Auto Crane HC-5 NEXSTAR, Руководство пользователя, Страница: 39 / 88

39
NexStar Troubleshooting
HC-7X NEXSTAR
Electrical Troubleshooting Table
PROBLEM
POSSIBLE
CAUSE
DIAGNOSIS SOLUTION
The following functions are
inoperable extend, retract,
hoist up, boom up, rotate
cw, and rotate ccw
Low boom
pressure
Check screen for error code.
It would read “BOOM PSI
LOW”
Hoist down (if applicable) and raise
boom off any supports. Alarm will clear
once pressure in cylinder is restored.
Rotate CW is inoperable
Reached limit
for clockwise
rotation.
Check screen for error code,
it would read “CW LIMIT”
Verify the CW limit switch is not
activated. It should be normally closed.
Bad coil, or
damaged wire
Switch coil with another
function coil and check
operation. Inspect wire to coil
Replace coil or repair wiring.
Rotate CCW is inoperable
Reached limit
for clockwise
rotation.
Check screen for error code,
it would read “CCW LIMIT”
Verify the CCW limit switch is not
activated. It should be normally closed.
Bad coil, or
damaged wire
Switch coil with another
function coil and check
operation. Inspect wire to coil
Replace coil or repair wiring.
All functions are
inoperable except boom
down and hoist down.
Pressure
transducer is
disconnected
Check LCD screen. It would
read “BOOM PT ERR”
Verify that pressure transducer located
on the lift cylinder valve block is
plugged into harness. Inspect wiring
going to harness for damage.
Any one function is not
operable
Cut in wire or
bad coil
Switch coil with another
function coil and check
operation. Inspect wire to coil
Replace coil or repair wiring.
Crane operates slowly
Slow rotate
activated
Check screen for error
code. It would read “SLOW
ROTATE ACT”
This is a safety feature that prevents
excessive swinging of heavy loads.
Alarm will reset when load decreases
and function is deactivated.
Close to max
crane load
When the truck is tilted and
under high load a decrease in
rotation speed is possible
Bring load in closer to decrease the
moment load.
All functions operate
slowly
Truck tilt warning
is active
Check screen for error code.
It would read “TRK TILT
WARN”
Move vehicle to level ground. Once
vehicle is on level gound the alarm will
clear.
90% load alarm
is activated.
Check screen for error code.
It would read “90% LOAD
WARN”.
Reduce load to clear alarm.
Boom angle
sensor error
Check screen for error
code. It would read “BOOM
SENSOR ERR”
Check connections to boom angle
sensor. Verify lights are on at sensor
base.
Max speed
function is lower
than 100%
Check screen for speed
setting in bottom right of
screen. The value shown is
the max speed
Reference section 6.8 of this operations
manual to change speed selection.