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Entek IRD 6652 DSP Protection Monitor
Monitor Description
The 6652 DSP can also collect and store up to 300 sets of order data (magnitude and phase
for 1x, 2x, and 3x) for transient analysis in a user-defined RPM range. The monitor allows
you to define the number of steps, which also defines the RPM interval between the data
sets. You can retrieve any of this data from the monitor using the MODBUS protocol
through a 4-wire multi-drop serial interface.
Caution: Do not connect the monitors to the transducers until you are sure of the power
connections. Transducers could be damaged if the transducer supply is not correct.
Table of Abbreviations
The following table lists the abbreviations used in this manual.
Application
The 6652 DSP is appropriate for monitoring vibration on rotating machinery in a variety of
configurations. This includes monitoring vibration on shafts with oil-lubricated journal
bearings. This is particularly appropriate when the rotor mass is small relative to the mass of
the machine casing. It is also appropriate where the stiffness of the machine mounting is
such that a light-weight rotor does not provide sufficient energy to generate significant
pedestal vibration.
Casing or bearing mounted non-contact eddy current displacement probes are preferred for
this application. They provide a signal analogous to the relative movement between the
probe tip and the target shaft. This gives the relative movement between the casing and the
shaft. Vibration signals are usually measured as a peak to peak value, and expressed in units
of micrometers, millimeters, or mils (1 mil = 0.001 inch).
Abbreviation
Definition
eu
current engineering unit for the monitor
g
g (acceleration)
Hz
Hertz (frequency)
in, ins
inch, inches
mA
milliamp
mil
thousandth of an inch
mm
millimeter
mV
millivolt
pk
peak (signal detection)
pp
peak to peak (signal detection)
rms
root mean square (signal detection)
RPM
revolutions per minute (frequency)
µm
micrometer
V
Volt
VAC
Volt AC
VDC
Volt DC
