Agromatic ESR-NK Series, Installation And Operating Manual, Page: 55 / 98

5 Assembly 5.5 Connecting and adjusting the potentiometer (option)
Actuators NK and VK, Position Controller ESR-NK 49
Important information!
Potentiometers may only be operated as voltage dividers (see Fig. 5.18).
Please refer to the schematic diagram inside the hood for information on
the maximum permitted wiper current i
wiper
and the maximum rated power
P
max
of the potentiometer.
Adjusting procedure
An intermediate gear train trans-
fers the positioning range of the
actuator to the electrical angle of
rotation of potentiometer P. A
friction clutch K on the potentiom-
eter shaft protects the potenti-
ometer from being destroyed
during the setting of the actuator.
Fig. 5.19: Adjusting the potentiometer
NOTE
Observe the positioning range of the actuator and the potentiometer
transmission ratio!
The order-specific positioning range must not be exceeded , other-
wise the potentiometer adjustment would be cancelled when moving to
the end position. In this case, feedback of the correct position would no
longer be possible.
1. Set the position limit switches (see section “5.4 Setting the position
switches” ) before adjusting potentiometer P.
2. First move the actuator electrically to the right end position, then to the left
end position. Using friction clutch K, potentiometer P roughly adjusts itself
during this process.
3. Electrically move to both end positions again and check the position of po-
tentiometer 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.
P
K