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Summary of Contents for STI CMCP810 Series
- Page 1 REV A.1 CMCP810 SERIES RUNOUT KIT WITH SENSOR INTERFACE MODULE INSTRUCTION MANUAL STI VIBRATION MONITORING INC WWW.STIWEB.COM...
- Page 2 Optical Phase Reference Sensor Roll Reflective Tape Two Magnetic Flexible Arm Sensor Holders Two BNC to BNC Cables Banana to BNC Adapter Clipboard with Manuals and Optional Software The Basics of an Eddy Current Probe Signal An Eddy Current Probe is a non‐contact sensor capable of the measuring the position of a ferrous material with high resolution. The output of the probe can be viewed as a waveform showing the motion towards and away from the probe. In order to display a positive and negative going signal in electronics an offset voltage must be provided to allow the voltage signal to swing up and down. To do this the eddy probe driver creates a DC offset voltage for the AC voltage signal to ride on. The DC voltage is referred to as the “gap” voltage and is typically set to ‐12VDC. Since most modern oscilloscopes only allow for up to a 5VDC offset a bucking circuit must be used to move the ‐12VDC offset to within the oscilloscopes measurement range. About the Sensor Interface Module (CMCP810‐SIM) The CMCP810SIM Sensor Interface Module provides a single access point for the sensors and oscilloscope, eliminating the need of dual power supplies and a mix of wiring in between. An internal lithium‐ion battery provides ‐24VDC for the Proximity Probe and +15VDC for the Phase sensor. The battery can be recharged using the charger provided with the CMCP810SIM module. Spare batteries may also be purchased. The main purpose of the Sensor Interface Module is the bucking amplifier capabilities. The CMCP810SIM can remove the entire DC offset so that only the AC signal is viewable on the oscilloscope. CMCP810‐SIM Front Panel Connections The front of the CMCP810SIM module features a On/Off switch with an LED On indicator, Voltage Adjust knob and two BNC connectors for the signal outputs. Once the sensors and oscilloscope are connected, the Voltage Adjust knob can be set so that the Proximity Probes signal is within the oscilloscopes viewing range. www.stiweb.com STI Vibration Monitoring Inc. Published July 2013 League City, Texas USA Page: 1 ...
- Page 3 About the Sensors Proximity Probe: The supplied Proximity Probe is the same type of sensor normally permanently installed to measure vibration. This model sensor provides a 200mV output per mil (0.001”) of electrical runout on a 4140 series shaft. An Proximity Probe is made up of three specifically tuned components, the probe, extension cable and driver, all three must be connected together in order for it to operate; unlike many instruments this sensor is ‐24VDC powered and powered is supplied by the CMCP810‐SIM Sensor Interface Module. To learn more about how Eddy Probes operate see our application note on Radial Vibration in the Knowledge Base section on our website. www.stiweb.com STI Vibration Monitoring Inc. Published July 2013 League City, Texas USA Page: 2 ...
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Page 4: Sensor Mounting Options
Sensor Placement Proximity Probe (Runout): The Proximity Probe should be installed in one of the supplied holders and positioned above the burnished area of the shaft as specified in the shop drawings. The probe requires a gap between the shaft and the probe tip in order for it to operate correctly. The gap can be set by measuring the DC voltage output from the driver, position the sensor until the output from the driver reads approximately ‐12VDC using the voltmeter function on the oscilloscope, this gap voltage corresponds to about 60 mils on 4140 series steel. To measure the gap voltage with the ScopeMeter simply disconnect the Channel A BNC Cable, attach the Banana to BNC Adapter and plug into the voltage input connectors. Take note of the polarity when using the adapter, the common lug has a flag on the post showing “GND”. After gapping the probe be sure to move the BNC cable back to the Channel A input. During runout measurements the Proximity Probe should be set to Channel 1, also known as Channel A, which is displayed on Trace A. Optical Sensor (Phase): The optical sensor should be installed in one of the supplied holders and positioned near the Proximity Probe. A 1” piece of the supplied reflective tape needs to be placed on the shaft below the sensor. The gap between the optical sensor and the reflective tape can be up to 6”. To verify that the sensor is sensing the reflective tape rotate the shaft and visually inspect that the green light on the back of the optical sensor flickers once per revolution. During the runout measurement the optical sensor should be set to Channel 2, also known as Channel B, which is displayed on Trace B. Sensor Interface Module Setup: Connect the Proximity Probe to the Proximity Probe Driver Connect the Proximity Probe Driver to the CMCP810‐SIM using the 3 Wire to M12 Adapter Be sure CMCP810‐SIM battery is charger. Plug the Optical Phase Reference Sensor into the CMCP810‐SIM Socket on the Rear Panel Connect the Runout Signal BNC on the Sensor Interface Module to Channel A on the Oscilloscope Connect the Phase Signal BNC on the Sensor Interface Module to Channel B on the Oscilloscope Turn the Sensor Interface Module On www.stiweb.com STI Vibration Monitoring Inc. Published July 2013 League City, Texas USA Page: 3 ... - Page 5 Press F2 to enter the “Reading” menu. Press F1 until “Readings 1” is highlighted. Use arrow keys to highlight “on A” and press enter. Use arrow keys to select “Vac” and press enter. Channel B Setup (Optical Sensor) Press the “Scope” button. Verify Readings in “On”. Press F2 to open the “Reading” menu. Press F1 until “Readings 2” is highlighted. Use arrow keys to highlight “on B” and press enter. Use arrow keys to highlight “Vdc” and press enter. www.stiweb.com STI Vibration Monitoring Inc. Published July 2013 League City, Texas USA Page: 4 ...
