The Robertshaw Model 563A Vibraswitch
Electronic Vibration Monitor is a microprocessor based supervisory control system
designed for use with Robertshaw Model 365 or 366 Vibraswitch Vibration
Switch. It may be used with one to eight Vibraswitches and has been
programmed to provide a means of differentiating between valid excessive
vibration and excessive vibration resulting from temporary external
disturbances.
Many machines, during their normal operation, will
suffer occasional short-duration transient shocks, which are external to
the monitored machine. Examples of these disturbances are: Closing of
pipeline check valves on pumping applications; Start-up of additional
pumps on a line; nearby machinery operating - such as hydraulic presses,
etc.. These disturbances may cause a Vibraswitch to "trip out" if the
vibratory level is in excess of its set-point. The Model 563A provides
field settable Monitor Time Delay circuitry that eliminates equipment
shutdown because of these transients and ensures that only a continuous
vibration level which exceeds the set-point of the
Vibraswitch will initiate an alarm and/or shutdown. This Monitor Time
Delay is adjustable, using digital rotary switches, over a range of 0 to
99 seconds.
Nearly all rotating machinery, during its "start-up"
operation, will go through an excessive vibration point which is inherent
to the machine. This vibration level sometimes is higher than the
alarm/shutdown level desired for safe protection. The Model 563A contains
circuitry which provides a Starting Time Delay to disable the Vibraswitches for a period of time to allow the machine to
reach its normal operating speed or condition. After this delay period,
the Model 563A activates the Vibraswitches to provide the necessary
vibration protection. The Start Time Delay is adjustable over a range of 0
to 999 seconds by means of digital rotary switches.
Eight LED indicators, viewable through the window on the
instrument door, are provided for visual indication to determine which
Vibraswitch detected the excessive vibration and triggered the alarm
and/or shutdown.
