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Date: 2017-10-24
Re-calibrating overload
Warning! Re-calibrating the overload affects safety mechanisms of the winch.
Violation of the maximum overload can cause a dangerous situation with risk of
serious injury or death.
The winch is set to enter overload mode if the winch is loaded with more than the
nominal load. The overload is a safety feature to ensure that the winch cannot lift
more than what is safe.
The overload detection is based on the motor current which is affected by the
effectiveness of the gear. As the gear’s effectiveness changes with usage, the overload
may need re-calibrating.
It is therefore essential to control that the overload is correct at regular inspections.
The overload can be re-calibrated to lower values as follows:
1.
Ensure at least 1.5 m clearance below the winch
2.
Load the winch with the desired overload threshold 10% (max 11kg total)
3.
Set the DMX channels to 999
Attention! When setting the mode to 9, the winch will start moving
4.
Then set mode to 9
The winch will now run down a number of times. When the winch has moved back to
the soft TOP limit the overload has been re-calibrated.
Ensure to change the DMX channel and MODE away from 999 and 9 after re-calibration.
Synchronized movements of multiple winches
If several winches are installed to perform synchronized movements the best result is
achieved by using a fading 16 bit position. The winches have a slight deviation in
performance of the motors, so some motors have a slightly higher maximum speed
than others.
This difference in speed can be solved by running the winches with fading positions,
like when fading conventional light over time, the position of the winch should be
faded from one position to another over a certain amount of time. In that way the
winches will follow the fade-curve, and multiple winches can follow the same fade
curve.
When fading the positions:
1.
The speed channel should be a set to 100 to gain the highest possible speed.
2.
The position channel should be assigned as a 16 bit channel with MSB and LSB.
3.
The speed of the fade needs to be slower than the maximum speed, so the
motors have speed enough to follow the fade-curve.
If the fade of the positions is too fast, the winches will move at the maximum speed,
and you will see the difference in the motor speed.
If the fade is to slow the winches will move – stop – move – stop, when the position
changes, thus giving a discontinuous movement.
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