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MODEL 365A & E365A
VIBRASWITCH® MALFUNCTION DETECTOR
3 INSTALLATION
3.1
GENERAL
Examine the Vibraswitch® for possible shipping damages. IMPORTANT: If for any reason it is
determined that the equipment should be returned to the factory, please notify the nearest Robertshaw
Sales representative prior to shipment. Each unit must be properly packaged to prevent damage.
Robertshaw assumes no responsibility for equipment damaged in shipment due to improper packaging.
Choose the location in accordance with good instrument practice, avoiding extremes of temperature,
humidity and vibration. (See SECTION 2 – SPECIFICATIONS)
The Model 365A Vibraswitch® is UL, and
section 2 -- SPECIFICATIONS. The Model E365A Vibraswitch® is UL,
use in hazardous locations as indicated in section 2 -- SPECIFICATIONS.
In locations where moisture condensation within explosion proof junction boxes is a problem, a 2-watt
resistor may be placed across terminals 6 and 7 inside the Vibraswitch® and wired to provide continuous
heating and air circulation. (See Table 3-1 for resistance values.)
3.2
MOUNTING
Figure 3-2 illustrates the methods of mounting on various pieces of equipment. Figure 3-1 shows the
mounting dimensions and external wiring for the Vibraswitch®, Model 365A.
The vibration sensitive axis of the Vibraswitch® is perpendicular to its mounting base. Therefore, the
Vibraswitch® must be mounted on a plane that will detect the vibratory motion for which protection is
desired. The Vibraswitch® may be mounted at any location along the length of machines containing
rotating shafts that are horizontal and parallel to the base of the machine: the preferred location being in
line with the rotating shaft (ref Figure 3-3). Do not mount the Vibraswitch® perpendicular to the ends of
rotating shafts unless the endplay or end-thrust measurement is desired. Normally, bent shafts,
unbalances on the rotating mass of the shaft, worn bearings, and other anomalies are detected near the
bearing housings and at right angles to the shaft.
The Vibraswitch® may be mounted in any position between the side (vertical) or the top (horizontal) of
bearings or machine housings. It should be noted that when mounting the Vibraswitch® on top
(horizontal position) of equipment, the vibration measurement range is as stated in the SPECIFICATION
SECTION. However, when the Vibraswitch® is mounted on a side position (90° from the horizontal), 1
g is subtracted from the measurement range.
If a mounting bracket assembly is used to mount the Vibraswitch® due to irregular mounting surface, it
must be constructed of steel having sufficient thickness and properly reinforced so that mechanical
resonance's are not introduced; usually ½" steel plate is satisfactory if the dimensions of the bracket are
minimal (ref Figure 3-3). It is extremely important that all four corners of the Vibraswitch® as well as
the mounting assembly be rigidly secured to the machine. Exact location is not as critical as the
adjustment procedure of the Vibraswitch®. The Vibraswitch® automatically accounts for the normal
vibration at that location.
The Vibraswitch®, when properly adjusted, trips on a relative increase in vibration.
When installing the Vibraswitch®on existing equipment where several convenient mounting positions
are available, it is advisable to check the existing vibration level at each possible position before
permanently mounting the unit. The Vibraswitch® can be used to measure existing vibration by holding
UL Certified for use in hazardous locations as indicated in
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PAGE 5
INSTRUCTION MANUAL
909GF294
UL and ATEX Certified for
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