Robertshaw 365A Instruction Manual page 17

MODEL 365A & E365A
VIBRASWITCH® MALFUNCTION DETECTOR
The Model 365A & E365A Vibraswitch® is adjusted by a simple three-step procedure (Ref., Figure 4-
2).
1. Zero Vibration Level Measurement
With the equipment on which the Vibraswitch® is mounted not operating, back off the
SETPOINT adjustment screw counterclockwise (CCW) two (2) turns and press the
RESET button. Then turn the SETPOINT adjustment screw slowly clockwise 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. A mark
should be made with a pencil or other convenient means to permanently record this
"zero" vibration point. Subsequent measurements are made relative to this point.
2. Normal g-Level Measurements
With the machine (equipment) operating, back off the Setpoint adjusting screw one turn
CCW and reset. If it will not reset, back off the Setpoint adjusting screw two turns CCW.
Again turn the Setpoint adjusting screw slowly clockwise until actuation occurs. Mark
this position with a pencil or other convenient means. The difference between the two
actuating points in Steps 1 and 2 is the normal g-level of the operating machine, in
scale divisions. One scale division is ~0.1 g; one full revolution is ~1.0 g.
3. Final Setpoint Adjustment
If the "normal" g-level is less than 1.0 g above the zero level, rotate the Setpoint
adjusting screw CCW ~0.5 g (five graduations) from the point where actuation occurs in
Step 2 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 2.
In preceding adjustments, actuation can be heard
as an audible click. In very noisy surroundings, it
may be necessary to use an ohmmeter or wire the
Vibraswitch to the control circuit to tell when
actuation occurs.
NOTE
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INSTRUCTION MANUAL
909GF294