Flowserve MX/QX Profibus DP/PA Field Unit - Manual (Page 14)

PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
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2.2.1 MX and QX Actuators
The MX and QX actuators are designed for operation of ON-OFF and modulating valve applications.
The MX is a multi-turn actuator, while the QX is a quarter-turn actuator.
Both the MX and QX include the following features:
• Non-intrusive setup.
• Separately sealed terminal compartment.
• Unique absolute encoder for valve position sensing (no battery required).
• 32-character LCD for indication and calibration.
• Enhanced electronic control, monitoring, and diagnostic capabilities with Built-In Self Test (BIST)
and LimiGard™ technology.
NOTE: Recommended storage procedures are detailed in the MX and QX Maintenance and Spare
Parts Manual LMENIM2314 and LMENIM3314 respectively. Failure to comply with recommended
procedures will void the warranty. For longer-term storage, contact Flowserve for procedure and
recommendations.
2.2.2 MX/QX PB Field Unit
The MX/QX PB field unit interface board is installed in the actuator controls compartment (Figure
2.1). The MX/QX PB DP version is shown in Figure 2.2, and the MX/QX PB PA version is shown in
Figure 2.3. Each unit permits the actuator to be controlled as a slave by one or more master host
stations over their respective PROFIBUS network. The MX/QX PB DP version supports two forms of
redundancy when two PB DP field unit boards are installed in a single actuator:
a. Flying redundancy provides slave hardware redundancy in the form of an active and standby PB
DP field unit installed in each actuator. This form is commonly utilized in applications where a single
master is present.
b. System redundancy provides for both slave hardware redundancy, in the form of an active and
standby PB field unit installed in each actuator, and cable redundancy in the form of dual masters
connected to the active and standby PB DP field units.
Figure 2.2 – MX/QX PB DP Field Unit
Note: Field unit board jumpers, JP1 and JP2, are set to “A” position on Primary board and “B” posi-
tion on Redundant board.