Exchange Of Position Sensor; Dismounting; Mounting - ABB LME620AI Service Instruction

7

Exchange of position sensor

7.1

Dismounting

- drive actuator into 50% position
- delete the current position settings by pressing the drive buttons
sec.
- switch-off the voltage supply
- disconnect the main plug
- undo the four fastening screws (1) of the pin strip carrier and push the carrier aside
- undo the two fastening screws (2) of the position sensor, pull the sensor out of the gears
- disconnect the plug of the signal cable on the sensor pcb
7.2

Mounting

The toothed gear pair of the position sensor is held in place by a tension spring (3), to ensure a back-
lash-free contact when the direction of rotation is reversed
- set the stop pin to the center position, as seen in figure 23
- align the sensor and its gears with the actuator; set the first toothed gear in approx. 12:00 o'clock
position (see fig. 24) onto the drive shaft gear (4)
- slightly move the sensor back and forth to pre-tension the toothed gears until the second toothed
gear snaps in
- fasten the screws (2) tightly.
Fig. 23: Position sensor
Finally provide a new basic setting of the actuator operating range. See the Set Up chapter in the ac-
tuator and / or electronic unit manual for details.
43/68-13 EN Electrical Linear Actuators for Continuous Modulating Control LME620AI / LME620AN (Contrac)
3 (d0181rxa)
Fig. 24: Mounting position
Exchange of position sensor
2
1
and
on the LCP for at least 5
(68d_0048)
19