MODEL 365A & E365A
INSTRUCTION MANUAL
VIBRASWITCH
®
MALFUNCTION DETECTOR
909GF294
PAGE 1
1.
DESCRIPTION
1.1
GENERAL
The Model 365A & E365A
Vibraswitch
®
Malfunction Detector provides protection for large motors,
pumps, compressors and other rotating equipment. Failing bearings, bent shafts, broken blades over
speeding and other similar malfunctions cause increased imbalance or high frequency vibration that is
detectable by the Model 365A & E365A
Vibraswitch
®
. The
Vibraswitch
®
may be wired to actuate an
alarm or cause a shutdown before costly damage occurs. It is designed for maintenance-free service in
permanently mounted installations.
The
Vibraswitch
®
is an acceleration sensitive device that sensitive to the total acceleratory
shock/vibration that is present on the machine. Acceleration is a vibration characteristic of prime
importance in cases of failure on reciprocating or rotating machinery. Newton’s second law of motion
states that the force exerted on a body by its’ mass is multiplied by its’ acceleration (F=M*A). Thus the
destructive force acting on a bearing is directly dependent on the acceleration of the masses involved at
the shaft, which is supported by the bearings.
It should be noted that the measurements made by the
Vibraswitch
®
are the summation of all of the
individual accelerations acting on the machine, giving the maximum possible protection.
It can be supplied with, or without, a remote reset coil. The remote reset coil provides a means of
resetting the switch after a trip, or holding the switch in the “normal” condition during transient
conditions, such as machine startup. The
Vibraswitch
®
is also available with low power contacts for use
when interfacing with computer systems and PLC’s.
Up to a total of eight (8) Model 365A & E365A can be used in conjunction with the Robertshaw Model
563A
Vibraswitch
®
Monitor to provide startup and monitor delays for a single machine being
monitored.
