ABB MEASUREMENT & ANALYTICS PositionMaster EDP300 Digital Positioner

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