EP100 Master Instruction
13
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D00002-C-04
7.2 Setting of direction of rotation
of feedback shaft
If the actuator moves from starting to end position,
the direction of rotation of the feedback shaft is to
the right or left hand, depending on the mounting
method of the positioner selected and on the
configuration of the actuator (spring closes/ opens/
double-acting).
For proper functioning this direction of rotation
must be set at positioner (via switches 1+2).
The direction of rotation is defined as direction of
rotation of the feedback shaft from the starting to
the end position looking at the positioner from the
front. See following illustration (shown is: left hand
mounting, spring closes, direction of rotation L).
Direction of rotation of feedback shaft for a rotary
actuator:
Actuator opens
rotating to the left
Actuator opens
rotating to the right
L
R
Direction of rotation of feedback shaft of the double-acting
actuator is a. o. determined by the mounting side and the
tubing of the pneumatic outputs to the actuator. It has to be
considered that in a powerless EP100 the output y1 will
become pressureless and y2 contains air supply pressure.
The direction of rotation of the feedback shaft is set via
switches 1+2; see the following illustration.
L:
left-hand rotating feedback shaft
switch 1+2 on “I”
R:
right-hand rotating feedback shaftt:
switch 1+2 on “II”
Remarks:
If the direction of rotation is not in the right manner, the
actuator moves to the end position with full force, and the
positioner cannot be controlled.
Definitions
Stroke
stroke range of the membrane actuator is
defined for rotary actuator as angle, angle
range.
0 % position
is the mechanical impact at actually closed
valve (caution if using handwheel and
mechanically adjustable stroke limitation!)
100 % position
is the mechanical impact at actually open
valve.
