985.29-1 p.11
5.7 Mounting the drive unit
Before fitting the stepper motor and adjustable coupling, spray the threaded spindle on the stepper motor with slip agent
(Table 5). Then rotate the coupling onto the spindle and adjust the distance to the motor flange (see Figure 10).
Fig 10:
Adjustable coupling – stepper motor flange adjustment measurement
Slide the Venturi insert into the upright body until its mechanical stop and fit the adapter (210). Then mount the
stepper motor with the adjustable coupling. In the process, make sure that the cylinder pin (205) goes through the
hole in the disc (Fig. 8) and the pin runs in the coupling. Fasten the stepper motor with adapter by tightening the
four cylinder screws (214) on the induction elbow. Tighten the threaded pin (Figure 7) and insert the plug (206).
5.8 Adjusting the proximity sensors (limit switches)
Before adjusting the sensors, first screw in the cylinder screw (212) hand-tight into the threaded hole in the adjustable
coupling (spare parts drawing) with the sleeve (213) fitted in the threaded hole provided for this purpose.
Adjust a mixing gap of 0.5
+ 0.1
mm by moving the stepper motor. An adjustment of 0.5 mm takes place with
a control frequency of 20 Hz in full step operation in 5 seconds.
With a change to the control frequency by a factor K, the adjusting time changes
by the factor 1/K.
With a change to the step precision by a factor 1/F, the adjusting time changes
by the factor F.
With an adjustment of both parameters, factors F and 1/K are multiplied.
Adjust the switching point of the “lean” position by screwing in the proximity sensor (208). Screw in the proximity
sensor until the LED on the sensor goes out. Then lock the sensor in its position by tightening the counter nut.
Observe the tightening torque according to the spare parts drawing.
If the device is equipped with two sensors, the switching point for the “rich” position is adjusted first (max. mixing
gap width). For this purpose, increase the mixing gap an additional 4 mm from the "lean" switching point by moving
the stepper motor (total gap width 4.5
+ 0.1
mm). In full step operation the additional adjustment at a 40 Hz step
frequency takes place in 20 seconds. Observe the notice above.
The adjustment of the screw-in position of the proximity sensor, "rich" switching point, takes place analogously to
the adjustment of the "lean" switching point. Then lock the sensor in place here as well by tightening the counter nut.
Note
Caution
!
Observe the adjustment measurement!
Adjustable coupling
Stepper motor