Replacing The Position Sensor - ABB Contrac PME120AI Instructions Manual

10.3 Replacing the position sensor

10.3.1 Dismounting
- drive actuator into 50% position
- delete the current position setting by pressing the drive buttons on the LCP for at least 5 sec.
- switch-off the voltage supply
- disconnect the connector plug from pcb
- undo the two fastening screws (1) of the position sensor and pull the sensor out of the gears.
10.3.2 Mounting
The toothed gear pair of the position sensor is held in place by a tension spring (3), to ensure sufficient
free motion when the direction of rotation is reversed
- set the stop pin to the center position, as seen in Figure 13
- connect the plug (5) to the PCB
- align the sensor and its gears with the actuator; set the first toothed gear in 11:00 o'clock position
(see Figure 14) onto the drive shaft gear (4)
- slightly move the sensor back and forth to pre-tension the toothed gears with the difference "z"
until the second toothed gear snaps in
- fasten the screws (1) tightly.
1
Fig. 13:
Fig. 15: Connecting the ribbon cable plug to the PCB
After mounting is completed readjust the actuator range as described in section 10 of this manual.
18 Electrical Part Turn Actuators for Continuous Modulating Control PME120AI (Contrac)
Z
2
1
3
(r00329x1)
Position sensor
1
4
(r00335x1)
Fig. 14: Mounting position
5
(r00336x1)
Maintenance
1
A68-2005-003 EN