Agromatic ESR-NK Series, Installation And Operating Manual, Page: 66 / 98

6.2 Electrical connection 6 Electronic position controller ESR-NK (option)
60 Actuators NK and VK, Position Controller ESR-NK
6.2.4 Setting the limit switches and the potentiometer
Before
–
the limit switches are adjusted,
–
the potentiometer is adjusted,
sliding switch Auto/Manu must be set to the
position OFF = manual mode !
Setting the position limit switches
1. Move the actuator to the left end position of the valve using buttons L and
R . The valve must not block the actuator in this position!
2. Turn control cam NL in the rotational direction of control shaft W until limit
switch SL switches over (identified by an audible click within the switch).
3. For CW rotation, set control cam NR for the right end position of the valve
as described in steps 1 and 2.
4. To check the correct positions, move to both end positions again electri-
cally using buttons L and R , and re-adjust the control cams where re-
quired.
Adjusting the potentiometer
By moving again to both end positions as described in step 4, potentiometer
P is roughly adjusted via friction clutch K (also see section
“5.5 Connecting
and adjusting the potentiometer (option)” ).
5. Move once again to the two end positions using buttons L and R , and
check the position of potentiometer P at each end position:
−
The potentiometer may not reach its mechanical stop in either end
position.
−
Re-adjust the potentiometer using friction clutch K where required.