Agromatic ESR-NK Series, Installation And Operating Manual, Page: 59 / 98

Actuators NK and VK, Position Controller ESR-NK 53
6 Electronic position controller ESR-NK
(option)
6.1 Description
The electronic position controller series ESR-NK integrated into the actuator
housing has been designed to regulate the angle position (series NK) and/or
the linear position (series VK) based on a setpoint specification. A potentiom-
eter is used as an actual value encoder.
The setpoint can be specified as a DC current signal 0(4) D 20mA (acc. to
DIN IEC 60381-1) or optionally as a DC voltage signal 0(2) D 10V (acc. to
DIN IEC 60381-2).
In automatic mode the actuator continuously compares the specified position
represented by the setpoint signal with the actual position of the actuator.
If – for example due to a new setpoint specification – the difference between
specified and actual position is large enough, the position controller automat-
ically moves the actuator to the specified position.
Important information!
Limit and auxiliary switches and the potentiometer are not set on delivery!
Depending on the positioning range of the valve, the limit switches and the
potentiometer must be set before they are put into operation:
−
Series NK: 90° (standard), max. 300° (option, depending on the
potentiometer transmission ratio; see section 5.5) at the output shaft
−
Series VK: max. 0° D 180° (see section 5.3.2)
Important information!
On delivery the position controller is not programmed !
To allow the position controller to regulate the position, the actions described
below must be taken before start-up as described in section
“6.2.7 Programming” :
−
programming the end positions of the positioning range, and
−
setting the setpoint range and the direction of action.