GB
2.5.4. Adjustment of a safety threshold and a "Wire rope slack" threshold
This configuration is particularly designed to detect a "Wire rope slack" situation or "presence of a
minimum load" below which the signal generated by the micro switch will be processed, for example,
to stop the down movement of the lifting hook.
Preliminary conditions:
- Load limiter correctly mounted and wired.
- Adjustment screws unscrewed to the maximum.
- Hook free of any load.
Equipment required:
- A load (called "WLL") equivalent to 100 % of the nominal capacity
authorized for the lifting machine.
- An additional load equivalent to 10 % of the "WLL".
- A load "X" equivalent to the value of the "Wire rope slack" threshold.
ACTIONS
REMARKS
1
Lift the two loads
(100 % + 10 % WLL)
by about 10 cm.
The additional 10 % represents the overshoot
value authorized in accordance with the European
directives.
2
Adjust
the safety threshold S1
Gradually screw in the threshold adjustment
screws (§ 2.1 point 06) until the NC contact opens
(see § 2.3. b).
Use an ohmmeter, for example, to check the state
of the contact.
3
Check
correct operation.
It must be possible to lift the "WLL" load.
It must be possible to lift the "WLL" load + 10 %.
Depending on the lifting speed, the dynamic effect
may produce an unintentional overload. In this
case, consult with a technician capable of
integrating a signal filtering device (example: time-
out, etc.).
4
Lift
the load "X".
Wait for the load to stabilize before adjusting
the threshold.
5
Adjust
the “Wire rope slack”
threshold S2
Gradually screw in the threshold adjustment
screws (§ 2.1 point 07) until the NO contact opens
(see § 2.3. b).
Use an ohmmeter, for example, to check the state
of the contact.
6
Check
correct operation.
Check that the micro switch for threshold S2 trips
when the "Wire rope slack" condition is reached.
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