LML0012-0 8/99 Page 1 of 6
©1999, Flowserve Corporation, Provo, Utah
Flowserve Corporation
Flow Control Division
Automax BUSwitch
– Profibus-DP
765 South 100 East
Provo, Utah 84606
www.flowserve.com
Phone: 801 373 3028
Facsimile: 801 489 2228
Installation, Operating & Maintenance Instructions
Electronic Printed Circuit
Board Specifications
Power requirements
†
XA0231 Profibus-DP
Interface Card
24 VDC
- 675 mA max with
solenoid activated.
Temperature
Operational
-40 °F to +185 °F
(-40 °C to +85 °C)
Storage
-40 °F to +250 °F
(-40 °C to +120 °C)
† To operate, an external 24 VDC source must be locally
supplied to the interface card.
Profibus
Information
Manufacturer
ID 0867 (Hex)
Device
GSD File AMAX0867.GSD
Firmware
Revision
1.13
Transmission
Speed
12 MBaud maximum
GSD file supplied on diskette included with every
device.
Principles of Operation
Flowserve’s BUSwitch is a valve automation and
control product that uses the Profibus-DP
communication protocol to operate and monitor
position as well as provide predictive and
preventative maintenance functions. In response to
a command from the operator, the BUSwitch
energizes the appropriate solenoid valve, which
shifts a spool valve, directing the pneumatic force to
the appropriate actuator port, thereby operating the
valve actuator.
For single coil operation, the
solenoid coil is mounted internal to the BUSwitch
housing to protect it from the environment. A 4-way
spool valve is bolted externally to the housing. The
fail direction of the actuator can be established
based on which set of terminals (open or closed) the
solenoid coil is connected to. For dual coil
operation, externally mounted solenoid valves must
be used as the housing will not accommodate two
internal coils. Upon reception of an open or close
command, a timer is started whose value is
compared to a user-defined setpoint for that
particular operation. If this timer value exceeds the
setpoint, an alarm is sent back to the control
operator to indicate a possible problem exists at the
valve. In addition, an odometer counter totals the
number of transitions the valve has made, which is
then compared to a user-defined limit. If this limit is
exceeded an indication is sent back to the control
operator. The odometer limit can be reset by the
control operator after maintenance has been
performed. During operation the valve status (open,
closed or in-transit) is continuously available to the
control operator. The Profibus-DP Interface Board
(XA0231) requires 24 VDC at 175 mA maximum.
Current consumption with a solenoid activated will
be the sum of the solenoid current plus 175 mA.
Mechanical Installation
Installation is best performed with Flowserve
NAMUR mounting kits. These kits allow direct
mounting of the BUSwitch shaft to the actuator
pinion without a coupler. The NAMUR mounting kits
will work with any actuator conforming to the
NAMUR standard for accessory mounting hole
locations and pinion dimensions. Simply attach the
bracket to actuator and BUSwitch to the bracket with
the included fasteners. The BUSwitch shaft features
an integral alignment pin that engages the tapped
pinion hole. Flowserve also offers a full line of non-
NAMUR kits.
Spool and Tubing Configuration
1. For spring return actuators, a 4-way spool valve
is provided with port #2 plugged. For double
acting actuators, the same valve is provided with
no plugs. Make sure the correct spool is
selected before installing tubing. (Note: the
Flowserve APS2 purge module can be supplied
on spring return actuators to purge the spring
chamber with supply air.)
2. Make sure all air pressure is removed before
installing tubing.
3. Attach tubing according to Figures 1 or 2 below,
depending upon application. Attach supply
tubing to Port 1 and use 3 and 5 for exhaust.
4. To prolong actuator life use only clean, dry plant
air. Lubricated air is not required, although it is
recommended, particularly for high cycle
applications.
(12 pages)
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