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034E-9800 REV A

Page 17

4.3

Wind Direction Potentiometer Replacement

Follow Steps A through G in Section 4.2

Replace old removed potentiometer assembly (item 3) with new.

Follow Steps J through O in Section 4.2 to install new Pot/Mount Assembly.

Slip Vane Hub onto pot shaft and adaptor, aligning the flat with the set screw in
the upper side of the vane hub. Tighten the set screw. Reinstall alignment
adaptor and screw as seen in Step D.

Refer to Figure 4-5. Connect an ohmmeter to pins 3 and 4 of the cable connector
(Item 9) mounted on the lower side of the sensor housing.

The resistance measured across pins 3 and 4 should be approximately equal to
the resistance measured across pins 3 and 5 (approx. 6k ohms).

Remove shoulder screw. Rotate vane assembly clockwise ¼ turn as viewed
from above. Check that the resistance between pins 3 and 4 is 8.5k ohms

Unit is now ready for service.

Содержание 034E

Страница 1: ...0 REV A Page 1 Met One Instruments Inc Corporate Sales Service 1600 NW Washington Blvd Grants Pass OR 97526 Tel 541 471 7111 Fax 541 471 7116 www metone com service metone com 034E WIND SENSOR OPERATION MANUAL ...

Страница 2: ...034E 9800 REV A Page 2 ...

Страница 3: ...permission of Met One Instruments Inc Technical Support Should you require support please consult your printed documentation to resolve your problem If you are still experiencing difficulty you may contact a Technical Service representative during normal business hours 7 00 a m to 4 00 p m Pacific Standard Time Monday through Friday Voice 541 471 7111 Fax 541 471 7116 E Mail service metone com Mai...

Страница 4: ...uce a series of contact closures in a magnetic reed switch The frequency of the closures is proportional to wind speed The wind direction sensor uses a balanced anodized aluminum vane assembly that changes the value of a linear potentiometer as the wind direction changes The output of the potentiometer is proportional to the wind direction A 1K ohm resistor in series with the wiper provides protec...

Страница 5: ...al 0 360 Degrees Electrical 0 355 Degrees Starting Threshold 0 9 mph Accuracy 3 Degrees Damping Ratio 25 Std 4 to 6 optional Resolution 0 5 Degrees Temperature Range 50 Degrees C to 70 Degrees C non icing conditions Weight 2 lb 9 oz With cable Output signal Wind Speed Pulsed contact closure Maximum current 5mA Wind Direction Potentiometer output 0 10K ohms Maximum current 10mA Maximum open circuit...

Страница 6: ...ccurate alignment when the magnetic correction to true has been established D When the sensor is properly aligned tighten the adapter set screw using the 5 32 Allen wrench By removing the socket head screw in the adapter the sensor may be removed and replaced without realignment E Remove and retain the alignment adaptor and screw from the vane hub Check to see that the vane assembly rotates freely...

Страница 7: ...ta logger or an ohmmeter Refer to Frequency vs Wind Speed Table 3 1 Spin slowly and monitor output signal A wind speed calibrator may be used to check operation at different RPM points The vane and counterweight must both be removed for connection to the calibrator motor drive C The 034E wind sensor should be inspected periodically for physical damage to the vane assembly and cable connections Ins...

Страница 8: ... 50 29 55 59 10 50 00 31 11 62 23 52 50 32 68 65 36 55 00 34 24 68 49 57 50 35 81 71 61 60 00 37 37 74 74 62 50 38 94 77 87 65 00 40 50 81 00 67 50 42 07 84 13 70 00 43 63 87 26 72 50 45 19 90 39 75 00 46 76 93 52 CALIBRATION EQUATIONS V mph RPM 0 63 16 787 V mps RPM 0 28 37 547 V mph FHZ 0 63 0 5596 V mps FHZ 0 28 1 2517 SPEED IN MILES HR V mph RPS F Hz 10 00 2 62 5 24 20 00 5 42 10 84 30 00 8 22...

Страница 9: ... 60 20 33 34 1100 00 29 58 66 16 36 67 1200 00 32 24 72 11 40 00 1300 00 34 90 78 07 43 34 1400 00 37 57 84 03 46 67 1500 00 40 23 89 98 50 00 1600 00 42 89 95 94 53 34 1700 00 45 56 101 90 56 67 1800 00 48 22 107 86 60 00 1900 00 50 88 113 81 63 34 2000 00 53 55 119 77 66 67 2100 00 56 21 125 73 70 00 2200 00 58 87 131 68 73 34 2300 00 61 54 137 64 76 67 2400 00 64 20 143 60 80 00 2500 00 66 86 1...

