Belden Hirschmann HC4900 - 6. LMI System Functions; 6.1 Warning Conditions; 6.2 Prohibited Movements

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6. LMI System functions
6.1 Warning
Under any below conditions, HC4900 LMI system will light up and send out
alarm for warning.
 The crane is overload or exceed operating range
 The hook approaching height limitation
 Malfunction
6.2 Prohibition
If a fault occurs, the LMI system will send alarm warning and all of the following
crane’s movements will be prohibited:
 Boom luffing down
 Telescope out
 Hoist up
At this moment only the movements toward safe direction are allowed:
 Boom luffing up
 Boom retract
 Hoist down
When the cut-off device is activated this cut-off signal will always keep
be out. Functions such as “dangerous direction operation is not allowed”,
“only safe direction operation is allowed” is realized by cooperating with
the crane’s electronics system which including “ safe direction inspect
switch”, “safe overflow solenoid valve” etc. The LMI system cannot judge
the operation is safe or dangerous itself.
CAUTION