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PSS EVE0105 E-(en) SRD991 3

OVERVIEW

The SRD991 consists of a basic device with a digital controller that supports different communication protocols

(or also simply 4-20 mA input). Into this basic device, additional equipment can be built such as plug-in cards for

electrical input/output signals, position feedback and pressure sensors.

The pneumatic part is available in different versions (single / double acting or spool valve). For very large

actuators, boosters with increased air capacity can be flanged on. Also, different manifolds for connection of gauges

can be flanged on. For the pneumatic screw connections we offer different threads in the housing and adapters.

For use in hazardous areas there are approvals according to ATEX, FM, CSA ...

The device can be configured locally by means of push buttons and LCD / LED, or with PC + EDC82 Modem

connected to the service plug of the SRD991. By means of communication the device can be configured remotely via

FDT/DTM.

A large variety of attachment kits for all common valves and actuators are available. The list “AttachmentKits.pdf” is

updated continuously and can be found on the Internet here

For high temperature or high vibration application, we recommend to mount the SRD991 remotely and not directly

on the valve. For this, use the potentiometer unit (like the SRI990 - TXQxxxxx - H).

Please consult TI EVE0105_R

for specifications.

To ensure the high performance of the positioner, we offer Advanced Diagnostics and Premium Diagnostics utilities:

Premium Diagnostics Advanced Diagnostics

Autostart Yes Yes

Custom Characterization Yes Yes

Autodiagnostic Yes Yes

Alarm Management Yes Yes

Alarm Output for Switching (with Optionboard) Yes Yes

Status List acc. NE107 Yes Yes

Position History Yes Yes

Response History Yes Yes

On Line Friction Yes

Stepping Signature Yes

Ramping Signature Yes

Sensitivity Signature Yes

Valve Signature Yes

PST (Partial Stroke Test) Yes

PST Predictive Maintenance Yes

Additional equipment, built into the basic device:

Option Board “2 Binary Inputs” or B

2 external switches (supplied by SRD) release a control function in the

SRD, e.g. "close valve" (configurable)

Option Board “2 Binary Outputs” or

2 binary outputs (to be supplied externally) become active during value

limit in excess of the measured valve position

Option Board “2 Binary Inputs/Outputs” or

2 channels, each configurable as an input or output

(to be supplied externally)

Option Board “Position Feedback” F

1 output 4-20 mA (to be supplied externally) gives stroke / angle of rotation,

1 alarm output becomes active with a configurable event

Limit switch

T,U,

R,V

Supplies NAMUR signals when exceeding or falling below of two limit

values. Inductive sensors, independent of the controller,

in normal or safety version or three-wire, or micro switches

D Entry for remote potentiometer of external potentiometer unit

Pressure sensors

2 sensors measure the pressure of supply air and output y1 for Premi

um Diagnostics; the values are passed on via communication

LCD Full text graphic LCD in 3 languages

Accessories like Manifolds and Boosters see page 24.

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