User's Manual

39 LS420 Universal User Manual V2.91 2003-01-21.doc
6.3 The Display Unit Is Always In Alarm Mode, The "2 Block" warning
light is on
6.4 The Display Unit Is Always In Alarm Mode, the main hoist green
light is flashing
Yes
Place all A2B
switches in
safe condition.
No
The anti-two-block switch
appears to be working properly,
please refer to the lockout
section of the user manual.
Yes
Press the "Test" button.
Are A2B
batteries low?
No
Take the A2B
switch off the
cable. Pull
on the wire
rope.
Does the red
light on the A2B switch
flash after pulling on the
wire rope?
Yes
There
appears to be a
communication
problem, see
diagnostic
mode p. ?
Yes
The batteries
need changing.
Refer to the
changing anti-two-
block batteries
section of the
user manual.
No
Reinstall the batteries, carefully inspect
the battery and plunger cavities for
infiltration of water or dirt. Refer to the
changing batteries section of the user
manual.
Pull on the wire rope.
Does the red light on
the A2B switch flash after pulling on
the wire rope?
Yes
Reinstall the A2B
switch on the cable.
Verify A2B function.
No
Please call your
service representative
Is the
"2 Block"
warning
light still
on?
Yes
The load cell failsafe
warning is on. On
startup this is normal as
the load cell may take up
to fifteen minutes to
communicate its battery
status to the display unit,
until which time the
failsafe warning will
sound.
Are load cell batteries low?
Verify battery installation or
change batteries if necessary,
see the changing load cell
batteries of the user manual.
Yes
No
Verify
communication
between the load
cell and the display
unit (follow the
procedure).
Press the "Test" button to verify battery status.
The display is always in alarm mode,
the "2 Block" warning light is on?
The display is always in alarm mode,
the main hoist green light is on?