THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)
THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)
6-8
6-8
8
8
6
6
5
5
4
4
2
2
1
1
14
14
13
13
9
9
12
12
10
10
Illustr
Illustration 6-8.
ation 6-8. DP
DP, DT Latching Relay
, DT Latching Relay
30mm Proximity Switches
30mm Proximity Switches
(Illustration 6-9)
(Illustration 6-9)
..
The
The
proxim
proximity switches employed
ity switches employed on
on T
Taylor equipment
aylor equipment
are state-of-
are state-of-the-art sw
the-art switching devi
itching devices.
ces. The red
The red
wire of the proximity switch powers the proximity
wire of the proximity switch powers the proximity
switch itself and also powers the red L.E.D. on the
switch itself and also powers the red L.E.D. on the
cable side of the proximi
cable side of the proximity swit
ty switch.
ch. The black wir
The black wire
e
is the ground side of the proximity switch while the
is the ground side of the proximity switch while the
white wire is the common post of the internal
white wire is the common post of the internal
switc
switch.
h. The blue wir
The blue wire is the normal cl
e is the normal closed post of
osed post of
the internal switch and the orange wire is the nor-
the internal switch and the orange wire is the nor-
mally open post of the internal switch.
mally open post of the internal switch.
The proximity switch will be energized when the
The proximity switch will be energized when the
proxim
proximity swi
ity switch senses its tar
tch senses its target.
get. Once this hap-
Once this hap-
pens, the red L.E.D. will illuminate and the internal
pens, the red L.E.D. will illuminate and the internal
switch will switch, closing the circuit of the white
switch will switch, closing the circuit of the white
and orange wir
and orange wires.
es. The whit
The white and orange wir
e and orange wires
es
will have continuity between them only as long as
will have continuity between them only as long as
the proximi
the proximity switc
ty switch senses its target
h senses its target.
. The maxi-
The maxi-
mum targeting distance is approximately 3/8”.
mum targeting distance is approximately 3/8”.
The most effective way to troubleshoot the prox-
The most effective way to troubleshoot the prox-
imity sw
imity switch is wit
itch is with an ohmmeter
h an ohmmeter.
. This can be
This can be
accomplished by disconnecting the weatherpack
accomplished by disconnecting the weatherpack
connector (located approximately 3 foot from the
connector (located approximately 3 foot from the
proximity switch), jumpering the red wires at each
proximity switch), jumpering the red wires at each
end and jumpering the black wires at each end.
end and jumpering the black wires at each end.
Target the proximity switch (the red L.E.D. should
Target the proximity switch (the red L.E.D. should
illuminate) and check the continuity of the white
illuminate) and check the continuity of the white
and orange wires located on the proximity switch
and orange wires located on the proximity switch
side of the w
side of the weatherpack.
eatherpack. The ohmmet
The ohmmeter should
er should
indi
indicat
cate a
e a readi
reading of 0
ng of 0 - 40 ohms.
- 40 ohms. Rem
Remove the
ove the
target from the proximity switch and with an ohm-
target from the proximity switch and with an ohm-
meter, check the continuity between the white and
meter, check the continuity between the white and
orange wir
orange wires.
es. The ohmmet
The ohmmeter should now
er should now read
read
infinity
infinity If these two checks ar
If these two checks are good, the proximity
e good, the proximity
switc
switch is good.
h is good. If one of these check
If one of these checks fails, t
s fails, the
he
proxim
proximity swi
ity switch is bad and must be repl
tch is bad and must be replaced.
aced. Do
Do
not rely on the red L.E.D. as a sole indicator that
not rely on the red L.E.D. as a sole indicator that
the internal sw
the internal switch did, in fac
itch did, in fact, close.
t, close. Always
Always
check the continuity between the white and
check the continuity between the white and
orange wires as described above.
orange wires as described above.
RED
RED
BLACK
BLACK
BLUE
BLUE
WHITE
WHITE
ORANGE
ORANGE
NC
NC
COM.
COM.
NO
NO
L.E.D.
L.E.D.
Illus
Illustration 6-9.
tration 6-9. Proxim
Proximity Switc
ity Switch
h
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