National Crane Published 9-26-2018 Control # 646-02 7-5
NTC55 OPERATOR MANUAL RATED CAPACITY LIMITER
• Horn Silence - Indicates the RCL warning horn is
temporarily disabled for a period of 15 seconds per
push. The horn silence button icon will be shaded when
active.
• Slew Angle Limit - The slew angle is measured
from the centerline of the bearing with the boom in the
boom rest to the present boom position. This is to alert
the operator of a user set limit.
A positive slew angle is to the right side of the boom rest
+.1
0
to +360
0
or +.1° > angle > 180° negative slew angle
is to the drivers side of the boom rest from -0.0° to -180°.
• Tip Height Limit - The tip height is measured from
the ground to the tip of the boom. This monitors the
height of the boom tip to alert the operator of a user set
limit (assumes maximum outrigger deployment).
• RCL Angle Limit - The angle limit is measured by
the boom angle. This is to alert the operator of user
defined limits above or below these settings.
• Radius Limit - The radius limit is measured from
the center of rotation to the center of the load. This is to
alert the operator of a user set limit.
• RCL WADS Limit - The work area definition
(WADS) limit is measured as a straight line from point A
to point B anywhere in the work area. This sets up a
virtual wall that alerts the operator of a user set limit. The
WADS can be configured with three virtual walls.
• General Warning - refer to MAIN Menu option 3
“Diagnostics” screen to see the warning that is active.
• Joystick - Active settings of one or more of the
joysticks, current setting lower than 100%.
• O/R Setup Overridden - Shown to indicate that the
operator has manually overridden the sensor data of the
current outrigger configuration. This is NOT an RCL
lockout condition so no buzzer sounds or functions are
disabled.
• Over Rear Operating Mode - Shown when
crane is currently in the Over the Rear load chart mode.
If the crane is within the EEPROM value range for Over
the Rear, the GREEN icon is shown. If the crane is within
10° of inside limits of these EEPROM values, the icon is
yellow. See Figure 7-4.
• CWT Removal Slew Position - Shown to indicate
that the operator is approaching (YELLOW) region
where the CWT slab(s) can be pinned to the turret/box.
See Figure 7-4.
DANGER
Use extreme caution when operating the crane with the
RCL system overridden. Use of the RCL system override
to operate the crane in a non-permissible range can result
in death or injury to personnel and/or damage to
equipment and property.
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