NATIONAL CRANE
Published 11-01-2020 Control # 710-00
7-13
NBT60XL OPERATOR MANUAL
RATED CAPACITY LIMITER
7
Accessing Operating Mode Screen
Use this procedure to access the Operating Mode screen.
The Operating Status key
appears only after the
RCL configuration and set-up is complete. The Operating
Status icon configuration shows current approximate
percentage of load capacity. Table 7-5 shows the different
meanings of the Operating Status icon.
The Operating Status icon appears only if a valid RCL
configuration has been entered. For more information setting
RCL configuration, see “RCL Setup” on page 7-8. The image
on the button displays the real-time Rated Capacity Bar
Graphics status.
To access the operating mode screen:
•
Press the
function key.
Activating the TARE Function
The TARE function calculates the net weight of the load
(Total Load – Hook Block). The TARE function must be
activated before lifting.
To use the TARE function:
1.
Rig the load to the hook block.
2.
Before lifting the load, press the TARE function.
3.
Lift the Load. The net load is shown in the actual number
display.
The TARE button icon flashes blue in color when active.
Changing the boom angle or length automatically returns the
actual load display back to the total weight (Load + Hook
Block).
Overriding the RCL System
Two mechanical key switches in the crane cab can be used
to override the RCL system. The key switch on the console
temporarily overrides the RCL system so long as the key is
turned. The key switch behind the operator’s seat overrides
the RCL system for as long as the key is in the ON (Override)
position. For more information, see “RCL Override Switches”
on page 3-13.
OPERATIONAL LIMITS
The operator sets operational limits to restrict crane
operation to a defined area. The operational limit icons are
displayed in the warning cluster on the RCL Operating Mode
screen. These icons flash and a buzzer sounds when the
operator violates the limits.
NOTE:
Crane functions are not disabled when the
operational limit extents are reached.
Accessing the Operational Limits Screen
To access operational limits:
•
Select the LIMIT function key on the RCL Operating
Mode screen.
The RCL Limits Menu screen appears.
RCL Limits Menu
Select the desired operational limit 1 through 6. Use the
arrow key to scroll back and forth to select the correct
operational limit.
Table 7-6 shows the selections on the Operational limits
screen.
Table 7-5 Operating Status Icon Meanings
Status
Description
Approximately less than or equal to 50% of
capacity.
Approximately greater than 51% and less
than or equal to 75% of capacity.
Approximately great than or equal to 76% of
capacity.
Indicates that the user is in an Override
condition. For more information about
override conditions.
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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Reference
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