Maeda MC815C, Operation Manual, Page: 127 / 426

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[2] MOMENT LIMITER ERROR MESSAGE DISPLAY
The moment limiter is equipped with a self- diagnostic function at its display section in order to
detect the occurrence of an abnormality, such as disconnection of wires or connectors, failure in
the boom angle, boom length gauge, or in the pressure sensor.
The moment limiter notifies the operator of the detected results by using error codes, which are
displayed on the monitor.
If any error code is displayed, immediately stop the use of the crane.
For details about the error codes and troubleshooting, refer to “OPERATION 11.7 LIST OF
ERROR CODES”.
1.5.3 MOMENT LIMITER OPERATION
The moment limiter is a device that is provided for measures available in an emergency case. In
actual fact, any operations relying on the device may incur danger.
Pay sufficient attention during operations so that the crane will not stop automatically.
[1] PROHIBITED OPERATIONS AFTER AUTOMATIC STOP
If the crane has stopped automatically due to overload, the following crane operations
are prohibited.
Disobeying this rule may cause critical danger due to tipping of the machine or
breakage of the boom, for example.
• Boom lowering • Boom raising • Boom extension • Hook winding • Crane slewing
[2] RECOVERY OPERATION FROM AUTOMATIC STOP
1. For a load capacity ratio: Less than 90 %
The normal green revolving lights stays on as long as the
lifting load falls within 90 % of the Rated Total Load.
2. For a load capacity ratio: 90 to less than 100 %
In the case of lifting loads being 90 % (warning alarm) of
the Rated Total Load, the illuminated green revolving lights
turn yellow, and an alarm goes off intermittently to notify
operators or people around that the lifting load is
approaching the Rated Total Load.
3. For a load capacity ratio: Higher than 100 %
If a lifting load exceeds 90 % (warning alarm) of the Rated
Total Load and becomes higher than 100 % after repeated
crane operations, the illuminated yellow revolving lights
turns red and a alarm goes off constantly, causing the
following crane operations to stop automatically.
• Hook winding • Boom extension
• Boom lowering • Boom raising