Greer Company
Greer Company
Greer Company
Greer Company
Crane Systems
1918 EAST GLENWOOD PLACE, SANTA ANA, CA 92705
Tel: (714) 259 9702 Fax: (714) 259 7626
MicroGuard
424 Operation/Troubleshooting Manual Horizontal Display Hydraulic Cranes
38 of 52
W424103 REV A 02/13/01
BOOM ANGLE SENSOR AIN3
BOOM ANGLE SENSOR AIN3
BOOM ANGLE SENSOR AIN3
BOOM ANGLE SENSOR AIN3
1. Place the main boom at a 0° angle. Verify that it is at
a 0° angle with an inclinometer.
2. Access the Terminal Connection Board. Check the
Analog Drive Voltage. Refer to page 36 of this
manual.
3. With a digital voltmeter set for DC Volts, connect the
negative lead of the meter to any 0 Volt terminal of
the Analog Input Group.
4. Connect the positive lead to the AIN 3 terminal of the
Analog Input Group.
5. With the boom horizontal, the voltage should be
0.4
±
0.1 volts.
6. Raise the main boom to a 60° angle. With an
inclinometer, verify that the main boom is at a 60°
angle.
7. With the boom at a 60° angle, the voltage should be
3.02
±
0.1 volts.
8. If this is out of range, remove the cover from the
reeling drum located on the left side of the main
boom.
9. Under the cover on the right side of the extension
reel you will see a terminal strip. This terminal strip
has six wires connected to the bottom screws.
10. With a digital voltmeter set to read DC Voltage, place
the negative lead on the terminal with the blue wire
attached to it (- Drive) and the positive lead on the
terminal with the red wire attached to it (+Drive).
11. The voltage should be 5.25
±
0.1 volts. If this voltage
is out of range and the Analog Drive Voltage
checked in step 2 was OK, then it is possible that the
reeling drum cable is open or grounded between the
Computer and the Extension Reel. Check all
connections and plugs between these two
components. Repair or replace as required. Refer to
the MicroGuard
414 wiring details in the Installation
Manual for the model of crane under test.
12. With the negative lead of the voltmeter connected to
blue, drive negative and the positive lead of the
voltmeter connected to green, angle signal, the
voltage should be the same as the voltage measured
at AIN3 of the analog input group in the computer. If
this voltage is not the same it is possible that the
cable between the reel and the computer is faulty or
the boom angle sensor is faulty.
13. If the above voltage checks are within range and no
grounds or opens are found in the wires, replace the
Boom Angle Sensor as described on
page 44
of this
manual.
+ D R
0V
-D R
+ D R
0V
+ D R
-D R
-D R
0V
A IN 0
0V
0V
A IN 2
A IN 1
-D R
A IN 5
A IN 6
A IN 3
0V
0V
+ V P
+ V P
+ V P
+ V P
0V
+ D R
+ D R
0V
TX 0-
TX 0+ A IN 4
TX 1+
TX 1-
-D R
D RIV E
V O LTA G E.
A IN 3, V oltage
varies w ith
boom angle.
2.6 at 0 deg.
3.5 at 60 deg.
RED
D R +
BLU E
D R-
G REEN , A N G LE
SIG N A L TO A IN 3