GIS GP limit switch packages and adjustments

Limit switch packages

As standard, the electric chain hoist is equipped with a built-in geared limit switch. It allows very precise upper and lower limit positions.

The operation of the limit switch (the highest and lowest hook position) must be checked during commissioning. Three different transmission gear sets are available, selected according to the lifting height:

• Before pulling in or replacing the chain, the geared limit switch must be mechanically disengaged by pressing the rocker switch (1).
• The chain is pulled in.
• Drive the hook to the highest position and turn the red switching wheel (2, rear) to the switching cam of the upper limit switch (3) (lower hook position clockwise, higher hook position counterclockwise).
• Check the rocker switch (1) (it must lock into the switching wheel).
• Drive the hook to the lowest position, press the rocker switch (1) and turn the green switching wheel (4, front) to the switching cam of the lower limit switch (5) (lower hook position clockwise, higher hook position counterclockwise).
• Check the rocker switch (1) (it must lock into the switching wheel).

The gear ratio of the chain hoist’s limit switch can be changed by replacing the gears. In practice, the larger the gear ratio, the less precise the limit position is in relative terms. For smaller lifting heights, it makes sense to use the smallest possible gear ratio, so the limit can be adjusted as precisely as possible to a specific point. The table below shows the gear colours and the maximum lifting heights at the extreme positions.