Страница 10: ...lacement of Wind Speed Sensor bearings 24 36 month intervals A Recommended complete factory overhaul of sensor Schedule is based on average to adverse environments TABLE 4 1 TROUBLESHOOTING TABLE Symptom Probable Cause Remedy No WS Sensor output Faulty bearings Replace bearings REF 4 2 No WD Sensor output Faulty pot assembly Replace pot assy REF 4 3 No WS Sensor output Faulty reed switch Replace r...

Страница 11: ... blocks B Refer to figure 4 2 With small flat bladed screwdriver loosen the three wire contacts of the white green yellow wires in positions 3 4 and 5 of the J1 terminal block going to the wind direction potentiometer Gently pull the wires free from the terminal block and straighten them enough to allow easy passage through the stem on the top of sensor Screw Item 1 Green J1 3 Black J1 4 White J1 ...

Страница 12: ...h pin located on the outer edge of the Top Plate Assembly to allow proper closure Install the screw D Refer to Figure 4 3 To facilitate maintenance and to minimize the risk of damage support the sensor upright in the foam packing as shipped or some other method FIGURE 4 3 D Remove the alignment adaptor and screw if installed ...

Страница 13: ...034E 9800 REV A Page 13 E Remove the wind direction vane if installed Using a 5 64 allen wrench loosen the center hub set screw 1 to 2 turns and lift the vane up and off ...

Страница 14: ...crew located in the side of the wind vane hub The turn loosening will enable easier alignment of the pot mount assembly during the re assembly process G Carefully remove entire vane potentiometer assembly from body of sensor Use care to avoid snags when withdrawing the wires from the top stem ...

Страница 15: ...contact using a cotton swab and alcohol CUP ASSEMBLY AND BEARINGS CAUTION DO NOT LUBRICATE OR FORCE BEARINGS I Install new bearings Item 12 and cup assembly Item 2 onto stem NOTE If potentiometer needs replacement now refer to Section 4 3 NOTE If reed switch needs replacement now refer to Section 4 4 ...

Страница 16: ...e flat alignment has been accomplished L Spin the Cup Assembly to check for freedom of rotation There should be a small amount of up and down play Approximately 010 M Re open sensor body connect pot wires in terminal block matching wire colors as in Step B N Prior to final closure of sensor body inspect inside Ensure that wires are routed as to prevent pinching or over straining Make sure wires do...

Страница 17: ...ide of the vane hub Tighten the set screw Reinstall alignment adaptor and screw as seen in Step D E Refer to Figure 4 5 Connect an ohmmeter to pins 3 and 4 of the cable connector Item 9 mounted on the lower side of the sensor housing F The resistance measured across pins 3 and 4 should be approximately equal to the resistance measured across pins 3 and 5 approx 6k ohms G Remove shoulder screw Rota...

Страница 18: ...itch cartridge out of its seat Clean off any old sealant from the Top Plate Assembly E Refer to Figure 4 6 Apply a small bead of RTV silicone sealant under cartridge flange Noting proper orientation push into hole F Wipe away excess sealant Allow for overnight curing before reassembly G Using care to avoid stressing switch leads while routing connect the switch wires in the terminal strip Match wi...

Страница 19: ... 10969 993000 3368 601850 VANE ASSEMBLY CUP ASSEMBLY POT MOUNT ASSEMBLY WASHER SPLIT 6 SCREW PAN HD 6 32 X SENSOR HOUSING MOUNT BRACKET TERMINAL BLOCK TERMINAL BLOCK PCBA SCREW 6 32 x 3 8 PAN HD CONNECTOR WIRING ASSEMBLY TOP PLATE STEM ASSEMBLY BEARING SET SCREW 4 40 x 3 16 CUP PT SPACER SLEEVE REED SWITCH ASSY SCREW 6 32x5 8 PAN HD SET SCREW 8 32 x 3 8 BRASS TIP SET SCREW 8 32 x 3 16 WD ALIGNMENT...

Страница 20: ...034E 9800 REV A Page 20 FIGURE 4 7 EXPLODED PARTS VIEW OF 034E ...

Страница 21: ...customer vane replacement is performed the balance of the assembly must be verified prior to returning the sensor to service 1 Install replacement vane A Insert the vane tail shaft into the hub Make sure the shaft is fully seated at the bottom of its hole B Rotate vane to align axis to sensor body and tighten set screw to secure vane assembly ...

Страница 22: ...f balancing is required loosen both counterweight set screws using a 5 64 hex key and move the counterweight on the shaft as required to establish balance Do NOT remove the shaft from the hub NOTE Position the counterweight on the stem so that the set screw holes face towards the sensor base This will prevent moisture from collecting in the screw holes during sensor operation D Tighten the set scr...

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