2505 Vibration Sensor Interface Module

2505 Vibration Sensor Interface Module
Vibration Sensor Interface Module
2500 Series PLC System
Product Bulletin
The 2505 VSIM is capable of calculating
alarm levels and presenting the PLC with
status bits. PLC programming downloads
the appropriate setpoints and time delay
values for Alert and Danger levels. Trip
Multiply setpoints can also be specified per
channel, and an attenuation factor if Intrinsic
Safety barriers are being used. A serial port
output is available for interface to a PC
running special software for limited spectral
The 2505 VSIM also has a High Speed
Interface Bus on the front panel for optional
connection to the 2506 Vibration System
Analysis Module (VSAM). The VSAM takes
the raw ADC data from each VSIM and
performs an FFT which converts the timebased signal into the frequency domain. The
VSAM is capable of monitoring userspecified frequency bands which can be
correlated with the different sources of
vibration energy. This capability is highly
useful for Predictive Maintenance purposes.
The vibration signal from a machine is the
number one indicator of the machine’s health
and is a necessary component of an effective
Machine Protection strategy. The 2505
Vibration Sensor Interface Module (VSIM)
provides four channels of configurable
connection to vibration sensors. Each
vibration input can directly connect to an
accelerometer, velocity probe, or proximity
probe (using an external probe driver). The
tachometer input can read speed from a
number of sensing circuits, including a
magnetic pickup on a toothed gear. Each
input is buffered internally and available for
connection to external analyzing equipment
through front panel connectors. The VSIM
calculates the RMS and true peak-to-peak
value along with the speed of the overall
vibration on each channel and presents
these values to the controller via the I/O
• Four configurable channels interface to
any vibration sensor (accelerometer,
velocity, or proximity) plus a tachometer
• Buffered BNC outputs for external analysis equipment
• Overall RMS and True peak-to-peak
vibration levels computed with high-speed
• Alert and Danger alarm levels with PLC
specified setpoints, time delays, Trip
Multiply, and IS barrier attenuation factors
• DC voltage sensing circuitry for Bias Hi/Lo
(accelerometers) or Gap Over/Under
(proximity probes) alarming
• LED indication of configuration, probe
circuit faults, Alert and Danger alarm
• High Speed Interface Bus for optional
connection to 2506 VSAM for FFT
conversion and spectral monitoring/
• Hardware integration option
Control Technology Inc.
5734 Middlebrook Pike, Knoxville, TN 37921-5962
Phone: 865/584-0440
Fax: 865/584-5720 www.controltechnology.com
Channel options:
Accelerometer (+24V @ 5mA), velocity probe, or proximity probe (+24V bias to external probe driver circuit)
Gain (determined by probe sensitivity and expected signal levels): 1, 1.25, 2.5, 5, 10, 25
Optional hardware integration - enables accelerometer to report velocity or velocity to report displacement
High-pass filter values: 1Hz, 2Hz, 5Hz, 10Hz, 20Hz, 50Hz, 100Hz
Reporting Mode (raw mV or engineering units): RMS, computed Peak, computed P-P
Units of Measurement (English or Metric) and Scale Factor (Input and Output)
Probe Sensitivity (value specified by manufacturer); 5V peak max input spec.
Trip Multiply value: 1.5, 2.0, 2.5, 3.0
Intrinsic Safety barrier attenuation factor in percent
Alert and Danger setpoints (specified in engineering units) and Time Delays (sec x 10)
Alarms calculated on either RMS value or True peak-to-peak
Gap Over/Bias High, and Gap Under/Bias Low alarm setpoints
Gap Voltage (voltage x 100) and Gap Distance: specify the response of a proximity transducer
Tachometer channel:
Input Mode (Open Collector or Differential) and Input Signal Type (negative pulse, positive pulse, or
Module Options (applied to all channels):
Write Protect switch: when set, allows only one download of configuration parameters per channel
fmax (sets low pass filter):
1.5 Hz
Number of Samples: correlates with fmax to determine Time to Sample before computing RMS value
(8192, 4096, 2048, 1024, 512, 256, 128, 64, 32, 16, 8, 4)
Number of Teeth on speed gear:
0 = report speed in Hz to PLC
1 = tach input yields one pulse per revolution (allows phase correlation by model 2506 VSAM)
2-255 = number of teeth on gear (Tach data in either Hz or RPM)
Module Status:
Off until Self-Diagnostics pass
Solid Green on Successful completion
Channel Status:
Off if channel not configured or configuration bad
Solid Green when channel configured and operation within limits
Flashing Green when Alert Setpoint AND Time Delay exceeded
Flashing Red when Danger Setpoint AND Time Delay exceeded
Solid Red if Probe Circuit Fault
Tachometer: Green in relation to speed of input signal (may flash at low speeds)
PLC reporting:
Overall RMS vibration level
Peak-to-Peak value
DC bias voltage of probe circuit
Speed (in RPM or Hz)
Probe Circuit Fault status bit
Alarm/Danger status bits (if set in module)
Module status word
Copyright© 2006 Control Technology Inc.
All Rights Reserved
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