Part Number 168779-01 Revision NC, September 2004 350900 High Temperature Velocity and Acceleration Sensor Operation and Maintenance Manual
350900 High Temperature Velocity and Acceleration Sensor Operation and Maintenance Manual Copyright 2004 General Electric Company All Rights Reserved. The information contained in this document is subject to change without notice. The following ways of contacting Bently Nevada are provided for those times when you cannot contact your local Bently Nevada representative: Mailing Address 1631 Bently Parkway South Minden, NV 89423 USA Telephone 1 775 782 3611 1 800 227 5514 Fax 1 775 215 2876 Internet www.bently.com About this manual This manual shows how to install the 350900 High Temperature Velocity and Acceleration Sensor, how to verify that it is operating correctly, and how to troubleshoot problems. The following publication contains additional information about this sensor: Title Part Number Description 350900 High Temperature Velocity and Acceleration Sensor Datasheet 168780-01 List of specifications and ordering information for the sensor ii
Installation Installation This section shows how to mount the transducer and electronics and gives guidelines for connecting and routing the integral cable and the interconnect cable. Receiving Inspection The 350900 High Temperature Velocity and Acceleration Sensor (HTVAS) consists of a sensing element, an integral cable, electronics and electronics mounting nut (1-12 UNF). Mounting hardware such as transducer bolts, cushion loop clamps and interconnect cables must be purchased separately. Inspect the components of the order as soon as you receive them to see if any damage occurred during shipping. Keep all shipping forms and invoices. If any shipping damage is apparent, file a claim with the carrier and submit a copy to Bently Nevada. Include all model numbers and serial numbers with the claim. We will either repair or replace damaged parts according to the terms and conditions of the sale. Installing the 350900 sensor Application Advisory If housing measurements are being made for overall protection of the machine, thought should be given to the usefulness of the measurement for each application. Most common machine malfunctions (imbalance, misalignment, etc.) originate at the rotor and cause an increase (or at least a change) in rotor vibration. In order for any housing measurement alone to be effective for overall machine protection, a significant amount of rotor vibration must be faithfully transmitted to the bearing housing or machine casing, or more specifically, to the mounting location of the transducer. In addition, care should be exercised in the physical installation of the transducer. Improper installation can result in a degradation of the transducer's performance, and/or the generation of signals which do not represent actual machine vibration. Upon request, Bently Nevada can provide engineering services to determine the appropriateness of housing measurements for the machine in question and/or to provide installation assistance. 1
350900 High Temperature Velocity and Acceleration Sensor Operation and Maintenance Manual CAUTION The 350900 sensor is designed for high temperature applications. Contact with a hot machine or sensor will cause burns. Allow the machine and sensor to cool before installing or servicing the sensor. Step 1- Locate an area to mount the sensor. Verify that the ambient and surface temperatures do not exceed the range listed in Table 1. Table 1: Operating Temperature Range Component Operating Temperature Range C F Sensor Head -54 to 482-65 to 900 Integral Cable -54 to 482-65 to 900 Electronics -54 to 125-65 to 257 Step 2- Prepare or verify that the mounting surface meets the requirements of Figure 1 and Figure 2. 2 Figure 1: Surface Preparation (dimensions are mm [in])
