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MODEL 365A & E365A VIBRASWITCHES
5. Unused apertures shall be closed with suitable
blanking elements.
Section 3 - INSTALLATION
3.1 GENERAL
Examine
the
Vibraswitch
damages.
IMPORTANT: If for any reason it is
determined that the Vibraswitch should be returned to
the factory, please notify the nearest Robertshaw
sales representative prior to shipment.
Vibraswitch 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
SPECIFICATIONS).
The Model 365A and E365A Vibraswitches are
certified for use in hazardous areas as indicated in
SECTION 2 – SPECIFICATIONS. In locations where
moisture condensation within explosion-proof junction
boxes is a problem a two-watt resistor (space heater)
may be placed across terminals 6 and 7 inside the
Vibraswitch cover and wired to provide continuous
heat and circulation of air.
resistance values.)
3.2 MOUNTING
Figure 3-1 illustrates the methods of mounting on
various pieces of equipment. Figure 3-2 shows the
mounting dimensions and Figures 3-3 and 3-4 show
the external wiring for the Vibraswitch.
The vibration sensitive axis of the Vibraswitch is
perpendicular to its mounting base.
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 preferable location being in
line with the rotating shaft (ref. Figure 3-1). Do not
mount the Vibraswitch perpendicular to the ends of
rotating shafts unless the end play or end-thrust
measurement is desired. Normally, bent shafts 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 Vibraswitches on top (horizontal
position) of equipment the vibration range is as stated
for
possible
shipping
Each
(see
SECTION
2
(See Table 3-1 for
Therefore, the
in the SPECIFICATION SECTION.
the Vibraswitch is mounted on a side position (90°
from the horizontal), 1 g is subtracted from the
measurement range.
If a custom mounting bracket is used to mount the
Vibraswitch due to an irregular mounting surface, it
must be constructed of steel having sufficient
thickness and properly reinforced so that mechanical
resonances are not introduced; usually 1/2" (12.7 mm)
steel plate is satisfactory if the dimensions of the
bracket are minimal (ref. Figure 3-1). It is extremely
important that all four corners of the Vibraswitch, as
well as the mounting bracket, be rigidly secured to the
machine.
Exact location is not critical as the
adjustment procedure of 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 Vibraswitch.
used to measure existing vibration by holding or
clamping
it
against
determining the trip point as described under
"ADJUSTMENT" in this manual.
vibration exceed the range of the Vibraswitch, it is
recommended that consideration be given to a
Robertshaw Velocity-Acceleration Monitor Model 566.
When mounting on a hot surface, metal spacers may
be placed at all four mounting holes to elevate the
Vibraswitch to allow for additional air flow between the
hot surface and the Vibraswitch. Spacers should be
3/4" (19 mm) diameter minimum and 3/4" (19 mm)
high maximum.
3.3 SPACE HEATER
In some outdoor installations, it may be necessary to
install a space heater (resistor) to prevent moisture
condensation.
A small conventional carbon 2 watt
resistor should be installed across terminals 6 and 7 in
the Vibraswitch. Proper resistor values are shown in
Table 3-1.
Space Heater Resistance Values
VOLTAGE
(AC OR DC)
460
240
120
48
24
- 3 -
However, when
The Vibraswitch can be
the
running
machine
Should normal
Table 3-1
SPACE HEATER RESISTOR
(OHMS)
0.22 meg
56,000
12,000
2,200
620
909GF294G
and
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