Commissioning
ETH Mounting Instructions
32
192-550002N10 ETH March 2019
2.3.2.4
Re-apply toothed belt pre-tension (reinsert the same
toothed belt, all ETH sizes)
ETH032 ... ETH080
If the motor / gearbox is exchanged and the toothed belt is still in good condition,
the pre-tension can be reset without measuring device.
Remove the upper cover, please refer to Figure 19 Pos 6
First check whether the toothed belt with its
toothing is located in the upper and lower pulley.
Screw in the screws (please refer to Figure 27
Pos.7) without torque, so that the drive unit can
be lifted upwards
Recommendation:
Screw in the screws
completely and then loosen again about half a
turn.
Tighten central toothed belt tensioning screw
(please refer toFigure 19 Pos.12).
The drive unit must lift when tightening the
screw. Lift the unit until it touches the 2 internal
stops (please refer to Figure 19 Pos. 10). This is
made by tightening the central tightening screw.
Figure 27: Screws for fixation of drive
unit ETH032...ETH080
Tighten 4 screws (please refer to Figure 27 Pos.7) with the given tightening
torque (please refer to Table 3).
Refix both lids (please refer to Figure 19 Pos.4 & 6) with the respective screws
(please refer to Figure 19 Pos.11 & 9).
ETH100&125
The ETH100&125 electro cylinder is furnished with tensioned belt. When
dismantling the gearbox / motor, the belt must
NOT
be detensioned. Therefore, this
chapter is usually not valid for the ETH100&125.
Screw tightening torques belt tensioning option
ETH032
ETH050
ETH080
ETH100
ETH125
3 Nm
5 Nm
20 Nm
70 Nm
115 Nm
Table 3: Screw tightening torques belt tensioning option
2.3.2.5
Re-adjust toothed belt pretension (new toothed belt,
all ETH sizes)
After installing a new toothed belt, the toothed belt pre-tension must be readjusted.
Make sure that the screws
ETH032…ETH080: see Figure 27, Pos 7
ETH100 & ETH125; see Figure 28, Pos7 are provided
with a medium strength screw lock (e.g. type Wiko
02K43) and are fully screwed in. Only screw in screws
without torque, do not tighten completely:
Recommendation: Screw in the screws completely and
then loosen again about half a turn.
ETH032…ETH080: For this sizes, the motor/ gearbox is
already mounted.
ETH100 & ETH125: For this sizes, the motor/ gearbox
can be installed after belt tensioning. Furthermore, it mus
be take care the the lower bearing cover is already
mounted (see Figure 38 Pos 3, screws Pos 1 with
medium strength screw locking, eg type Wiko 02K43).
Figure 28: Screws for fixation
of drive unit ETH100 &
ETH125
Check, if the belt toothing is geared into the upper and lower toothed pulley.
