Henning GmbH & Co. KG
page 35
19/02/2019
7.A.3 Rope Adjustment
Generally, the sensors should be mounted in the section of the rope which features maxi-
mum lengths without intermediate deflections or traction sheaves, as the ropes will be bal-
ancing out only very slightly or none at all during standstill.
If this is not possible due to the layout of the elevator, several rope settings may be carried
out in succession. In between the adjustment procedures, the elevator should be driven
several times in order to compensate the ropes loads across the traction sheave.
7.A.4 Friction / Determination of Weight
Due to heavy friction of the car or the counterweight in the guide rails the measuring
result may be negatively affected. In such a case it is prefered to determine the weight
during a constant travel. This effect is found particularly often in the case of rucksack
guides. With roller guides this effect is found generally less frequently than with slide
type guides.
If possible, clamp the sensors onto the rope directly above the load to be measured (>= 200
mm) and subsequently travel a short distance upward with constant speed. If there is no
difference between the indicated load during the constant travel and while standing still,
there is no friction to speak of in the guides and it will not be necessary to carry out the
measurement during travel.
If there is a significant difference between the travel and the standstill value, make a note
of the value measured during the upward travel and then start a downward travel with con-
stant speed. Make a note of this value too.
The average of the readings obtained during upward and downward travel is the real
weight without friction.
By this trick of traveling upwards and downwards and the subsequent determination of an
average value you have eliminated the dynamic and static friction of the elevator from the
measurements.
!
Attention: In the case of multi-suspensions, please take extra special care that the
sensors are not overrun during the measuring travels!
