Flowserve 1400 Valtek Logix - Manual (Page 8)

46-8 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Collector Board
The collector board assembly provides a central routing
for all electronic connections in the positioner, linking the
pressure modulator coil, hall effect sensor and field
inputs to the main electronics. The collector board
assembly also serves as a mounting for the pressure
sensors used on the advanced model of the positioner.
Removing Collector Board (Figure 19)
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 and disconnect the wiring to
the collector board. Each cable has its own unique
connector to prevent mistakes in reconnecting.
4. Remove the three No. 8-32 screws holding the
collector board to the housing.
5. Remove the collector board.
Replacing/Upgrading Collector Board
1. For the advanced collector board (Logix 1x1x),
check that pressures sensors are in place on back
of collector board. For the standard model (Logix
1x0x), make sure the adapter block is securely
fastened to the collector board.
2. Make sure the O-rings are in place in the counterbores
of the pressure ports.
3. Set collector board assembly in place.
4. Insert three No. 8-32 screws through collector boards
into the threaded holes on sensor shelf and standoff.
5. Tighten all three screws.
6. Connect the main ribbon from electronics tray.
7. Reconnect wiring to the collector board.
Field Terminations
The field terminations board provides a connection point
inside the explosion-proof housing for all hookups to the
positioner. While the board is not likely to experience a
failure, it can easily be replaced to upgrade the positioner.
Replacing Field Terminations Board
(Figure 19)
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 and disconnect the field
termination cable from collector board.
4. Remove the field terminations cover and the three
No. 8-32 screws.
5. Remove field terminations board, carefully pulling
wiring through bore.
6. Verify that the O-ring is in place in the counter bore
in the positioner housing.
7. Feed wiring through passageway into main chamber
of housing.
8. Set the circuit board in place and secure with three
No. 8-32 screws.
9. Connect field termination cable to collector board.
Stem Position Sensor
The position feedback assembly transmits valve posi-
tion information to the processor by means of a rotary
position sensor that connects to the valve stem through
a feedback linkage. The follower arm is biased against
one side of the slot with a rotary spring to provide
accurate tracking of the pin in the slot. This spring also
automatically moves the position feedback assembly to
its limit in the unlikely event of failure of any component
in the linkage.
Stem Position Sensor Replacement
(Figure 9)
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 and disconnect rotary posi-
tion sensor wires from collector board.
4. Remove the two screws from the rotary position
sensor, taking care not to lose the washers, and
remove the sensor from the housing.
5. Turn position sensor shaft until the dot on the slot is
aligned with the wires on the pot (Figure 9).
6. Insert the position sensor into the shaft with the
wires pointing toward the main PCB assembly. Turn
position sensor clockwise until the bolting slots align
with the housing screw holes and the wires on the
sensor protrude over the main PCB assembly tray.
7. Carefully center the position sensor on the shaft
bore, insert and tighten the screws. Do not over
tighten.
8. Route wires along the position sensor and reconnect
to collector board.
Stem Position Sensor
Housing
Sensor Cable
Feedback
Shaft
Figure 9:
Stem Position Sensor Orientation
Rotate Stem Position
Sensor
slowly
Bearing
Stem Position Sensor Dot