- Page 6 Step 5: Once a good pattern is visible on the ScopeMeter press the “Hold/Run” button one time. To measure the amount of electrical runout press the “Cursor” button then press F1 to select the horizontal lines. Use the arrow keys to bring the top and bottom cursors to the very top edge and very bottom edge of the runout signal in between the phase spike so that the measurement is taken during the period of 1 shaft revolution on Trace A. Hit F2 to switch between the top and bottom lines. Note: If the runout signal is not displayed on the oscilloscope screen, adjust the DC offset on the CMCP810‐SIM Sensor Interface Module “Adjust” knob in either direction until the signal is displayed on the screen. Step 5: After the cursors have been placed at the top and bottom of the runout signal, the ScopeMeter will calculate the total amplitude between the two lines and display it at the top of the screen in millivolts. The output of the proximity probe is 200mV/mil on 4140 series steel. To calculate to total amount of runout divide the ScopeMeters reading by the output calibration of the probe. See page 6 for sample screen shot. Ex. ScopeMeter Reads 52mV 52÷200 = 0.26 mils of electrical runout Step 6: Save the file by pressing the “Save” Button. Each save will enter a time stamp and will allow the user to provide a project name. Note: The ScopeMeter’s setup can also be saved so that each time the ScopeMeter is powered on the user can simply recall the setup by pressing the “Save” button and selecting “Recall”. An external USB drive can also be used to save the file for easy PC transfers. Refer to the Fluke user manual for more information on the ScopeMeter and FlukeView software functions. API 670 on Runout: “The combined total electrical and mechanical runout does not exceed 25 percent of the maximum allowed peak to peak vibration amplitude or 0.25 mil (6 micrometers), whichever is greater. The shaft surface finish should be from 16 to 32 micro inches (0.4 to 0.8 micrometers) root mean square.” www.stiweb.com STI Vibration Monitoring Inc. Published July 2013 League City, Texas USA Page: 5 ...
- Page 7 Add a 10 mil thick piece of material on top of the 60 mil piece and measure the output driver. Record this voltage. Step 3: Add a 5 mil thick piece of material on top of the 60 mil and 10 mil pieces and measure the output from the driver. Record this voltage. Step 4: Take the total measurement in millivolts (mV) and divide by 15. This is the probes sensitivity to be used for calculating the total runout with that specific material. Ex. 15 mils = 1350mV 1350 ÷ 15 = 90 mV/mil Proximity Probe Conformance Check: All Proximity Systems (Probe, Cable and Driver) should be tested every once in a while to ensure the probe is still operates within its specified range. This can be done by using a CMCP610 Static Calibrator (sold separately), ‐24 VDC Power Supply and a Digital Volt Meter. The Probe is installed in the tester with the target set against the Probe tip. The micrometer with target attached is then rotated away from the Probe in 0.005" or 5 mil increments. The voltage reading is recorded and graphed at each increment. The CMSS601 Calibrator will produce a voltage change of 1.0 VDC +‐0.05 VDC for each 5 mils of gap change while the target is within the Systems linear range. www.stiweb.com STI Vibration Monitoring Inc. Published July 2013 League City, Texas USA Page: 6 ...
- Page 8 CMCP810‐SIM Manual Rev. A.2 CMCP810 Series Runout Kit Setup and Connections (Provided with Kit) Screenshot Description: Screenshot from Fluke ScopeMeter above Shows 0.3 mils of Electrical Runout 68.0mV ÷ 200mV/mil = 0.3 mils of electrical runout on 4140 series shaft. www.stiweb.com STI Vibration Monitoring Inc. Published July 2013 League City, Texas USA Page: 7 ...
- Page 9 CMCP810‐SIM Manual Rev. A.2 If you have any question or require technical support please feel free to contact our technical services group. STI Vibration Monitoring Inc. League City, Texas USA Tel.: 281.334.0766 Fax: 281.334.4255 www.stiweb.com STI Vibration Monitoring Inc. Published July 2013 League City, Texas USA Page: 8 ...
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