Accessories - Item Lre 5 D6 60X20 Zu 40 R10 Handbuch

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If the Linear Unit LRE 5 D6 60x20 ZU 40 R10 has been supplied fully
preassembled, you will need to check the pre-tensioning against the order
specifications. After a running-in time of 24 hrs, check the operating tension of
the Timing Belt again and adjust it if necessary.
When tensioning the Timing Belt, first identify the zero point at which the
untightened Belt has no sag at all and pre-tensioning begins. To do that, draw
the moving part of the Tensioning Block towards its fixed counterpart by alter-
nately tightening the tensioning screws. Calculate the necessary tensioning
adjustment or elongation of the Timing Belt according to the operating load of
the Linear Unit.
Conventional calculation:
Following applies: F + F < F
P x Bperm
and: F > F
P x
Where: F = m x a+ m x g +F
x B
Where: ΔL = Tensioning adjustment [mm]
L = Total Timing Belt length [mm]
F = Pre-tensioning force for Timing Belt [N]
P
F = Permissible force for Timing Belt [N] = 300 N
Bperm
F = Operating load [N]
x
T = Frictional torque, loss of friction when running light
F
[Nm] = 0.2 Nm
r = Effective radius [mm] = 22.28 mm
E
C = Constant of expansion [N] = 75 N
The calculated tensioning adjustment can be checked by various means.
Typical tools include frequency analysis tools, strain gauges and simple length
measuring devices.
Tip:
The necessary elongation calculated for the Timing Belt is constant along its
full length.
The actual elongation of the Timing Belt as calculated for this segment can
be checked and thus adjusted by marking a specific length on the Timing Belt
(e.g. 1 m) and using a steel ruler.

Accessories

The Proximity-Switch Fastening Set can be used to position and secure
inductive Proximity Switches for homing positions and electric terminal position
limits in the system groove of Timing-Belt Reverse Unit 5 40 R10. The Proximity
Limit-Switch Holders D6.5, D8 and D12 can be attached with anti-torsion
blocks either parallel or at right-angles to the Profile 5 or Profile 8 groove.
Fasten Limit-Switch Holders D6.5, D8 and D12 in place with a Hexagon
Socket Head Cap Screw DIN 912-M4, spring washer and T-Slot Nut for the
corresponding Line.
10
L��F
_______
V
ΔL =
1000��K
Similar to the picture, which is purely an example to illustrate the measure-
ment principle.
Switch fixings must be shortened as appropriate to the application scenario.