Installation Figure 2: 350900 Outline Drawing (dimensions are mm [in]) Note: For steps 3 through step 5, refer to Figure 3. Step 3- Mount the sensing element Use four ¼-28 UNF bolts (or equivalent) Torque bolts evenly to 5.65 N-m [50 in-lbs] minimum (higher torque values are possible depending on the bolt grade) Install safety wire fasteners in high temperature or high vibration environments Step 4- Route and install the integral cable. Verify that the ambient and surface temperatures do not exceed the range listed in Table 1. Avoid twisting, kinking or straining the cable Avoid routing the cable near power lines Avoid areas where abrasion will occur Avoid cable bends less than 51 mm [2 in.] radius Secure integral cable at 0.15 m [6 in.] from sensing head using cushion loop clamp Secure integral cable at 0.5 m [18 in.] intervals along remaining integral cable length using cushion loop clamp Step 5- Locate an area to mount the electronics. Verify that the ambient and surface temperatures do not exceed the range listed in Table 1. Fabricate panel 2.3 mm [0.09 in.] to 6.4 mm [0.25 in.] thick with cutout per Figure 3 Avoid twisting the cable more than 45 when inserting the electronics Avoid vibration locations greater than 15g rms Avoid cable bends less than 51 mm [2 in.] radius 3
350900 High Temperature Velocity and Acceleration Sensor Operation and Maintenance Manual Secure integral cable at 0.15 m [6 in.] from the electronics using cushion loop clamp Torque electronics mounting nut to 50-70 N-m [37-52 ft-lbs] Install a safety wire on the mounting nut Figure 3: Sensor, cable and electronics installation (dimensions are mm [in]) Installing the Interconnect/Field Wiring Application Advisory The 350900 sensor provides two signals, one for acceleration and another for velocity. The wires for each signal must be connected to the correct monitor type. If a signal is connected to the wrong monitor type, machinery protection will be lost and incorrect data will be reported. 4 The interconnect cable must be purchased separately. Refer to the datasheet at www.bently.com for more information. Step 1- Hand-tighten connector to the 350900 electronics. Step 2- Route cable Strap cable every 0.6 m [2 ft.] Avoid routing cable near power lines Avoid sharp corners
Step 3- Make electrical connections to the Bently Nevada monitor Consult local authorities for approved installation methods in hazardous areas Follow Figure 4 for electrical connections Current limit non-bently Nevada systems to 40 ma or less Installation Refer to the appropriate Bently Nevada monitor manual for detailed wiring and installation instructions Tightly secure all electrical connections CE Installation Notes Figure 4: Interconnect Field Wiring Cable Note: Unless otherwise specified, output will not deviate by more than 5% FSO (±0.25 Vdc). Test Description Reference Specification Performance Criteria Radiated Emission EN55011 Class B ESD Immunity EN61000-4-2 Criteria A Radiated Immunity EN610004-3 Criteria A Electrical Fast Transient Immunity EN61000-4-4 Criteria A Surge Immunity EN61000-4-5 Criteria A 5
350900 High Temperature Velocity and Acceleration Sensor Operation and Maintenance Manual Conducted Immunity Magnetic Immunity EN61000-4-6 EN61000-4-8 Criteria A Criteria A CE Product Safety EN61010-1 Meets directive These instructions are in addition to those contained elsewhere in this manual. 350900 housing will be connected to ground 350901 field cable or equivalent will be used (see Figure 4) Shields will be connected to ground 6
Field Testing and Troubleshooting Field Testing and Troubleshooting Problem Cause Solution One Channel Output Bias Out of Specification -12 < Vbias < -8 Both Channels Output Bias Out of Specification -12 < Vbias < -8 Vibration amplitude low Vibration amplitude high Noise Faulty field wiring Fault Type 1: Field/Interconnect cable (see page 8) Swapped conductors Fault Type 1: Field/Interconnect cable (see page 8) Faulty sensor Fault Type 2: Sensor Fault (see page 9) Faulty power Check monitor or power supply for power Faulty field wiring Fault Type 1: Field/Interconnect cable (see page 8) Swapped conductors Fault Type 1: Field/Interconnect cable (see page 8) Faulty sensor Fault Type 2: Sensor Fault (see page 9) Channel type is swapped Fault Type 1: Field/Interconnect cable (see page 8) Channel polarity is switched Fault Type 1: Field/Interconnect cable (see page 8) Loose connection Fault Type 1: Field/Interconnect cable (see page 8) Loose sensor mounting Check and re-torque fasteners Improper bracket design Contact Bently Nevada Services Faulty sensor Fault Type 2: Sensor Fault (see page 9) Channel type is swapped Fault Type 1: Field/Interconnect cable (see page 8) Loose connection Fault Type 1: Field/Interconnect cable (see page 8) Loose sensor mounting Check and re-torque fasteners Improper bracket design Contact Bently Nevada Services Faulty sensor Fault Type 2: Sensor Fault (see page 9) Loss of case isolation Fault Type 3: Signals not Related to Machine Vibration (Noise) (see page 9) Ground loops Fault Type 3: Signals not Related to Machine Vibration (Noise) (see page 9) High voltage lines proximity Fault Type 3: Signals not Related to Machine Vibration (Noise) (see page 9) 7
