User's Manual

38 LS420 Universal User Manual V2.91 2003-01-21.doc
6.2 The Lock-out Doesn't Engage
Disconnect the yellow
cable from the display
unit and reconnect it
carefully.
Wait 30 seconds and measure the voltage on the white wire.
Is the voltage on the
white wire equal to that
of the crane battery?
Please call your
service representative
The lock-out doesn't engage
Verify the connection of the
white wire of the yellow cable
No
No
Disconnect the white wire from the lock-out circuit
Place the crane
in non-lock-out
condition
Yes
Is the
display in lock-out or
alarm mode?
Verify the voltage on the white wire of the yellow cable.
Is the voltage on the
white wire equal to that of the
crane battery?
Is there a bad connection?
reconnect the
white wire
carefully
No
Is the voltage on the
white wire equal to that of the
crane battery?
Wait 30 seconds
and measure the
voltage on the
white wire.
No
No
The display should be
fine, verify lock-out
function
Yes
Measure current
drawn on white
wire by lock-out
system. Refer to
lock-out section in
the user manual.
Yes
Does lock-out system
draw more than 1A on the
white wire?
Is the
voltage on the
white wire equal to that
of the crane
battery?
Measure the voltage
on the white wire.
Reconnect the white wire to the lock-out circuit
No
Yes
No
Install a relay as
explained in the
lock-out section of
the user manual.
Yes
Yes
Carefully create a lock-out using an A2B switch. If there is
no A2B switch in communication with the display lock-out
may be created by temporarily adjusting a load or angle limit.
Measure the voltage on the white wire of the yellow cable.
Is the voltage
on the white wire
equal to zero?
Everything seems
fine, return any limits
you may have changed
to their appropriate
values and verify
lock-out function
Disconnect the white wire
from the lock-out circuit
Wait 30 seconds and
measure the voltage on
the white wire.
Is the voltage
on the white wire
equal to zero?
Yes
No
Lock-out coils
may be connected to
the positive battery
voltage of the crane
instead of the negative
ground. Verify and
refer to the lock-out
section of the user
manual.
Call customer service
No
Yes
Yes