S
E
N
S
O
R
S
A
Disconnect all electrical power to the machine.
N
D
IN
S
T
R
U
M
E
N
T
A
T
IO
N
F
O
R
M
A
C
H
IN
E
C
O
N
D
IT
IO
N
M
O
N
IT
O
R
IN
G
Make sure the machine cannot operate during installation.
Follow all safety warnings of the machine manufacturer.
Read and follow all installation instructions.
The 685AX8 Series vibration switches are sensitive to shock and vibration in all three planes of motion - up/down,
front/back and side/side. Side/side (in the same plane as the reset pushbutton) is the most sensitive. For
maximum sensitivity mount the unit so that the side with the reset button is in-line with the direction of rotation of
the machine. (See Dimension Drawing on page 5 for sensitivity adjustment location.)
The 685AX8 must be firmly attached/mounted to the machine so that all mounting surfaces are in rigid contact
with the mounting surface of the machine. For best results, mount the instrument in-line with the direction of
rotating shafts and/or near bearings. In other words, the reset push button should be mounted pointing into the
direction of shaft rotation (see page 7). It may be necessary to provide a mounting plate or bracket to attach the
685AX8 to the machine. The mounting bracket should be thick enough to prevent induced acceleration/vibration
upon the 685AX8. Typically 1/2 in. (13mm) thick plate is sufficient. See illustrations on page 7 for typical mounting
locations.
CAUTION:
A dust boot is provided on the reset pushbutton for all series to prevent moisture or dust intrusion.
The sensitivity adjustment for model 685AX8 is not sealed; therefore, mounting orientation should be on a
horizontal plane or with the sensitivity adjustment pointing down.
WARNING: STOP THE MACHINE AND DISCONNECT ALL ELECTRICAL POWER BEFORE BEGINNING
INSTALLATION.
1) Firmly secure the unit to the equipment using the base foot mount.
For oil well pump jacks, attach the 685AX8 to the Sampson post or walking beam. See Typical Mounting
Locations page 7.
2) Make the necessary electrical connections to the vibration switch. See Internal Switches, page 8 for electrical
terminal locations and page 9 & 10 for typical wiring diagrams.
DO NOT EXCEED VOLTAGE OR CURRENT
RATINGS OF THE CONTACTS.
Follow appropriate electrical codes/methods when making electrical
connections. Be sure that the run of electrical cable is secured to the machine and is well insulated from
electrical shorting. Use of conduit is recommended.
NOTE: If the electrical cable crosses a pivot point such as at the pivot of the walking beam, be sure to
allow enough slack in the cable so that no stress is placed on the cable when the beam moves.
If conduit is not used for the entire length of wiring, conduit should be used from the electrical supply box to a
height above ground level that prevents damage to the exposed cable from the elements, rodents, etc. or as
otherwise required by applicable electrical codes. If conduit is not attached directly to the 685AX8 switch, use a
strain relief bushing and a weatherproof cap on the exposed end of the conduit. A “drip loop” should be provided
in the cable to prevent moisture from draining down the cable into the conduit should the weatherproof cap fail.
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