Hawkeye Goshawk - Manual (Page 3)

Hawkeye Industries Inc. 1-800-910-4295 www.hawk-eye.com
GOSHAWK INSTALLATION, OPERATION AND TROUBLESHOOTING MANUAL. 3
39.) Confirm on the calibration device that when, in the TANK EMPTY POSITION,
the current output is 4 mA. Adjust if necessary, per section 3.5.1.
40.) Gently bring the float back up to the TANK FULL POSITION. Confirm on the
calibration device that the output is 20 mA. Adjust if necessary, per section
3.5.2.
41.) If no adjustments are necessary, calibration is confirmed.
3.6 PREPARING THE GOSHAWK FOR SERVICE
3.6.1 MAKE FINAL CONNECTIONS
42.) Allow the float to return to the TANK EMPTY POSITION (zero).
43.) If external calibration equipment was used for Sections 3.4 and 3.5 (per
Section 3.4.2 B or C)
a.)
power down the equipment and remove from the transmitter
b.) Follow Section 3.4.2 (A) to connect your controller.
3.6.2 CLOSE UP TRANSMITTER
44.) Replace the cover [A] on the transmitter, removed in Section 3.4.1.
45.) Use the 7 / 64 Allen key to tighten the set screw to secure the cover in place.
NOTE: THE GOSHAWK IS NOW FULLY INSTALLED AND READY TO BE POWERED UP
AND PUT INTO SERVICE.
4.0 ADVANCED INSTALLATION
NOTE: BEFORE STARTING INSTALLATION, READ AND UNDERSTAND ALL THE
INSTRUCTIONS PROVIDED BELOW.
4.1 ADJUSTING SPAN SENSITIVITY
In situations where the encoding potentiometer [G] makes fewer than 9 turns to go
from the TANK EMPTY POSITION to the TANK FULL POSITION, adjusting the Span
Sensitivity can increase the precision of the R19(SPAN) trimmer [U]. In normal
circumstances, the factory default range setting of 180 Ω will be adequate to set span.
Only adjust the Span Sensitivity if you find the span range or sensitivity inadequate.
4.1.1 TOOLS REQUIRED
Electrical Connections & Calibration
Allen Key .................................................................................. 7 / 64 in
Screw Driver ........................................................... 1 / 8 in wide Slot Driver
Multimeter ...................................................................... Fluke 187 or Eq.
With: ............................................................ Spring Hook test Leads
4.1.2 REMOVE COVER
WARNING: FAILURE TO DE-ENERGIZE THE TRANSMITTER BEOFRE REMOVING THE
COVER MAY RESULT IN SHOCK OR EXPLOSION.
1.) Ensure the Goshawk is not energized.
2.) Remove the cover [A], per Section 3.4.1
4.1.3 DETERMINE REQUIRED SPAN SENSITIVITY
SETTINGS
3.) Refer to the charts below to select the resistance values from the first column
that is required for R10 and R13 based on your span range. The default R10
and R13 setting is 180 Ω. It is recommended to select the next highest
resistance for R10 and R13 for the desired sensitivity, and work downward fr
there if required.
REDTAIL HAWK SPAN RANGE
Goshawk I Goshawk II Goshawk III
R10 &
R13
(Ω)
Min
(ft.) Max
(ft.) Min
(ft.) Max
(ft.) Min (ft.) Max
(ft.)
30 4.75 19.50 7.13 29.25 11.88 48.75
70 4.75 21.00 7.13 31.50 11.88 52.50
80 4.75 22.50 7.13 33.75 11.88 56.25
110 6.25 22.50 9.38 33.75 15.63 56.25
140 6.25 24.00 9.38 36.00 15.63 60.00
180 6.25 25.50 9.38 38.25 15.63 63.75
ROADSIDE HAWK SPAN RANGE
Goshawk I Goshawk II Goshawk III
R10 &
R13
(Ω)
Min
(ft.) Max
(ft.) Min
(ft.) Max
(ft.) Min (ft.) Max
(ft.)
