36 The GS550 System
• Imbalance
• Slack Rope
These functions can be used to generate an alarm condition on the lockout wires of the GS550.
2.8.1 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.
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.
1. Press Menu, and then Next three times.
2. Press Enter twice to go to the sensor list, menu page 4A1.
3. Press Next repeatedly to advance to the next available sensor position, usually follow-
ing the four load sensors.
4. 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.
5. Use Up and Down to adjust the id number.
6. Press Next.
7. The sensor type should flash; use Up and Down to select the sensor type “Sum load
cell”.
8. Press Enter to save any changes.
9. Press Next to program the imbalance sensor or press Exit three times to return to the
operation display.
10. Adjust the sum maximum limit in the limit menu
2.8.2 Imbalance
Systems programmed for four load sensors and four load sum indication can be programmed with
an imbalance sensor to warn against uneven load distribution or against unwanted rope payout if
one corner of the load touches down before the others.
Imbalance factor limit. The imbalance factor is the percent difference between the load on
one load sensor and the average load on the other three. The imbalance factor is calcu-
lated for each of the four load sensors and then compared to an adjustable limit. The de-
fault imbalance factor limit is 15%.
Imbalance minimum limit. Imbalance is not calculated when the four load sum is below
the imbalance minimum limit. Adjust this limit to avoid generating an imbalance alarm under
minimum load conditions (for example: with an empty container or with rigging only). The
default imbalance minimum limit is 1000 (pounds or kilograms depending on load display
units).
Program the imbalance sensor.
1. Press Menu, and then Next three times.
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