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If the pole is metal it should be well grounded electrically to minimize the probability of any lightning damage. Turn the anemometer on the pole so that the setscrew on the anemometer base is facing True North. Tighten the setscrew to fix the directional orientation. 4.3 Transmitter Installation Mount the transmitter assembly in a covered location where it can be conveniently connected to its exterior wind sensor. The six-wire cable to the wind sensor may be extended to up to 250 feet in length without degrading the accuracy of its measurements. Orient the sensor so that the setscrew in its base is pointing to North. Use care not to puncture the jacket of the interconnecting cable if staples are used to secure it. The standard wind sensor is supplied with 40 feet of cable. In the event that the interconnecting cable needs to be extended, use good splicing techniques and waterproof the splice if it will be exposed to the weather. I/O connection terminal strips are located at the top edge of the printed circuit board. Terminal functions with the corresponding colors of the wind sensor interconnecting cable are as follows: 0 1 1 0 1 Jl 1 Speed Input + (White) l 2lol I Speed Input -(Black) 5 l o ll• -(Yellow)I Direction Return 06 0 Unused (Blue) 01 0 52 Wind Speed plc Loop + a2 0 -Sneed ~lc LOODWind 01 0 53 Wind Direction plc Loop + a2 0 -Wind Direction plc Loop 5.0 OPERATIONAL CHECKOUT Connect the speed and wind direction process control loops to the appropriate locations of the terminal strip of the printed circuit board as shown on the earlier chart. For test purposes, you may wish to use an unregulated but filtered source of lo- to 24-volt DC power having a precision 100 ohm resistor (preferably f 1% accuracy) connected in a series with the supply. The loop powered encoding circuits requires the proper polarity of loop current; however, diodes are included to protect the circuitry against the case of a reversed polarity connection. Connect the test leads of a digital voltmeter across the resistor to measure the plc lo.9 current. The measured wind speed and direction at several cardinal calibration points should correspond to the following: Wind Direction Wind Speed (mph) Loop Current (mA) V 1000 (Volts) N+ 0.0 4.0 0.4 NE = 45” 12.5 6.0 0.6 E = 90” 25 8.0 0.8 SE = 135 ” 37.5 10.0 1.0 S = 180 ” 50 12.0 1.2 II SW = 225” I 62.5 I 14.0 I 1.4 W = 270” 75 16.0 1.6 NW = 315” 87.5 18.0 1.8 II N-I 100 I 20 .0 I 2.0 5.1 Circuit Board Adjustments Multiple turn potentiometers on the printed circuit board are provided for independent gain and offset adjustment of both the speed and direction channels as follows: ::: ““ The WMS-22 normally should not require adjustment of these controls. An exception occurs if for any reason the wind sensor is changed or if the cabling to the wind sensor exceeds 200 feet in length. In these cases the span control of the direction channel may require a slight adjustment. A movable jumper is included on the PC board direction channel to facilitate checking its offset and span adjustments. To use this feature, remove the jumper normally in place at the “JW”position and move it to the “JO” position. This should force the wind direction loop current to its zero scale or 4 mA level. If necessary, adjust R-25 to obtain this value, noting that counterclockwise rotation of its adjustment screw will cause the offset value to increase. Moving the jumper position to the “JF” location will cause the loop current to its full scale value of 20 mA. If necessary, adjust R-24 to obtain this value noting that counterclockwise rotation of its adjustment screw will cause an increase in the span. If either the span or offset trim are changed, it is suggested that both values be checked, since there is some slight interaction between the two adjustments. Be sure to return the jumper to the JW position at the conclusion of this adjustment procedure. The Wind Speed channel should not normally require adjustment in the field. 4 5II + + l- -- DC PO W ER - SOURC E TYPICAL LOAD 10lo 48 VDC PRODUCES OUTPUTS MOD E L Z OO -W S -2 2 CURREN T L OO P W I NDS TAT I O N TYP I CA L W I R I NG W I T H A S I NG L E PO W ER SOURC E L Ei - = I IJ I I II - WARRANTY ree of defects in mat satisfactory service for a period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired or replaced at no charge. However, this WARRANTY is VOID, if the unit shows evidence of having been tampered with or shows evidence of being damaged as a result of excessive cor...

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