JLG 740AJ, Руководство по обслуживанию и ремонту

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SECTION 4 - BOO M & PLATFOR M
4-68 3121160
Turntable Sensor Faulted
8/1 TURNTABLE FAULTED
If the system detects that the Chassis tilt sensor frequency out-
side the 100Hz +/- 5Hz range or the duty cycle is outside 50% +/-
21% range the control system shall report a fault.
Solution:
• Inspect wire harness going to the sensor and UMS module.
• Inspect sensor mounting.
• Replace sensor.
EEPROM checksums failure
9/9 EEPROM FAILURE – CHECK ALL SETTINGS
A critical failure occurred with the EEPROM. Personalities,
machine configuration digits, etc. may be reset to default values
and should be checked.
Solution:
• Contact JLG if message is reoccurring.
4.19 UMS TROUBLESHOOTING AND FAULT
MESSAGES-ADE MACHINES
Backward Stability Concern Message
2/5 UMS SENSOR BACKWARD LIMIT REACHED
When the upright angle relative to the turntable is higher than
+2.5° (away from the work platform), tower lift down will be dis-
allowed immediately. Tower Lift Down will be re-allowed when
the upright angle relative to the turntable is less than 2.0

. If
Tower Lift Down is disabled for more than 1.5 seconds, the
ground boom malfunction indicator lamp, upright tilted lamp
and platform alarm will light/sound continually and a fault shall
be raised. These conditions will be latched along with Tower Lift
Down until the upright angle is less than 2.0

for 2 seconds and
the Tower Lift Down command is returned to neutral.
Solution:
• Inspect sensor mounting.
• Verify sensor calibration on level pad.
• Follow the corrective action listed on decal 1702265
located near the red knob of the machine.
• Inspect machine hydraulics.
Forward Stability Concern Message
2/5 UMS SENSOR FORWARD LIMIT REACHED
When the upright angle relative to the turntable is less than –4.0°
for longer than 1.5 seconds, the ground control boom malfunc-
tion indicator lamp, the platform malfunction indicator lamp,
and platform alarm will light/sound continually and a fault will
be raised. The light/alarm signal will stop only when the upright
angle reaches values greater than –3.0° for 2 seconds.
Solution:
• Inspect sensor mounting.
• Verify sensor calibration on level pad.
• Tower lift down.
• Inspect machine hydraulics.
Auto Detection Input Low Message
2/5 AUTO DETECTION INPUT LOW
If the UMS detects a valid ground module software version but
digital input 2 is not tied high the UMS module shall report a
fault.
Solution:
• Inspect wire harness, there should be 12 volts going into
pin J1-5 (black connector) of UMS module.
UMS Sensor Communications lost
6/6 UMS SENSOR COMMUNICATIONS LOST
If the UMS detects a valid ground module software version but
digital input 2 is not tied high the UMS module shall report a
fault.
Solution:
• Inspect wire harness; CANbus communications are on pins
J2-9 & J2-10 (gray connector) of the UMS module.
• Using access level 1 of the UMS module, under “DIAGNOS-
TICS” CAN, RX/SEC and TX/SEC should be values greater
than 0. Also “BUS OFF:” and “BUS ERR:” should be 0 and
“PASSIVE:” should be a low value.