User's Manual
54 Revision 2 GM550 v1043 FCC-IC.doc
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.
The 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 calculated for each of the four load
sensors and then compared to an adjustable limit. The default imbalance factor limit is 15%.
The 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 (lb or kg
depending on load display units).
Program the Imbalance Sensor
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 and the sum load sensor.
Step 3. The id can be left at 0, press Next.
Step 4. The sensor type should flash; use Up and Down to select the sensor type Imbalance
sensor. Only one imbalance sensor is required to calculate imbalance for all four load
sensors.
Step 5. Press Enter to save any changes.
Step 6. Press Exit three times to return to the operation display.
Step 7. Confirm the imbalance factor limit and the imbalance minimum limit in the limit menu.
How it Works
Load № 1 Imbalance Factor = 100 x
Average (Load 2, 3, and 4) – Load 1
Average (Load 2, 3, and 4)
Example: Imbalance factor calculation for load sensor № 1
A 7500 B 8100
C 8000 D 8200
Load № 1 (A)
Imbalance Factor
= 100 X
8100 – 7500
8100
= 7.5 %
Example: If the imbalance factor limit is 15%, then the system is safe.
A 6800 B 8100
C 8000 D 8200
Load № 1 (A)
Imbalance Factor
= 100 X
8100 – 6800
8100
= 16 %
Example: If the imbalance factor limit is 15%, then an imbalance alarm is generated.