LK LD Series, User Instruction

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7. No sudden reverse
Do not use the up-down button frequently. (see the
picture 24)
It increase more than the double weight in an instant,
shortens the life of the body and the road chain
extremely
Reference
* If repeated instantaneous load against load chain is
bellow certain level, fatigue brake is not happened and
if repeated instantaneous load against load chain is
bellow certain level, fatigue brake can be happened
(see figure 25)
As long as goes through sufficient test and proof load,
the load chain is designed well enough for certain
volumed load. For example, the chain durability and
lifting speed is set up in proper way. However, over
load still cause fatigue brake.
* As a load chain shock loaded, load chain tension
waves short cycles; a little shock is always loaded to a
load chain (see picture26)
* If there is shock in a row, it can easily cause a
sudden large tension because of duplicated tension.
* No matter the tension change of a load chain can be
controled in seconds, there can be a large and sudden
tension on a load chain because it shocked when
reduction of tension change is not enough for sudden
reverse operation.
* Do not sudden reverse operation as an electric chain
hoist is loaded more than 60% of proof load.
*It it is necessary to do sudden reverse operation with
certain load (let's say PKg), should operate 1.7*PKg
electric chain hoist at the least.