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MODEL 365A & E365A VIBRASWITCHES
must be acknowledged that such a definition of upper
vibration limits (alarm condition) on the machine may
not have adequately defined the upper tolerance limit
of the machine before major repairs or excessive
machine damage.
It does, however, define a limit
which, in our experience, has proven to be safe. As
the user becomes more adept in using the Vibraswitch
as a monitoring device, his experience may dictate a
higher setpoint, more in keeping with the experience
he has gained on the particular machine.
The Vibraswitch is adjusted by a simple three-step
procedure (ref. Figure 4-2).
a. Zero Vibration Level Measurement
With the equipment on which the Vibraswitch is
mounted not operating, back off the Setpoint adjusting
screw counterclockwise (CCW) two turns and press
the reset button.
Then turn the Setpoint adjusting
screw slowly clockwise (CW) until actuation occurs
(the armature assembly is against the latch magnet,
Figure 4-1).
This is the zero vibration point, or
actuating point, with the machine not operating.
mark should be made with a lead pencil or other
convenient means to permanently record this "zero"
vibration point. Subsequent measurements are made
relative to this point.
Actuation can be heard as an audible "click".
noisy surroundings it may be necessary to use an
ohmmeter or wire the Vibraswitch to the control
circuit to tell when actuation occurs.
b. Normal g-level Measurements
With the machine (equipment) operating, back off the
Setpoint adjusting screw one turn counterclockwise
(CCW) and press the reset button. If the Vibraswitch
will not reset, back off the Setpoint adjusting screw two
turns counterclockwise (CCW) etc.
Setpoint adjusting screw slowly clockwise (CW) until
actuation occurs. Mark this position with a lead pencil
or other convenient means. The difference between
the two actuating points in Steps "a" and "b" is
the normal g-level of the operating machine, in
scale divisions. One scale division is approximately
0.1 g; one full turn is approximately 1.0 g.
c. Final Setpoint Adjustment
If the "normal" g-level is less than 1.0 g above the zero
level,
rotate
the
counterclockwise (CCW) 0.5 g (five graduations) from
the point where actuation occurs in Step "b" above. If
the "normal" g-level is greater than 1.0 g refer to
Figure 4-3 for the proper Final Setpoint setting with
respect to the "normal g-level vibration point" obtained
in Step "b". See example in Figure 4-3.
NOTE
Again turn the
Setpoint
adjusting
TYPICAL PENCIL MARK
TO INDICATE ZERO
VIBRATION POINT
SETPOINT
ADJUSTING SCREW
DIRECTION OF INCREASED
(HIGHER VIBRATION) SET POINT
Each scale division is approximately 0.1 g.
Each full revolution is approximately 1 g.
A
In
screw
- 10 -
Figure 4-2
Setpoint Adjustment
909GF294G
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