Robertshaw 365A Instruction Manual Download

Page: 9 / 20

MODEL 365A & E365A

INSTRUCTION MANUAL

VIBRASWITCH

MALFUNCTION DETECTOR

909GF294

PAGE 5

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

UL Certified for use in hazardous locations as indicated in

section

2 -- SPECIFICATIONS

. The Model E365A

Vibraswitch

is UL,

UL and ATEX Certified for

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