Flowserve BUSwitch with Foundation Fieldbus Communications P Manuel d'utilisateur télécharger pdf (Page 9)

AXENIM0048-01 (Firmware Rev. Nov. 12 99) (AUTO-48) 11/01 Page 9 of 16

ation, Springville, UT

Flowserve Corporation 1350 South Mountain Springs Parkway Phone: 801 489 2233

Flow Control Division Springville, Utah 84663 Facsimile: 801 489 2228

Automation Business Unit www.flowserve.com Email: [email protected]

Automax Valve Automation Systems

Product S

pecification

Transducer Block

The Transducer Block (TB) provides the link between

standard function blocks (DO-1, DO-2, DI-1, DI-2, DI-3 &

DI-4) and the sensors and piezo/coil actuators within the

BUSwitch™ device. It tracks number of valve strokes.

The TB also provides some configuration flexibility.

This section details those parameters affecting the

function and configuration of the BUSwitch device. This

discussion includes all operational aspects of the function

blocks as well. A complete list of TB parameters follows at

the end of the section. Complete function block parameter

lists are provided in Appendices A and B.

Pneumatic Actuator Operation – Single Coil,

Fail Open or Fail Closed

For operation requiring a consistent fail position (either

open or closed), select the “Single Coil” TB.OPERATION

parameter. One DO block (DO-1) is used. The TB reads

DO-1 OUT_D Value and energizes both the OPEN (P6)

and CLOSE (P5) terminals as shown in the Single Coil

Truth Table. To reverse the actuator fail mode for double

acting actuators, reverse ports 2 and 4. To reverse

spring-return actuators, actuator modification is necessary.

Single Coil Truth Table

DO1.OUT_D OPEN/CLOSE

0 De-energized

1 Energized

When in Auto mode, DO1.OUT_D follows the SP_D

Value. If the user wishes to invert the above truth table

relative to SP_D, change the function block IO_OPTS

parameter to “Invert.” This will energize the coil on an

SP_D Discrete 0 and de-energize on an SP_D Discrete 1.

This toggle has the same effect when “dual coil” mode is

selected; it is necessary to select “Invert” for both DO

blocks.

Pneumatic Actuator Operation – Dual Coil,

Fail in Last Position

Select the “Dual Coil” TB.OPERATION parameter. Dual

Coil Operation uses both DO1.OUT_D and DO2.OUT_D

block parameters configured in an interlocking manner.

For valve movement to take place, the OUT_D parameters

must take on opposite values as shown in the next table.

Dual Coil Truth Table

DO1

OUT_D

DO2

OUT_D

CLOSE OPEN

0 0 No Change No Change

1 0 Energized De-energized

1 1 No Change No Change

0 1 De-energized Energized

Referring to Figure 2, energizing the “OPEN” terminals will

provide air to Port 4 and energizing the “CLOSE” terminals

will provide air to Port 2. To reverse the valve operation,

either reverse the solenoid valve wires on P5 and P6, or

reverse the actuator tubing connections on Port 2 and 4.

The TB.OUTPUT_CONFIGURATION parameter selects

whether piezo/coil pilot elements stay energized or

become de-energized after the valve reaches its desired

position. If the “Pulse” option is selected, the elements will

de-energize after the length of time selected in the

TB.TIME_OUT parameter. The “Constant” setting

maintains element voltage until new DO-1 and DO-2

OUT_D values are selected.

Valve Position Monitoring and Reporting

The BUSwitch™ TB monitors the status of two limit

switches. SW1 is the upper switch and is set to trip when

the valve reaches the closed position. SW2 is the lower

switch and is set to trip when the valve is open. The

TB.CLOSED_SWITCH parameter displays SW1 status as

False when not tripped and True when tripped.

TB.OPEN_SWITCH parameter displays SW2 status the

same way.

The BUSwitch permits three user-selectable options for

reporting limit switch status: 1) Feedback through DO-1

and DO-2, 2) “Linkable” feedback through DI-3 and DI-4,

and 3) Digital feedback through DO-1.

Option 1. The TB provides limit switch status to the

READBACK_D parameters of DO-1 and DO-2

respectively per the following truth table.

Truth Table for READBACK_D Values

SW1 SW2 DO-1

RDBK

DO-2

RDBK

Meaning

A A 1 1 Improper switch adj.

A O 1 0 Actuator CLOSED

O A 0 1 Actuator OPENED

O O 0 0 Actuator is moving

A = Activated or Tripped, O = Open or Not Tripped

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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Flowserve BUSwitch with Foundation Fieldbus Communications P Manuel d'utilisateur Page 9

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