Entek IRD 6652 DSP Protection Monitor
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6652 DSP
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6652 DSP Monitor
This manual introduces you to the Entek IRD 6652 DSP protection monitor. It is intended
for anyone who installs, tests, configures, or uses the 6652 DSP protection monitor. This
manual covers the 6652 DSP with the version 3.62 firmware.
Introduction
The Entek IRD 6600 Series protection monitors are part of a modular protection system for
critical machinery. Each monitor is a stand-alone unit, using a separate power supply, relays,
and wiring termination unit. The 6600 Series protection monitors meet the intent of, and in
many cases, exceed the API 670 standard for protection monitoring. Each monitor in the
6600 Series fulfills a different role in providing comprehensive machinery protection.
Monitor Description
The 6652 DSP protection monitor provides continuous monitoring of the input signal from
non-contact eddy current displacement probes. The 6652 DSP independently monitors the
overall value for each input channel. You can define both high pass and low pass filters to
limit the frequency bandwidth of the signal. In addition, the 6652 DSP continually compares
the band-limited overall value to the Alert and Danger alarm setpoints.
If you connect a tachometer input (1 pulse/rev), the 6652 DSP calculates the magnitude and
phase values for the first three orders. It also calculates an FFT spectrum sampled at over 16
times the machine speed, with a maximum frequency of 12.5 times the machine speed, up to
18000 RPM. The 6652 DSP can also output orbit data if there is a 1x tachometer signal. If
there is no tachometer input signal, the 6652 DSP calculates the FFT spectrum over a user-
defined bandwidth (up to 19 kHz), and cannot provide order-based information or orbit
data. The spectrum is in the same units as the display, but in peak signal detection.
The monitor buffers the last 30 minutes of values (1 per second) for each channel, as well as
the last calculated spectrum. In the event of a Danger alarm, or a “first out” danger alarm
message from another monitor, the 6652 DSP stores this data in a separate memory area. A
“first out alarm” is the first alarm in an interconnected series of monitors. This feature
allows later analysis of the data leading up to the event that caused the Danger alarm.
The 6652 DSP can perform a type of vector monitoring by comparing the current 1x
vibration vector to a reference vector. This allows you to set a vector alarm based on the
amplitude of the difference between the reference vector and the current vector. Vector
monitoring in the 6652 DSP is also called “eccentricity monitoring”. You can configure the
6652 DSP to use the second Danger alarm relays for vector alarms.
You can define up to seven bands based on the machine speed. Each band can have its own
alarm setpoint multiplier and alarm action. This allows you to use the multiplier to define
different alarm setpoints for each band. You can also inhibit the Danger alarm relays for any
band or bands.
