Nexstar Iii Electrical Troubleshooting Table - Vanguard CPW 125-4-S Series Operation And Maintenance Manual

6.1.5 NEXSTAR III ELECTRICAL
Problem
Jammed transmitter button
Short in wiring harness
CRANE MOVES
UNEXPECTEDLY
Receiver locked up
Transmitter turned off
E-stop active
Receiver turned off
Low battery
NO FUNCTION
OPERATES ON
THE CRANE
Receiver locked up
Truck tlt alarm active
Anti-two block
BOOM DOWN,
EXTEND, HOIST
UP ARE
INOPERABLE.
Crane overload
EXTEND,
Low boom pressure
RETRACT, HOIST
UP, BOOM UP,
ROTATE CW,
ROTATE CCW
ARE
INOPERABLE
TROUBLESHOOTING TABLE
Cause Effect
Activate e-stop to see if movement
stops
Unexpected movement would only
occur when multi-functioning. Unplug
the coil to see if movement stops.
Check amperage to coil using
multimeter in line with coil. It should be
no more than 100ma
Bottom right corner is a circle with an
arrow. This should be rotating at all
times when the crane is turned on
Screen on transmitter is off
Check LCD screen. Error stating e-stop
is active displays on screen.
Check the LCD screen, if it is blank, the
receiver is turned off.
While the transmitter is turned on, the
battery indicator on the LCD screen
should be at least 10%.
Bottom right corner is a circle with an
arrow. This should be rotating at all
times when the crane is turned on.
Check the LCD screen for the error
code "trk tlt alarm"
Check screen for error code. It will
display "anti 2 block error."
Check screen for error code. It will
display 100% overload.
Check screen for error code. It will
display "boom psi low."
26
Solution
Verify that nothing had
depressed the button at the time
of movement. If it was not
depressed, replace the
transmitter
Verify there is no damage to the
wiring harness. Verify the
connectors are free of debris and
water
If the arrow stops rotating, shut
power off to the crane for two
minutes before turning the power
back on. If the problem persists,
contact technical support.
Turn on transmitter. Pull e-stop
button out.
Pull e-stop button out.
Most cranes have a toggle switch
to turn on the crane. This is
usually located in the cab or
crane box.
Replace transmitter batteries. It
requires 4 aa batteries.
If the arrow stops rotating, shut
power off to the crane for two
minutes before turning the power
back on. If the problem persists,
contact technical support.
This error occurs when the truck
angle exceeds a 15% slope
(8.5°). Relocate the truck to a
flatter surface.
Verify the traveling block is not
contacting the bail. If hoist down
and check function again. Inspect
end of boom to verify bail is in
contact with anti-2 block switch.
Check bail spring. Check cord
reel and wire on side of crane for
damage.
Verify load on crane does not
exceed moment rating.
Reference load chart. Tap hoist
down or retract function to reset
overload, check operation again.
Verify boom is not supported by
anything except the lift cylinder.
This includes the boom support
on the vehicle.