Dwyer 285 - Manual (Page 4)

Installing Series 285 with Bracket
Series 285 is supplied with a standard bracket. The bracket consists of two parts
and is used with a NAMUR shaft. The bracket is assembled in the factory based on
.79˝ (20 mm) of actuator stem height. If the actuator stem height is higher, such as
1.18˝ (30 mm), or 1.97˝ (50 mm), reassemble the bracket adjusting to the actuator
stem height. Refer to the table below to check hole positions.
Ex) If H is 30 mm, A-L should be locked in H:30 hole, B-L in H:20, 30, A-R in H:30,
and H:20, 30 with bolts.
1. Typically, actuator stem heights (H) are .79˝, 1.18˝, and 1.97˝ (20, 30, and 50
mm). After checking H, assemble brackets following previous guidelines. The
bracket is set at .79˝ (20 mm) in the factory.
2. Attach bracket to the actuator using hex bolts. The diameter of the bracket bolt
holes are .24˝ (6 mm). Use spring washers or thread lock compound so the bolts
will not be loosened by vibration or impact. The direction of the bracket varies by
operating conditions, but normal direction is depicted in the following picture. That
is, when the piping of actuator and Series 285 is as shown in direction A, the
bracket hole and indicator attached on the bottom of the Series 285 main shaft
should be mounted in the same direction.
3. Set the rotation position of the actuator stem as the initial zero point, which is 0%
stroke. For a spring return type actuator, the actuator stem is always rotated to the
zero point without supply pressure, making it easy to check the zero point. If the
actuator is double-acting, check whether the rotation direction of the actuator is
clockwise or counter-clockwise, or the rotation direction of the actuator is using
supply pressure.
4. Set the actuator stem as the initial zero point and install a fork lever as showing
in the following picture. Confirm the position of initial zero point when actuator stem
is turned clockwise and counter-clockwise. Installation angle of fork lever should be
about 45 degrees based on the linear shaft. But the angle is not related to NAMUR
shaft.
5.Once the fork lever position is set, lock the check nuts on the bottom of the fork
lever by turning clockwise. Set the upper height of the fork lever to .24˝ to .43˝ (6
to 11 mm) lower than the upper height of the bracket.
6. Attach Series 285 unit to the bracket. Fix the clamping pin on the main shaft
center of the Series 285 into the hole of the fork lever. Insert the connection bar
attached on the main shaft lever into the fork lever slot to be locked by the fork lever
spring. This is to fit the main shaft of the Series 285 to the center of the actuator
stem. If they are not fitted correctly, too much force on the main shaft will greatly
reduce product durability.
7. Attach Series 285 base and the bracket with hex bolts and plate washers. It is
best to lock the bracket and Series 285 together by inserting four bolts after
checking the position.
PIPING CONNECTION
Conditions of Supply Pressure
1. Dry air with a dew point that is at least 50°F (10°C) lower than that of the ambient
temperature.
2. Free from solid particles. Result of being passed through 5 micron or finer filter.
3. Does not contain oil or lubricating oil.
4. Comply with ANSI/ISA-57.3 1975(R1982) or ISA S7.3-1975(R1981).
5. Not used beyond the range of 20 to 100 psi (140 to 700 kPa).
6. Set supply pressure of air filter regulator to 10% higher than operating pressure
of actuator.
Conditions of Pipe
Remove foreign objects from inside of pipe.
Do not use squeezed or broken pipe.
To maintain flow rate of Series 285, use a pipe with inner diameter of greater than
.24˝ (6mm) (outer diameter .39˝ (10 mm)).
20
450
6~11mm
Actuator Stem (H)
Actuator
Direction A
Attachment Direction of Bracket and Actuator
Counter-Clockwise
Clockwise
Bracket
Fork Lever
Actuator
Fitting the Pin on the Series 285 Main Shaft Into Fork Lever Hole
Actuator Stem
Height (H)
20 mm
30 mm
50 mm
B-L
H: 20, 30
H: 20, 30
H: 50 A-L
H: 20
H: 30
H: 50 A-R
H: 20
H: 30
H: 50 B-R
H: 20, 30
H: 20, 30
H: 50
Markings of Bolt Holes
450
1. To prevent ingress of moisture, oil and dust, give careful
consideration to the choice of supply pressure compressor
and piping.
2. It is recommended to attach filter or air filter regulator in front of the supply port
of the Series 285 unit.
NOTICE