ABB TZIDC Manual page 15

TZIDC DIGITAL POSITIONER | CI/TZIDC/ATEX/IECEX-EN REV. C
5. Secure the mount bracket
using the relevant tap holes on the positioner housing.
 Tighten the screws as evenly as possible to ensure
subsequent linearity. Align the mount bracket in the oblong
hole to ensure that the operating range is symmetrical (lever
moves between the arrow marks
Figure 9: Mounting on a cast iron yoke
1. Attach the mount bracket
to the cast iron yoke
1
or
Figure 10: Mounting on a columnar yoke
1. Hold the mount bracket
columnar yoke .
2
2. Insert the U-bolts from the inside of the columnar yoke
1
through the holes of the mount bracket.
3. Add the washers and nuts
4
 Tighten the nuts so that they are hand-tight.
with screws and washers
1 2
).
4
with screw and washer
2 4
.
in the proper position on the
3
.
5
Note
3
Adjust the height of the positioner on the cast iron yoke or
columnar yoke until the lever is horizontal (based on a visual
check) at half stroke of the valve.
1 Increase linkage
Figure 11: Positioner linkage
The scale on the lever indicates the link points for the various
stroke ranges of the valve.
Move the bolt with the follower pin in the oblong hole of the
lever to adjust the stroke range of the valve to the working range
3
for the position sensor.
Moving the link point inwards increases the rotation angle of the
sensor. Moving the link point outwards reduces the rotation
angle of the sensor.
Adjust the actuator stroke to make use of as large an angle of
rotation as possible (symmetrical around the center position) on
the position sensor.
Recommended range for linear actuators:
• −28 to 28°
Minimum angle:
• 25°
Note
After mounting, check whether the positioner is operating within
the measuring range.
2
2 Decrease linkage
15