s
|
1.
|
holding contacts
|
a. indicator of operation status
|
x
|
2.
|
momentary contact
|
b. continues 3 hours or more
|
z
|
3.
|
dependent operation
|
c. a motor can run briefly
|
v
|
4.
|
normally open (not i)
|
d. protect motor from damage
|
l
|
5.
|
two wire control
|
e. metal bar prevents simultaneous operation
|
n
|
6.
|
sequence operation
|
f. any motor can run anytime
|
b
|
7.
|
continuous load
|
g. relay not used to control motor
|
w
|
8.
|
control voltage
|
h. uses magnetism to operate switch
|
c
|
9.
|
jog mode
|
i. normally open
|
t
|
10.
|
OR operation
|
j. motor continues until stop pressed
|
f
|
11.
|
independent operation
|
k. usually powers control components
|
a
|
12.
|
pilot light
|
l. thermostat
|
h
|
13.
|
relay
|
m. has holding contacts
|
o
|
14.
|
electrical interlock
|
n. first A then B then C
|
q
|
15.
|
normally closed (not u)
|
o. set of opposite relay contacts in series
|
u
|
16.
|
stop pushbutton
|
p. has same line control voltage
|
j
|
17.
|
run mode
|
q. a path for current flow
|
y
|
18.
|
inch operation
|
r. usually powers loads
|
e
|
19.
|
mechanical interlock
|
s. allow motor to run without operator
|
i
|
20.
|
start pushbutton
|
t. A can run. If not then B can run
|
g
|
21.
|
control relay
|
u. normally closed
|
m
|
22.
|
three wire control
|
v. no path for current flow
|
k
|
23.
|
low voltage
|
w. need not match load
|
r
|
24.
|
line voltage
|
x. brief change in conductivity
|
d
|
25.
|
overloads
|
y. slight movement
|
|
|
|
z. if A is run, the B can run
|
