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
39 of 52
W424103 REV A 02/13/01
SWING POTENTIOMETER
SWING POTENTIOMETER
SWING POTENTIOMETER
SWING POTENTIOMETER
AIN5 AND AIN6
AIN5 AND AIN6
AIN5 AND AIN6
AIN5 AND AIN6
The position of the upper structure in relation to the
carrier must be determined. This is accomplished by
means of swing potentiometer mounted in the collector
ring. If the system does not have an input from the swing
potentiometer it will not be able to find a duty.
To check the Swing Potentiometer, use the following
procedure:
1.
Access the Relay and Termination Board.
Check the Analog Drive Voltage. Refer to
page 33
of
this manual.
2. With a digital voltmeter set for DC volts check the
voltage at the connections to the potentiometer
located on the Anti Two-Block board. Connection 1
has a red wire attached to it and connection 3 has a
black wire attached to it.
3. Connect the black lead of the DVM to connection 3
(black wire) and the red lead of the DVM to
connection 1 (red wire). The voltage should be 4.125
+/- 0.1 volts. If this voltage is out of range the
Termination Board will need to be replaced.
4. With the black lead on any 0 Volt terminal, check the
voltage at AIN 5 terminal and AIN 6 terminal. The
voltage should be 4.50 +/- 0.1 maximum and 0.365
+/-0.1 minimum. Both of these voltages should rise
and fall linearly within this range as the upper is
rotated left or right. If the Drive Voltage and the
Voltage at the connection to the potentiometer were
correct and the voltages on AIN 5 and AIN 6 are out
of range the swing potentiometer will need to
replaced.
Contact your distributor or your Factory Service
Department for procedures on replacing the swing
potentiometer
.
+ 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 5 and A IN 6,
V oltage varies
w ith rotation of
upper.
4.2 m axim um .
0.36 m inim um
w hen the upper is
rotating.
1
4
2
3
V oltage m easured betw een 2 and 4 = 5.25 volts.
V oltage m easured betw een 1 and 3 = 4.125 volts.