Principle Of Operation - ABB EBN861 Operating Instruction

10 EBN853 / EBN861 ELECTRONIC UNIT | OI/EBN853/EBN861/EX-EN REV. C
... 3 Design and function

Principle of operation

The electronic unit builds the interface between the actuator and
the control system.
During continuous positioning, the electronic unit varies the
motor torque continuously until the actuator force and the
control valve force are balanced. High response sensitivity and
high positioning accuracy with short positioning time ensure an
excellent control quality and a long actuator life.
Electronic units are available for assembly in the field near the
actuator, remotely in a mounting rack or for integrated assembly
(smallest actuator type). In addition to the terminals, the
electronic unit contains the microprocessor, frequency converter
for motor control, analog and binary inputs and outputs,
PROFIBUS® or HART® communication interfaces, the
commissioning and service field and a plug connection to
connect a PC.
No matter what the motor power of the respective actuator is,
all electronic units are supplied single-phase by 230 V or 115 V
mains supply (50 Hz or 60 Hz).
The commissioning and service field enables the end positions
and direction of rotation to be set on the actuator. Moreover,
status information is displayed using LEDs. Push buttons can be
used to operate the actuator and set the operating mode
(Automatic, Out of Service).
Change from two to one column