AUTOMATIC GROSS OVERLOAD PROTECTION
MAN-1111 Rev H
©Copyright 2015 LSI-Robway Pty Ltd
Page 151
RCI-4100 AUTOMATIC GROSS OVERLOAD PROTECTION
An Automatic Gross Overload Protection (AGOP) option is available for LSI-Robway RCI-4100
Rated Capacity Indicator systems. The AGOP output is triggered when the maximum SWL is
exceeded by a predetermined percentage and several other confirming conditions are met for
arming AGOP.
The system features are:
•
Tension-based Main and Auxiliary load calculation
•
AMBER AGOP Armed indicator provided to Operator
•
RED AGOP Active indicator provided to Operator
•
Onboard / Personnel Lift / Offboard duty selector knob for Operator
•
Duty selector switch provides a redundant set of contacts to physically disconnect the
AGOP output signal when either Personnel Lift or On-board Duty is selected
•
Slew zone switch closed when crane slews offboard
•
Slew switch provides a redundant means of disabling the AGOP output signal when the
crane is slewing in an onboard slew zone.
•
Absolute value encoder used both as a restricted slew zone control and as a redundant
slew value to back up the slew proximity switch.
•
Maximum Luff RAM pressure table versus boom angle to validate the load data.
THEORY OF OPERATION
The LSI-Robway AGOP system uses a combination of hardware interlocks and software checks to
prevent the unwanted release of a load suspended in an on-board condition, i.e. release is
prevented over the deck of the platform (on-board), and at all times during a personnel lift. Several
conditions must be met in order for the LSI-Robway system to output an AGOP Active output.
These are:
a) Duty Selector knob in “OFF-BOARD” position.
b) On-board / off-board slew proxy closed (closed = off-board)
c) Absolute encoder indicating off-board position.
d) Hoist-rope tension exceeding SWL by a predetermined percentage e.g. 150%
e) Overload condition validated by luffing RAM pressures indicating an overload condition
based upon customer-supplied maximum pressure versus boom-angle charts.
f) Short time-delay exceeded after all conditions met to filter out transient signals.
Optional AGOP system features are:
g) Hook height below deck monitoring
h) Constant tension controls in winches (manufacturer provided)
i) Proximity siren warning of Active AGOP
Hardware Interlocks
The following prevents an AGOP trigger regardless of the RCI-4100 controller state:
1. Duty Selector rotary switch in operator console NOT set to “Off-board” duty.
2. Slew Proxy switch on-board and/or slew proxy switch circuit OPEN.
Summary of Contents for RCI-4100
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