35
NexStar Troubleshooting
HC-7X NEXSTAR
NexStar Error Code Table
INFO BOX
CAUSE
EFFECT
SOLUTION
BOOM PSI LOW
Boom pressure is
below 80 PSI
Disables all functions
except boom up and
hoist down.
Hoist down (if applicable) and raise boom off
any supports. Alarm will clear once pressure in
cylinder is restored.
CW LIMIT
Crane has reached the
limit of rotation in the
clockwise direction
Disables clockwise
rotation.
Rotate counter-clockwise to clear error. Once
switch is deactivated the alarm will clear.
CCW LIMIT
Crane has reached
the limit of rotation in
the counter-clockwise
direction
Disables counter-
clockwise rotation.
Rotate clockwise to clear error. Once switch is
deactivated the alarm will clear.
TRK TILT WARN Truck angle exceeds
warning angle (if
applicable)
All functions will only
operate at 50% of
speed.
Move vehicle to level ground. Once vehicle is
on level ground the alarm will clear.
TRK TILT ALARM Truck angle exceeds
alarm angle (if
applicable)
All functions disabled.
Move vehicle to level ground. Once vehicle is
on level ground the alarm will clear.
ANTI-2-BLOCK
Anti 2-Block is
activated. Traveling
block has come into
contact with boom tip.
Disables boom down,
extend, and hoist up.
Move load away from boom tip either by
retracting, hoisting down, or booming up.
90% LOAD
WARN
Reached 90% of rated
capacity
Reduces speed of all
functions by 50%.
Reduce load to clear alarm.
100% LOAD
WARN
Reached 100% of
rated capacity
Disables boom down,
extend, and hoist up.
Reduce load by either retracting, booming up,
or hoisting down to clear alarm.
SLOW ROTATE
ACT
Lift cylinder has
exceeded 600 psi.
Reduces rotate
functions by 50%.
This is a safety feature that prevents excessive
swinging of heavy loads. Alarm will reset when
load decreases and function is deactivated.
BOOM SENSOR
ERR
Boom angle sensor
signal failed
All functions are reduced
by 50%.
Check connections to boom angle sensor.
Verify lights are on at sensor base.
BOOM ANGLE
RANGE
Boom angle sensor is
out of range
Operates normally.
Boom angle sensor is mounted incorrectly.
Check mounting. The arrow should be facing
the tip of the crane.
BOOM PT ERR
Boom pressure
transducer error
All functions are
disabled except boom
down and hoist down.
Check connections to pressure transducer
located on lift cylinder. Check wiring harness
for breaks.