ABB MEASUREMENT & ANALYTICS PositionMaster EDP300 Digital Positioner

Compact, well-proven, and
flexible
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High air capacity
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Diagnostics capability
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Resistant to overpressure
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Robust and environmentally ruggedized
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Easy to commission
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Approvals for explosion protection
• ATEX
• IECEx
• cFMus
• EAC TR-CU-012
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Global approval for marine applications
• DNV
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For SIL2 safety loops
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Advanced diagnostics

POSITIONMASTER EDP300 DIGITAL POSITIONER | DS/EDP300-EN REV. J
3
Brief description
The PositionMaster EDP300 is an electronically configurable
positioner with communication capabilities designed for
mounting on pneumatic linear or rotary actuators. It features
a small and compact design, a modular construction, and an
excellent cost-performance ratio.
Fully automatic determination of the control parameters and
adaptation to the positioner allow for considerable time
savings as well as optimum control behavior.
Pneumatics
An I/P module with subsequent pneumatic amplifier is used
to control the pneumatic actuator. The well-proven I/P
module proportionally converts the permanent electrical
setpoint signal from the CPU into a pneumatic signal used to
adjust a 3/3-way valve.
Dosing of the air flow for pressurizing or depressurizing the
actuator is continuously adjusted. As a result, excellent
control results are achieved. When reaching the setpoint, the
3/3-way valve is closed in center position to minimize the air
consumption.
The pneumatic system can be supplied in four versions: for
single acting and double acting actuators and each with the
‘fail-safe’ / ‘fail-freeze’ safety function.
‘Fail-safe’ safety function
If the electric power supply fails, the positioner output 1 is
depressurized and the return spring in the pneumatic
actuator moves the valve to the safe position. In case of a
‘double-acting’ version, output 2 is additionally pressurized.
‘Fail-freeze’ function
If the electric power supply fails, the positioner Output 1
(and Output 2 if applicable) is closed and the pneumatic
actuator blocks the valve in the current position. If the
compressed air supply power fails, the positioner
depressurizes the actuator.
Use
The positioner has a built-in LCD indicator with a multi-line
LCD display and 4 operating buttons for commissioning,
configuration, and monitoring during live operation.
Alternatively, the appropriate DTM/EDD can be used via the
available communication interface.
Communication
The positioner supports HART5® and HART7®
communication.
Inputs / Outputs
In addition to its input for the analog position setpoint, the
positioner is equipped with a digital input which can be used
to activate control system functions in the device. A digital
output allows you to output collective messages (alarms /
faults).
Modular design
The basic model can be enhanced at any time by retrofitting
optional equipment.
Option modules for analog and digital feedback, an
emergency shutdown module, and pressure sensors for valve
diagnostics can be installed.
A module for a universal analog input can also be installed to
which any device supplying a 4 to 20 mA signal can be
connected.
Additionally, a mechanical position indicator, proximity
switches or 24 V microswitches are available for indicating
the position independently of the mother board function.
Diagnostics
The positioner has three optional pressure sensors which can
be used for reliable diagnostics of the valve, the pneumatic
drive, and the positioner.

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