Adjustment Of A Safety Threshold And A "Wire Rope Slack" Threshold - Tractel dynasafe Mecha 7 Manuel D'installation, Utilisation Et Maintenance

Adjustment of a safety threshold and a "Wire rope slack" threshold

3.4.
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
Lift the two loads (100 % + 10 %
1
WLL) by about 10 cm.
2 Adjust the safety threshold S1.
3 Check correct operation.
Lift the intermediate load "X" +150
4
daN ( hysteresis)
5 Adjust the intermediate load S2.
6 Check correct operation.
REMARKS
The additional 10 % represents the overshoot value
authorized in accordance with the European
directives.
Gradually screw in the threshold adjustment screws
(§ 2.1, rep G) until the NC contact opens (see § 3.1).
Use an ohmmeter, for example, to check the state of
the contact.
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.).
Wait for the load to stabilize before adjusting the
threshold.
Gradually screw in the threshold adjustment screws
(§ 2.1, rep. G) until the NO contact closes (see §
3.1.).
Use an ohmmeter, for example, to check the state of
the contact.
Check that the micro switch for threshold S2 trips
when the "Wire rope slack" condition is reached.
GB
GB