TwinProx Universal Proximity System (Installation Manual)

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TwinProx_VO

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Installation Manual

The TwinProx family consists of 2 devices, the TwinProx_MB and the TwinProx_VO.
Both the TwinProx_MB and TwinProx_VO are dual channel proximity transmitter system which allows users to use a variety of probe and extension cable combinations (from a variety of traditional manufacturers) without the hassle of using specific drivers and transmitters for each series, tip diameter and extension cable length. The TwinProx_MB and TwinProx_VO both are capable of being setup using an intuitive user interface via an RS485 connection to a computer. All functions are also settable using Modbus read/write commands from any Modbus master. The TwinProx_VO provides a voltage output so customers used to the Proximitor or Probe Driver interface may continue operating within their comfort zone for alarms and shutdown.

Safety Terms and Symbols

Terns that appear in this manual requiring special attention include:

Symbols that may appear on the product and/or this manual include:

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Functional Ground

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High Voltage

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Warning

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Note

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it.

Receiving, Inspecting and Handling the System

Machine Saver ships the probe, extension cable, and TwinProx transmitters as separate units that the user interconnects at the installation site. Carefully remove all equipment from the shipping containers and inspect it for shipping damage. If you see shipping damage, file a claim with the carrier and submit a copy to Machine Saver Inc. Include part numbers and serial numbers on all correspondence. If no damage is apparent and the equipment is not going to be used immediately, return the equipment to the shipping containers and reseal until ready for use. Store the equipment in an environment that is free from any potentially damaging conditions such as extreme temperature, excessive humidity, or a corrosive atmosphere.

Overview

Machine Saver's TwinProx System comes in two versions:

The following sections cover each of these in more detail.

2PRX-MB

The 2PRX-MB signal format is for use when vibration, axial position, rotational speed, or phase measurements will be directly connected to a Modbus Master (PLC, DCS, SCADA system) or other instrumentation
that accepts Modbus RTU (RS485) inputs.
It is powered by +24 VDC. Two optional wires for a private bus can be used with a monitoring system within 20 meters (65 ft) typically used when 360 degree phase analysis is required. The device is configurable to function as either a radial vibration transmitter (peak‐peak vibration displacement amplitude), as an axial position transmitter (with average displacement distance probe gap), as a rotational speed transmitter (shaft speed), and/or as a 360 degree phase analysis transmitter (syncs the analysis data from all the TwinProx devices on the same machine train --- private bus). 

2PRX-VO - Wire Vibration / Position / Speed Transmitter

The 2PRX-VO signal output is compatible with industry-standard continuous-vibration monitoring systems and is the format specified in API Standard 670. It uses ‐24VDC excitation and provides the output signal in mV/mm, typically 7.87 mV/mm (200mV/mil) for 5 mm and 8mm probes and 3.94 mV/mm (100 mV/mil) for 11 mm probes.

Installation

Probe Installation

Mount the probe in a simple bracket in a tapped hole in the bearing cap or by means of a Reverse Mount Probe Housing. The latter arrangement provides an easy means to adjust the probe gap, especially where the target is some distance from the outside surface of the machine.
When inserting the probe into the machine please refer to the user interface Probe Gap instructions. If possible, set the probe gap while the machine is shutdown, to avoid the danger of damaging the probe in the event that it touches the shaft.
Connect the probe to the driver/transmitter using the proper extension cable. If a connector must be replaced, the overall length of the probe or extension cable can be reduced by 2” total without adversely affecting the calibration and linearity. Insulate the probe connector/extension cable connector junction with the connector insulator.

Radial Vibration Measurements

For radial vibration measurements, mount the probe perpendicular to the shaft with the
probe tip approximately 0.050” (1.25 mm) from the shaft surface. Provide the probe tip with
sufficient clearance from surrounding metal to prevent an erroneous output. As a minimum,
the clearance diameter should be 0.75” (19 mm) for the full length of the probe tip. See
Figure 1. You can set the probe gap “visually” to the center of its measurement range by
observing the LED color (reference the LED chart Figure) of the appropriate channel on the TwinProx or by monitoring Modbus registers associated with distance (user interface). The preferred static gap range is 0.030” to 0.050”. To prevent cross-feed between two probes mounted in the same vicinity, maintain a minimum 1.0” (25 mm) spacing between the probe tips. See Figure 2.

 

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Figure_2

Axial Position / Thrust Measurements

For thrust measurements ensure the thrust range is within the probe range. Move the machine to ensure the thrust range is set properly within the probe linear range. For position (thrust) measurements, mount the probe with the probe axis parallel to the
shaft and with the probe tip approximately 0.050” (1.25 mm) from the end of the shaft. For 11 mm diameter probes, this distance is approximately 0.088”(2.2mm). Provide the probe tip with sufficient clearance from surrounding metal to prevent an erroneous output. As a minimum, the clearance diameter should be 0.75” (19 mm) for the full length of the probe tip. For an 11mm probe, the minimum clearance should be 0.88” (22 mm). See Figure 1.
You can set the probe gap “visually” to the center of its measurement range by observing the LED color (reference the LED chart Figure) of the appropriate channel on the TwinProx or by monitoring Modbus registers associated with distance (user interface). The preferred static gap range is 0.030” to 0.050”. To prevent cross-feed between two probes mounted in the same vicinity, maintain a minimum 1.0” (25 mm) spacing between the probe tips. For 11 mm probes, this distance is approximately
1.5” (38mm). See Figure 3.

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Figure_3

Speed Measurements

For RPM measurements, mount the probe with its axis radial to the shaft with its tip approximately 0.050” (1.25 mm) from the outermost surface of the shaft. The probe tip must be provided with sufficient clearance from surrounding metal to prevent an erroneous output. As a minimum, the clearance diameter should be 0.75” (19 mm) for the full length of the
probe tip. See Figure 4. To prevent cross-feed between two probes mounted in the same vicinity, at least 1.0”
(25 mm) spacing between the probe tips should be maintained. See Figures 5, 6.
The minimum keyway depth is 0.060” (1.5 mm). The minimum keyway width and key width
is the diameter of the probe tip (Figure 7). These minimums will ensure that the transmitter or driver responds properly to the keyway at all RPMs. Some experimentation may be required such as adjusting the min and max thresholds on the user interface, adjusting the probe gap, and/or modifying the keyway dimensions, or some combination thereof.
The probe can be mounted in a simple bracket, in a tapped hole in the bearing cap, or by means of a Reverse Mount Probe Housing. The latter arrangement provides an easy way to adjust the probe gap, especially where the target is some distance from the outside surface of the machine.

When inserting the probe into the machine please refer to the user interface Probe Gap instructions. If possible, set the probe gap while the machine is shutdown, to avoid the danger of damaging the probe in the event that it touches the shaft.
Connect the probe to the transmitter using the proper extension cable such that the combined system length of probe + cable matches the transmitter configuration. Do not change the length of the extension cable from the system, as such action will adversely affect the calibration and linearity. If a connector must be replaced, the overall length of the cable can be reduced by 2” without harm, we recommend using the linearity function from the user interface to verify any modifications to probe lengths or system lengths. Insulate the probe connector / extension cable connector junction with the connector insulator.

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Figure_4

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Figure_5

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Figure_6