30 2.25 9.25 3.38 13.88 5.63 23.13
70 2.25 10.00 3.38 15.00 5.63 25.00
80 2.25 17.75 3.38 16.13 5.63 26.88
110 3.00 10.75 4.50 16.13 7.50 26.88
140 3.00 11.50 4.50 16.13 7.50 26.88
180 3.00 12.00 4.50 18.00 7.50 30.00
NOTES: THE HEIGHTS IN THE CHARTS ABOVE DO NOT INDICATE A MEASUREMENT
RANGE (I.E. ZERO TO SPAN), BUT THE SPAN RANGE (I.E. MINIMUM SPAN TO
MAXIMUM SPAN) THAT CAN BE SET FOR THAT PARTICULAR GAUGE HEAD AND
TRANSMITTER COMBINATION.
INCREASING THE SPAN SENSITIVITY DECREASES THE SPAN RANGE, AND IS
ACHIEVED BY LOWERING THE RESISTANCE OF THE R10 AND R13 TRIMMERS.
DECREASING THE SPAN SENSITIVITY INCREASES THE SPAN RANGE, AND IS
ACHIEVED BY RAISING THE RESISTANCE OF THE R10 AND R13 TRIMMERS.
4.1.4 ADJUST SPAN SENSITIVITY
CAUTION: IF THE TRANSMITTER IS POWERED WHILE MEASURING R10 AND R13,
INACCURATE RESITSTANCES WILL BE MEASURED. ENSURE THE TRANSMITTER IS
DE-ENERGIZED BEFORE PROCEEDING
4.) Locate R10 [S] and Test Posts TP1 & TP2 [T].
FIGURE 11 R10, TP1 AND TP2 LOCATION [STEPS 4.) TO 8.)]
5.) Set the multimeter to read resistance (Ω)
6.) Connect the spring hook test leads to TP1 and TP2 [T]. Polarity is
unimportant.
7.) Adjust R10 [S] to the value determined in 4.1.3.
a.)
Turn R10 [S] CLOCKWISE to decrease resistance.
b.) Turn R10 [S] COUNTERCLOCKWISE to increase resistance.
8.) Locate R13 [R] and Test Posts TP3 & TP4 [Q].
FIGURE 12 R13, TP3 AND TP4 LOCATION [STEPS 9.) TO 11.)]
9.) Connect the spring hook test leads to TP3 and TP4 [Q]. Polarity is
unimportant.
10.) Adjust R13 [R] to the value determined in 4.1.3.
c.)
Turn R13 [R] COUNTERCLOCKWISE to decrease resistance.
a.) Turn R13 [R] CLOCKWISE to increase resistance
11.) Remove test leads, and perform calibration steps from Section 3.4 onward.
IMPORTANT: IT IS IMPERATIVE THAT R10 AND R13 ARE EQUAL BEFORE
PROCEEDING TO CALIBRATION.
4.2 NON-EMPTY ZERO POINT ESTIMATION
In situations where the Goshawk is installed and calibrated on an in-service tank where
the gauging system cannot be put into the TANK EMPTY POSITION, this procedure
allows a close estimation for calibration.
IMPORTANT: THIS METHOD IS A STOP GAP, AND DOES NOT REPLACE FULL
CALIBRATION, AS PER 3.5. THE FULL CALIBRATION FROM 3.5 SHOULD BE
PERFORMED AS SOON AS REASONABLY POSSIBLE.
4.2.1 DETERMINE CURRENT TANK FILL PERCENTAGE
1.) If not already there, allow the float to return to the liquid level by disengaging
clamps put in place following Section 3.3.5
2.) Read and record the current tank level as displayed by the external indicator,
noting display units.
3.) Divide the current level by the maximum (TANK FULL) level, in the same
units. This will be a number between 0 and 1.
4.2.2 DETERMINE NEW TARGET ZERO POINT
4.) Multiply the number from 3.) by 16 mA, and then add 4 mA to this number.
5.) Use the answer from 4.) as the target Zero Point in 3.5.1 instead of 4 mA.
4.2.3 PERFORM BALANCE OF CALIBRATION
6.) Set the span per 3.5.2.
7.) Confirm the calibration per 3.5.3.
4.2.4 NON-EMPTY TARGET ZERO FORMULA
Target Zero mA 16 4
5.0 PART REPLACEMENT
NOTE: BEFORE STARTING ANY OF THESE PROCEDURES, READ AND FULLY
UNDERSTAND ALL THE INSTRUCTIONS PROVIDED BELOW.
5.1 REPLACING THE PCB
5.1.1 TOOLS REQUIRED
Allen Keys .................................................................................. 7 / 64 in
Screw Driver ......................................................... Phillips or Slot (will vary)
Wrench ................................................................................. 7 / 16 in.
