CTI 2505 Vibration Sensor Interface Module

2505 Vibration Sensor Interface Module

The 2505 Vibration Sensor Interface Module provides four vibration inputs to the 2500 Series® I/O base.

The module is configurable to interface to accelerometers, velocity probes, or proximity probes plus a tachometer input.

The module calculates the RMS and true peak value of the overall vibration on each channel and presents this value to the controller via the I/O backplane.

Features

Four channels to interface to any vibration sensor plus a tachometer input

buffered BNC outputs for external analysis equipment

Overall RMS and true peak vibration levels computed with high speed ADC

Alert and Danger alarm levels with PLC-specified setpoints

Time delays and Trip Multipliers

Description

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 ta- chometer 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

backplane. The 2505 VSIM is capable of calculating alarm

levels and presenting the PLC with status bits. PLC

programming down- loads 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

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 time

based signal into the frequency domain. The VSAM is capable

of monitoring user-specified frequency bands which can be

correlated with the different sources of vibration energy. This

capability is highly useful for Predictive Maintenance purposes.

Control Technology Inc.

5734 Middlebrook Pike, Knoxville, TN 37921-5962

Phone: +1.865.584.0440    Fax: +1.865.584.5720

www.controltechnology.com

• LED indication of configuration, probe circuit

faults, Alert and Danger alarm status

• High Speed Interface Bus for optional connection

to 2506 VSAM for FFT conver- sion and spectral

monitoring/analysis

• Hardware integrationoption

Specifications:

Channel options:

• Accelerometer (+24V @ 5mA), velocity probe,

or proximity probe (+24V bias to external probe

driver circuit)

• Gain (determined by probe sensitivity and ex

pected signal levels): 1. 1.25. 2.5. 5. 10. 25

• Optional hardware integration - enables accel

erometer 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 Fac

tor (Input and Output)

• Probe Sensitivity (value specified by manufac

turer); 5V peak max input spec. Trip Multiply

value: 1.5. 2.0. 2.5. 3.0

• Intrinsic Safety barrier attenuation factor in per

cent

• Alert and Danger setpoints (specified in engi

neering 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 bipolar)