350900 High Temperature Velocity and Acceleration Sensor Operation and Maintenance Manual Fault Type 1: Field/Interconnect cable Interconnect cable is disconnected or connection is loose at the monitor. Visually verify that the sensor is connected to the correct monitor and to the correct electrical terminals. Verify terminals are tight. Interconnect cable is not connected or connection is loose at the sensor. Visually verify that the connector is tight at the sensor. Disconnect the interconnect cable from the monitor and measure the resistance between the following conductor pairs: Measurement Approximate Value Pin 1 to 6 (PWR to COM) 1MΩ <R measure <7MΩ Pin 2 to 3 (Vel+ to Vel-) 1MΩ <R measure <5MΩ Pin 4 to 5 (Accel+ to Accel-) 20kΩ <R measure <200kΩ Resistance outside this range could indicate a faulty cable or sensor. Note: We recommend using an ohmmeter with an open circuit voltage of less than 0.7Vdc for this test. Interconnect Cable is damaged: Shorted Visually inspect the interconnect cable for apparent damage. Disconnect the interconnect cable at both ends. Measure the resistance between conductor pairs and between each conductor and shield of the interconnect cable. Repeat measurement for each conductor until all conductor permutations have been measured. Resistance less than 10MΩ or an intermittent measurement could indicate a faulty cable or field wiring. Interconnect Cable is damaged: Open Visually inspect the interconnect cable for apparent damage. Disconnect the interconnect cable at both ends. Short the following conductor pairs and measure the resistance at the connector: Measurement Approximate Value Pin 1 to 6 (PWR to COM) R measure <100Ω Pin 2 to 3 (Vel+ to Vel-) R measure <100Ω Pin 4 to 5 (Accel+ to Accel-) R measure <100Ω Resistance greater than 100Ω could indicate a faulty cable or field wiring. Velocity and Acceleration Channels are switched. The velocity and acceleration channel DC output bias are similar and cannot be used to identify the channel. Visual verification is necessary. Abnormally low or high vibration readings could indicate reversal of these channel types. Cable conductors are switched Measure the following DC voltage at the monitor terminal: Measurement Pin 1 to 6 (PWR to COM) Pin 2 to 3 (Vel+ to Vel-) Pin 4 to 5 (Accel+ to Accel-) Approximate Value -24 ± 2 Vdc -10 ± 2 Vdc -10 ± 2 Vdc 8
Values outside this range could indicate wiring reversal. Field Testing and Troubleshooting Fault Type 2: Sensor Fault Sensor open or shorted Disconnect the interconnect cable from the sensor and measure the resistance between the following conductor pairs: (refer to Figure 4) Measurement Pin 1 to 6 (PWR to COM) Pin 2 to 3 (Vel+ to Vel-) Pin 4 to 5 (Accel+ to Accel-) Approximate Value 1MΩ <R measure <7MΩ 1MΩ <R measure <5MΩ 20kΩ <R measure <200kΩ Resistance outside this range could indicate a faulty sensor Note: We recommend using an ohmmeter with an open circuit voltage of less than 0.7Vdc for this test. Fault Type 3: Signals not Related to Machine Vibration (Noise) Note: The pins on the sensor connector can easily bend. Use care when performing the following maintenance practices. Sensor signal is not isolated, is shorted to the case, or has noise coupled to the signal. Disconnect sensor from interconnect cable. Measure resistance from connector pin 1,2,3,4,5 and 6 to 350900 case. Measurements less than 100 MΩ could indicate a faulty sensor. Loose or dirty connection at the sensor Disconnect the interconnect cable from the sensor. Clean the connector and check for frayed or broken insulation on the interconnect cable. Carefully clean the connector on the sensor. Hand tighten the interconnect cable to the sensor. Loose connection at the monitor Check the connections at the back of the monitor. Retighten if necessary. Ground differential Machine ground and signal ground should be at the same voltage potential. To check for this, remove the interconnect cable from the sensor. The interconnect cable still needs to be connected to the monitor. Measure the AC voltage between pin 6 (COM) of the interconnect cable and the sensor case. This voltage should be less than 1 volt. A higher voltage is a possible indication of a grounding problem external to the monitor and sensor. This problem must be corrected in order for the sensor to operate properly. 9