Flowserve 3200MD - Manual (Page 23)

User Instructions - Digital Positioner 3200MD LGENIM0059-09 12/13
23
Figure 15: Main PCB Assembly
8.2 Regulator
The regulator reduces the pressure of the incoming supply air to a
level that the driver module can use.
Replacing Regulator
To replace the regulator, refer to Figures 11 and 15 and proceed as
outlined below. The following tools are required:
• Phillips screwdriver
• ¼ " nutdriver
 WARNING: Observe precautions for handling electrostati-
cally sensitive devices.
1. Make sure valve is bypassed or in a safe condition.
2. Disconnect the power and air supply to the unit.
3. Remove the main cover.
4. Remove the plastic board cover by removing the three retaining
screws (See Figure 15).
5. Remove the fi ve wire connections from the main PCB assembly
(six wire connections if the unit is equipped with the 4-20 mA
analog output option).
6. Remove the retaining screw from the main PCB assembly and
lift the main PCB out of the housing.
7. Remove the four screws from the regulator base. Verify that as
regulator is removed, the O-ring and fi lter remain in the counter-
bore (please See Figure 11).
8. Remove tubing and barbed fi tting from the regulator base.
9. Install barbed fi tting and tubing to the new regulator.
10. Verify O-ring and fi lter are in the counterbore. Install new regula-
tor using 8-32 x ½ " screws.
!
NOTE: Do not mix the regulator with those from older Logix
positioners. Older models contain regulators with different set-
tings that will not work in the Logix 3200MD model. The regula-
tor pressure setting is printed on the top of the regulator. The
Logix 3200MD regulator is set to 17.4 psig.
11. Install the main PCB into the housing. Insert the retaining screw
through the board into the threaded boss and tighten evenly,
using a Phillips screwdriver. Do not overtighten.
12. Reinstall the fi ve wire connections (six wire connections if the
unit is equipped with the 4-20 mA analog output option).
13. Install the plastic board cover. Insert the three retaining screws
through the plastic cover into the threaded boss and tighten
evenly, using a Phillips screwdriver. Do not overtighten (See
Figure 15).
14. Reinstall all covers.
8.3 Checking or Setting Internal
Regulator Pressure
To check or set the internal regulator pressure, refer to Figure 16
and proceed as outlined below. The tools and equipment used in the
next procedure are from indicated vendors. The following tools are
required:
• Calibrated pressure gauge (0 to 30 psi)
•
1 ⁄
16
" fl exible tubing
• Barbed Tee (Clippard Minimatic part number T22-2 or equivalent)
•
3 ⁄
32
" Allen wrench
• 3 ⁄
8
" open-end wrench
 WARNING: Observe precautions for handling electrostati-
cally sensitive devices.
Figure 16: Driver Module Regulator Pressure Check
Regulator Pressure
Test Port
Barbed Tee
(Clippard Minimatic
Part No. T22-2)
Flexible Tube
from Regulator
Driver Module
Barbed Fitting
10-32 x " 1 ⁄ 16
1. Make sure the valve is bypassed or in a safe condition.
2. Remove the main cover.
3. Remove the plastic board cover by removing the three retaining
screws.
4. Remove the 1 ⁄
16
" fl exible tubing from the barbed fi tting on the
side of the driver module.
5. Obtain a barbed tee and two pieces of 1 ⁄
16
" fl exible tubing, a few
inches in length each.
6. Position the barbed tee between the internal regulator and the
driver module by connecting the 1 ⁄
16
" fl exible tubing, found in
the positioner, to one side of the barbed tee. Using one of the
new fl exible tubing pieces, connect the barbed tee to the barbed
fi tting on the side of the driver module. Connect the remaining
port on the barbed tee to a 0 to 30 psi pressure gauge.
7. Reconnect the air supply to the positioner and read the internal
regulator pressure on the 0 to 30 psig gauge. The internal
pressure should be set to 17.4 ±0.2 psig. If adjustment is needed,
loosen the set screw retaining nut on the top of the regulator us-
ing the
3 ⁄
8
" open-end wrench. Then adjust the regulator pressure
by turning the set screw on the top of the regulator with the 3 ⁄
32
"
Allen wrench.