T2 or, for one
composite catalog number,
10250T21KB found on
Page V7-T1-207.
Diagrams
Circuits shown illustrate
connections to obtain a
selector switch circuit
combination and are shown
with their appropriate line
diagrams. Field wiring of
jumper connections required
as shown.
X = Closed circuit
O = Open circuit
Wiring of Jumper
Connections
Four-position selector
switches are limited to four
contact blocks.
Contact Blocks
For selection and number
of available contact blocks
per operator, see Pages
V7-T1-235 to V7-T1-238.
Cam 2 Cam 3
X O O
O O X
(A)NO-(B)NC
(B)NO
(A)NO
(B)NO
X O X
O O X
ANO
BNO
10250T2
Parallel Connection
Series Connection
Example Selection Table
Two-Position Selector Switch Contact Block Selection
Note
1
Wired in series.
No. “X-O” Pattern
Cam Code #2 Cam Code #3
Top A Bottom B Top A Bottom B
1XOO
NO NC NO
—
4 OOX—
NO
—
NO
No.
Desired Circuit and
Operator Position
Contact Blocks Required to
Accomplish Circuit Function
Top Plunger A Bottom Plunger B
1XO
NC
or
NC
2OX
NO
or
NO
a