Flowserve Pulsair III Digital - Manual (Page 3)

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Worcester Controls Pulsair III Digital Electronic Positioner FCD WCAIM2056-00 - 08/04
fl owserve.com
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Worcester Controls Pulsair III Digital Electronic Positioner FCD WCAIM2056-00 - 08/04
1 Introduction
The PULSAIR III is a digital positioner designed primarily for controlling modulation
valves.
The positioner can be used with single- or double-action actuators with either rotary or
linear movement.
The PULSAIR III can be equipped with modules for feedback, limit switches, and a
pressure gauge block.
The modules can be factory-assembled before delivery or fi tted later.
The modules for feedback and limit switches can contain 4-20 mA feedback and one of
the following functions:
• Two mechanical switches
• Two reed switches
• Two inductive sensors
Safety notices are presented in this manual in three forms:
a Warning: Refers to personal safety. Alerts the user to potential danger. Failure to
follow warning notices could result in personal injury or death.
c Caution: Directs the user’s attention to general precautions that, if not followed,
could result in personal injury and/or equipment damage.
NOTE: Highlights information critical to the user’s understanding of the actuator’s instal-
lation and operation.
Safety Instruction
Read the safety instructions in this manual carefully before using the product. The
installation, operation, and maintenance of the product must be done by staff with the
necessary training and experience. If any questions arise during installation, contact the
supplier/sales offi ce before continuing work.
a Warning:
• The valve package moves when in operation and can cause personal injury or damage
if handled incorrectly.
• If the input signal fails or is turned off, the valve moves quickly to its end position.
• If the compressed air supply fails or is turned off, fast movements can occur.
• The valve is not controlled by the input signals when in the “Out of service” mode. It
will open/close in the event of a leak.
• If a high value is set for Cut off, fast movements can occur.
• If the valve is controlled in the Manual mode, the valve can move quickly.
• Incorrect settings can cause self-oscillation, which can lead to damage.
Important:
• Always turn off the compressed air supply before removing or disconnecting the air
supply or the integral fi lter. Remove or disconnect with care because C- is still under
pressure even after the air supply is turned off.
• Always work in an ESD protected area when servicing the PCBs. Make sure the input
signal is switched off.
• The air supply must be free from moisture, water, oil and particles.
2 Storage
General
The PULSAIR III positioner is a precision instrument. Therefore, it is essential that it is
handled and stored in the correct way. Always follow the instructions below!
NOTE: As soon as the positioner is connected and started, an internal air leakage will
provide protection against corrosion and prevent the ingress of moisture. For this
reason, the air supply pressure should always be kept on.