IOM
TopWorx engineers are happy to provide technical assistance on GO
™
Switch products. However, it is the
customer's responsibility to determine the safety and suitability of the product in their application. It is also the
customer's responsibility to install the switch using the current electrical codes in their region.
80 Series
The GO
™
Switch Proximity
Principle
Single-magnet 80 Series GO Switches
are designed for use with two inde-
pendent circuits. A ferrous armature is
positioned off-center, creating domi-
nance and placing the contacts for
both circuits in a Normally Closed
(N/C) position (Figure 1).
When a ferrous actuator enters the
sensing area of the switch (Figure 2),
it deflects magnetic flux from the
N/C side of the armature and the
Normally Open (N/O) side becomes
dominant. The armature then snaps to
its alternate position, closing the N/O
contacts. When the actuator is
removed, the magnet again becomes
dominant on the N/C side and the
armature returns to its N/C position.
SPECIFICATIONS - DPDT
Contacts:
Double Pole, Double Throw,
2 Form C., Silver cadmium oxide, gold
flashed
Rating:
1250 watts @ 120, 240, 480
or 600 VAC. Maximum cycle rate of 10
cycles per minute resistive load at 10
amps.
Housing:
Environmentally sealed
brass or stainless steel
Conduit Outlet:
1/2" -14NPT
Repeatability:
0.002" (0.05mm) typical
Sensing Distance:
Approx.
1/4" (7mm) end sensing. (NOTE:
Sensing distance may be affected by
surrounding ferrous materials and
actuator size)
Differential:
Approx. 1/4" (72mm)
Response time:
8 milliseconds
Temperature Rating:
-40
o
F.
(-40
o
C) to 221
o
F (105
o
C)
Mounting
■
Determine the desired operating
point.
■
Locate switch and/or actuator to
assure that actuator comes well
within switch’s sensing area.
■
Use a ferrous actuator of sufficient
size.
■
Recommended sensing is one half
the published sensing range for
trouble free operation with a repeata-
ble target. If target sensing area
needed is greater, there are multiple
target magnets available from Top-
Worx to extend the range of the
switch.
■
Avoid contact between switch and
actuator, which may damage switch.
■
For best results, mount switch on
non-ferrous materials.
■
Steel placed outside the switch’s
differential area will not affect
functionality.
■
We do not recommend that GO
Switches be mounted to ferrous
metal. If a ferrous mount is the only
option consult factory. The switch
must be centered on the bracket to
avoid latching and the maximum
sensing distance will be reduced by
approximately 50%. A target magnet
is highly suggested in that case.
■
Ferrous brackets or surrounding
ferrous metal should NOT be applied
to the top of the switch above the
sensing area...Latching may occur.
■
Switch must be centered on ferrous
mounting bracket so that effects on
the magnet are uniform.
Attachment of
Conduit or Cable
Attach conduit or cable correctly.
–
When using long runs of conduit or
cable, place supports close to the
switch to avoid pulling switch out
of position.
–
If switch is mounted on a moving
part, be sure flexible conduit is long
enough to allow for movement, and
positioned to eliminate binding
or pulling.
–
For installation in hazardous
locations, check local electrical
codes.
–
All conduit connected electrical
devices, including GO Switches,
must be sealed against water
ingression through the conduit
system. In figure 1, something
common has occurred, the conduit
system has filled with water. Over
a period of time this may cause
the switch to fail prematurely. In
figure 2, the termination of the
switch has been carefully filled
with electronics grade RTV to
prevent water ingression and to
prevent premature switch failure.
A drip loop with provision for water
to escape has also been installed.
All GO Switches are "pure" contact
switches, meaning they have no
voltage drop when closed, nor do they
have any leakage current when open.
For multi-unit installation, switches
may be wired in series or parallel, as
shown.
Series Wiring
Any number of GO Switches may be
wired in series, without voltage drop.
By contrast, solid state switches have
about two volts drop across the switch
when operated. In a 12 volt solid state
system with four switches in series, 8
volts is dropped across the switches.
Only 4V is left to operate the load.
When using GO Switches, 12V is
still available to operate the load.
(Except 7L - approx. 5V drop)
Parallel Wiring
When solid state switches are placed in
parallel, there is about 100 microamps
leakage through each switch. If ten solid
state switches were wired in parallel, the
total leakage current would be 1000
microamps or one milliamp - sufficient
current to indicate an "ON" condition to
a programmable logic controller (PLC).
Any number of GO® Switches may
be wired in parallel, with no current
leakage and without drawing
operating current.
(Except 7L - approx.
5V drop)
NOTE:
Occasionally the 80 Series DPDT
is used for its end sensing, when only a
SPDT switch is required. If this is the
case in your application it is to your best
advantage to parallel the lead wires (red
to red/white stripe, blue to blue/white
stripe and black to black/white stripe,
essentially converting a DPDT switch to a
SPDT configuration) so that both individ-
ual circuits see the same load and there-
fore wear equally to give long contact life
and the reliable service you expect with
GO® Switch.
Dual Form C
DPDT
Activated
Unactivated
Target
Sensing Area
Armature
Standard GO Switch
Actuators
The part to be sensed can approach
or pass across the sensing area from
any direction. This permits unlimited
over-travel and a wide variety of
operating conditions.
CAUTION:
To assure optimum switch
operation, the actuator speed should
exceed 2 FPS (feet per second).
Switch Sensing
Target should be either ferrous metal
the size of the sensing face and 1/4"
thick or a TopWorx Target Magnet.
Maximum sensing with the recom-
mended ferrous target is 5/16" .
TopWorx recommends that the target
be set at 50% of that distance if
possible, to compensate for actuator
wear and repeatability over time.
Target magnets are available from
TopWorx to extend the sensing range
of the switch.
NOTE:
Actuator size effects sensing
distance.
SENSING
AREA
1.5"
38mm
1.5"
38mm
.206" DIA
MTG HOLES
1/2"-14 NPT
Conduit outlet
.875"
22mm
.31"
8mm
3.12"
79mm
4.88"
124mm
1.5"
38mm
1.5"
38mm
SENSING
AREA
.875"
22mm
3.12"
79mm
.206" DIA
MTG HOLES
.31"
8mm
4.31"
109mm
.
45"
12mm
1/2"-14 NPT
Conduit outlet
1" SQ hub
3.66"
93mm
Contact Chamber is potted to resist contami-
nants. Please see notes on conduit installation.
Optional connectors available for excessive
moisture and submersed conditions
Rugged Brass
or Stainless
Steel housing
Multiple termination options:
Lead wires, Cable, Quick
Disconnects
EC Declaration of Conformity
The products described herein, conform to the
provisions of the following European Community
Directives, including the latest amendments:
Low Voltage Directive (2006/95/EC)
EMC Directive (2004/108/EC)
Machinery Directive (2006/42/EC)
ATEX Directive (94/9/EC).
TM