5.1.2 REMOVE GOSHAWK FROM THE GAUGE HEAD
1.) Use the 7 / 16 wrench to remove the two retaining bolts holding the
transmitter to the gauge head, and pull the transmitter off of the gauge head.
5.1.3 REMOVE GOSHAWK COVER
WARNING: FAILURE TO DE-ENERGIZE THE TRANSMITTER BEOFRE REMOVING THE
COVER MAY RESULT IN SHOCK OR EXPLOSION.
2.) Ensure the Goshawk is not energized.
3.) Use the 7 / 64 Allen Key to loosen the staking screw [B] on the cover [A].
4.) Unscrew the cover [A] and set down. The PCB [H] and terminal blocks
[E],[F] will be visible. Ensure the sealing O-ring between the cover [A] and
box [C] remains in place on the box.
5.1.4 REMOVE PCB
5.) Disconnect both the Orange Power terminal plug [E] and the grey Encoding
Potentiometer terminal plug [F].
6.) Remove the two Philips (or slot) screws securing the PCB to the standoffs.
Remove the PCB and set aside.
5.1.5 REASSEMBLE
7.) Remove the new PCB [H] from the ESD bag place on the standoffs.
8.) Reinstall the two Philips (or slot) screws.
9.) Reconnect the terminal plugs [E] & [F].
10.) Proceed to installation calibration, per Section 3.3 onward.
FIGURE 13 REMOVING THE PCB [STEPS 5.) TO 10.)]
IMPORTANT: AFTER REPLACING THE PCB, IT IS VITAL THAT THE CALIBRATION
STEPS FROM 3.3 ONWARD ARE FOLLOWED.
5.2 REPLACING THE ENCODING
POTENTIOMETER
5.2.1 TOOLS REQUIRED
Allen Keys ................................................................................. 3 / 32 in
Screw Driver ...................................................... Phillips or Blade (will vary)
and ........................................................... 1 / 8 in wide Slot Driver
Wrench .................................................................................. 1 / 2 in.
5.2.2 REMOVE PCB
1.) Follow to Sections 5.1.2, 5.1.3 and 5.1.4 to remove the Goshawk from the
gauge head, and to remove the PCB [H].
5.2.3 REMOVE THE ENCODING POTENTIOMETER
2.) Use the 3/32 Allen key to back off the set screws securing the operator shaft
[J] to the Encoding potentiometer [G]. Keep the set screws in the shaft if
possible.
3.) Pull the Encoding Potentiometer [G] and H-Clip [I] away from the operator
shaft [J].
4.) Use the 1 / 2 wrench to undo the nut and lock washer holding the H-Clip [I]
to the Encoding Potentiometer [G].
5.) Use the blade screw driver to loosen the connections on the terminal block
[F] and set the terminal block aside for reuse.
6.) Discard the removed Encoding Potentiometer [G].
FIGURE 14 REMOVING THE POTENTIOMETER AND POTENTIOMETER
CONNECTIONS [STEPS 2.) TO 11.)]
5.2.4 REPLACE THE ENCODING POTENTIOMETER
7.) Install the H-Clip [I] on the new Encoding Potentiometer [G].
8.) Connect the cables from the new Encoding Potentiometer [G] to the terminal
block [F], noting the following color codes:
Terminal 1 .................................................................................. WHITE
Terminal 2 .................................................................................... BLUE
Terminal 3 ............................................................................... YELLOW
9.) Reinstall the Encoding Potentiometer [G] and H-Clip [I] assembly in the
Operator Shaft [J]. Ensure the arms of the H-Clip [I] are each straddling the
standoffs [K], and the H-Clip [I] is not free to rotate.
10.) Use the 3/32 Allen Key to tighten the set screws holding the Encoding
Potentiometer [G] to the Operator Shaft [J].
11.) Replace the PCB [H] and Cover [A] following Sections 5.1.2 and 5.1.4 in
reverse.
12.) Follow from Section 3.3 onward to remount the transmitter.
CAUTION: AFTER REPLACING THE POTENTIOMETER, IT IS VITAL THAT THE
PREPARATION AND MOUNTING DIRECTIONS OF SECTION 3.3 ARE FOLLOWED,
OTHERWISE DAMAGE TO THE ENCODING POTENTIOMETER WILL OCCUR AND THIS
PROCEDURE WILL HAVE TO BE REPEATED WITH A NEW ENCODING
POTENTIOMETER.