User's Manual

GM550 v1043 FCC-IC.doc Revision 2 53
Four Point Lift
The following functions are available for applications such as container cranes and gantry cranes
that require load indication from four load sensors simultaneously.
1. Sum load indication
2. Imbalance
3. Slack Rope
Each of these functions can be used to generate an alarm condition on the lockout wires of the
GS550.
Sum Load Indication
When sum load indication is programmed the sum of the loads on the pre-determined load sensors
is indicated by the operation display. To activate sum load indication program a “Sum load sensor”
in the sensor list. The “id number” is used to identify the load sensors to be summed.
The Sum Maximum Limit
The maximum limit for the sum load can be adjusted in the limit menu; the default maximum limit
for sum load indication is 10000 (lb or kg depending on load display units).
Program Sum Load Indication
Step 1. Press Menu → Next → Next → Next → Enter → Enter to go to the sensor list, menu
page 4A1.
Step 2. Press Next repeatedly to advance to the next available sensor position, usually
following the four load sensors.
Step 3. Determine the sum load cell “id number”. For example: id 1234 to indicate the sum of
load sensors № 1, № 2, № 3, and № 4, or id 34 to indicate the sum of load sensors №
3 and № 4.
Step 4. Use Up and Down to adjust the id number.
Step 5. Press Next.
Step 6. The sensor type should flash; use Up and Down to select the sensor type “Sum load
cell”.
Step 7. Press Enter to save any changes.
Step 8. Press Next to program the imbalance sensor or press Exit three times to return to the
operation display.
Step 9. Adjust the sum maximum limit in the limit menu