Tractel HF 32/2/A, Operating And Maintenance Manual

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MS 32/2/A R 03/03
6
OPERATION AND ADJUSTMENT OF HF 32/2/A LOAD CELL
The switching power is 4A, 220 Vac (0.3A, 250 Vdc). ( It is therefore possible to
connect in series in the upper limit switch circuit).
Adjustment of the safety trip point
Essential conditions : - The load cell must be correctly installed and wired.
- The hook of the lifting system should be free of any load.
Equipment required : - A load (“Pm”) equivalent to 100 % of the working load limit
of the lifting system .
- An additional load equivalent to 10 % of « Pm ».
ACTION EXPLANATION
1 Lift the two loads
(100% + 10% of Pm)
by +/- 10 cm.
The additional 10 % load represents the overload value
permitted under the European directives.
If an overload situation is detected in the wire rope ( without
lifting the loads) the preadjustment of the load cell in the
factory is too low for your lifting system.
Solution: release the tare screw (F - see fig. 4) one turn at a
time and restart at the beginning of point 1.
2 To adjust the safety
trip point.
Use the tare screw (F).
Warning : incorrect adjustment may damage the circuit –
breaker.
Do not forget the locking nut (G). The switch is a normally
closed contact (NC), requiring the opening of the switch to set
off an overload condition.
Turn clockwise to reduce the value of the trip point.
Turn anticlockwise to increase the value of the trip point
(Black)
Alarm
Control
voltage
Lifting
Contactor
G
Brown)
(Blue)
BROWN/BLUE = NC (Normally closed)
BROWN/BLACK = NO (Normally open)
Earth
Fig. 4