Young Intrinsically Safe Wind Monitor Model 05501 - Manual (Page 4)

Page 3
05501LM-90(D)
*Max set screw torque 80 oz-in
WIND SPEED
Remove the propeller and connect a Young Model 18802 Anemometer
Drive to the propeller shaft. Connect the instrument to a signal
conditioning circuit indicating wind speed.
Set the Anemometer Drive to various rates and observe the Wind Monitor
output. Indicated speed should agree with actual speed within ±0.5 m/s.
Use the following formulas:
Speed is in meters per second (m/s).
Details on checking bearing torque, which affects wind speed and
direction threshold, appear in the following section.
MAINTENANCE
Given proper care, the Wind Monitor should provide years of
service. The only components likely to need replacement due to
normal wear are the precision ball bearings and the wind direction
potentiometer. Only a qualified instrument technician should perform
the replacement. If service facilities are not available, return the
instrument to the company. Refer to the drawings to become familiar
with part names and locations. The asterisk * which appears in
the following outlines is a reminder that maximum torque on all set
screws is 80 oz-in.
ELECTRONIC REPAIR MAY BE PERFORMED
ONLY BY QUALIFIED TECHNICIANS.
SUBSTITUTION OF COMPONENTS
MAY IMPAIR INTRINSIC SAFETY.
POTENTIOMETER REPLACEMENT
The potentiometer has a life expectancy of fifty million revolutions.
As it becomes worn, the element may begin to produce noisy signals
or become non-linear. When signal noise or non-linearity becomes
unacceptable, replace the potentiometer. Refer to exploded view
drawing and proceed as follows:
1. REMOVE MAIN HOUSING
a) Unscrew nose cone from main housing. Set o-ring aside for
later use.
b) Remove 4 screws attaching housing.
c) Gently push main housing latch.
d) While pushing latch, lift main housing up and remove It from
vertical shaft bearing rotor.
2. UNSOLDER TRANSDUCER WIRE
a) Remove junction box cover, exposing circuit board.
b) Remove screws holding circuit board.
c) Unsolder three potentiometer wires (white, green, black), two
wind speed coil wires (red, black), and earth ground wire (red)
from board.
3. REMOVE POTENTIOMETER
a) Loosen set screw on potentiometer coupling and remove it from
potentiometer adjust thumbwheel.
b) Loosen set screw on potentiometer adjust thumbwheel and
remove it from potentiometer shaft.
c) Loosen two set screws at base of transducer assembly and
remove assembly from vertical shaft.
d) Unscrew potentiometer housing from potentiometer mounting
& coil assembly.
e) Push potentiometer out of potentiometer mounting &
coil assembly by applying firm but gentle pressure on
potentiometer shaft. Make sure that the shaft o-ring comes out
with the potentiometer. If not, then gently push it out from the
top of the coil assembly.
4. INSTALL NEW POTENTIOMETER
a) Push new potentiometer into potentiometer mounting & coil
assembly making sure o-ring is on shaft.
b) Feed potentiometer and coil wires through hole in bottom of
potentiometer housing.
c) Screw potentiometer housing onto potentiometer mounting &
coil assembly.
d) Gently pull transducer wires through bottom of potentiometer
housing to take up any slack. Apply a small amount of silicone
sealant around hole.
e) Install transducer assembly on vertical shaft allowing 0.5 mm
(0.020") clearance from vertical bearing. Tighten set screws* at
bottom of transducer assembly.
f) Place potentiometer adjust thumbwheel on potentiometer shaft
and tighten set screw*.
g) Place potentiometer coupling on potentiometer adjust
thumbwheel. Do Not tighten set screw yet.
5. RECONNECT TRANSDUCER WIRES
a) Using needle-nose pliers or a paper clip bent to form a small
hook, gently pull transducer wires through hole in junction box.
b) Solder wires to circuit board according to wiring diagram.
Observe color code.
c) Secure circuit board in junction box using two screws removed
in step 2b. Do not overtighten.
6. REPLACE MAIN HOUSING
a) Place main housing over vertical shaft bearing rotor. Be careful
to align indexing key and channel in these two assemblies.
b) Place main housing over vertical shaft bearing rotor until
potentiometer coupling is near top of main housing.
c) Turn potentiometer adjust thumbwheel until potentiometer
coupling is oriented to engage ridge in top of main housing.
Set screw on potentiometer coupling should be facing the front
opening.
d) With potentiometer coupling properly oriented, continue pushing
main housing onto vertical shaft bearing rotor until main
housing latch locks into position with a “click”.
7. ALIGN VANE
a) Connect excitation voltage and signal conditioning electronics
to terminal strip according to wiring diagram.
b) With mounting post held in position so junction box is facing
due south, orient vane to a known angular reference. Details
appear in CALIBRATION section.
c) Reach in through front of main housing and turn potentiometer
adjust thumbwheel until signal conditioning system indicates
proper value.
d) Tighten set screw* on potentiometer coupling.
8. REPLACE NOSE CONE
a) Screw nose cone into main housing until o-ring seal is
seated. Be certain threads are properly engaged to avoid cross-
threading.






× + =
50
16 4
speed
mA
RPM speed Ч = 0049 . 0