Woodward ProTech-SX – Panel Mount, HV/LV 8237-1242 8237-1243

The ProTech-SX (“ProTech Simplex”) is a safety PLC

(programmable logic controller) with integrated overspeed

protection designed to safely shut down any plant process

equipment, engine, or steam, gas, or hydro turbine upon

sensing a safety event. This stand-alone safety system

accepts two speed inputs and seven discrete/analog

inputs, uses programmed logic to determine when a

safety event has occurred, then issues system shutdown

commands and alarms. The ProTech-SX uses five fast

acting, configurable relay outputs and a speed meter

output to interface with/command protection to the

specific system or device.

Designed to safely protect high-speed rotating equipment

in system-critical applications, this safety PLC’s total

response time is less than 12 milliseconds.

Programmable inputs and outputs, a 4–20 mA speed

readout, and Modbus® * communications make this

device easy to integrate into any plant, engine, or turbine safety system.

The ProTech-SX is available in a flush-mount model designed to be installed within a panel or

cabinet door located in a control room or on the turbine skid. Designed for harsh environments

when installed within an enclosure, this device has an ingress protection rating of IP56 (protected

against dust and completely protected against jets of water of similar force to heavy seas).

Depending on the model ordered, the ProTech-SX accepts either two high-voltage power

inputs (90–240 VAC / 100–150 VDC) or one high-voltage power input (90–240 VAC / 100–150

VDC) and one low-voltage power input (18–32 VDC). This design works on a high-signal

select basis, allowing the unit to fully operate with either or both power sources available.

*—Modbus is a trademark of Schneider Automation Inc.

Applications

The ProTech-SX safety system is designed to be applied as a safety system for small

engines, steam, gas, or hydro turbines, or related plant systems. This safety PLC’s fast (12

millisecond) response time, 0.5 to 32 000 rpm speed range, and integrated overspeed and

acceleration detection/protection functionality, make it ideal for application on all types and

sizes of turbines or engines.

Alternatively, this stand-alone safety device can be configured to protect any plant system or

device, and report the system’s/device’s status to the plant DCS. The ProTech-SX’s versatile

inputs, outputs, programming environment, and communications make it ideal as a safety

protection device for use in small applications that could possibly reach an unsafe state or

condition and that must communicate directly to the plant DCS.

The ProTech-SX is designed for critical applications where both personnel safety and unit

availability (operation run time) is a concern or necessity. Certified as an IEC61508 SIL-2

(Safety Integrity Level 2) safety device, the ProTech-SX can easily be applied as a stand

alone IEC61508-based device or within an IEC61511-based plant safety system. A thorough

product manual is provided to instruct users on how to apply the ProTech-SX to meet IEC

based requirements.

The ProTech-SX’s high-end functionality, like first-out trip indication, alarm & trip logs, valve

response monitoring, and programmable auto-test routines, coupled with its cost-effective

price, make it useful as a safety device, as a cost effective speed switch (four programmable

relays), or as a valve health monitor.

Interface with related control systems or plant DCS’s

(Distributed Control Systems) can be performed via the

ProTech-SX’s hard-wired inputs and outputs or through its

serial Modbus communication port. Optionally, an Ethernet

gateway can be purchased to easily interface with a plant

Ethernet network.

Functionality

Programming—The ProTech-SX functions as a safety PLC,

as it accepts seven discrete or analog inputs, and allows users

to create custom safety/protection programs to protect site

personnel and equipment. Programmers are able to utilize

typical logic and testing sequence routines to create their

application-specific safety logic and tests.

On-Line Testing—The ProTech-SX can be tested manually

from the module’s front panel, Modbus communications port,

or automatically via its auto-test routine function. The

ProTech-SX allows users to configure overspeed or custom

programmed manual or automatic performance tests.

Trip, Alarm, & Overspeed Logs—The ProTech-SX log

function logs (saves to memory) all trips, alarms, trip valve

response times, and overspeed events. The trip log function

uses a scrolling buffer and records the last 50 sensed trip or

alarm events and the last 20 overspeed events to memory,

with associated times. Each log file is viewed from the unit’s

front panel, or downloaded to a computer via the ProTech-SX

service tool program. Each module utilizes non-volatile

memory to ensure secure capture of all logged events, even on

loss of power.

Trip Valve Health Monitoring—The ProTech-SX can be

configured to test, log, and alarm on the response time of a

turbine trip valve. Using the trooper’s built-in valve response

monitoring function, users can connect a valve position sensor

(limit switch, pressure switch) to a ProTech-SX input and

configure the ProTech-SX to monitor, log, and alarm the period

between sending a trip command and receipt of a valve-closed

indication.

Real Time Clock—Each ProTech-SX utilizes a real-time clock

to ensure accurate time logging. Alternatively, one of the

ProTech-SX inputs can be configured to accept a discrete

clock synchronization input signal from a plant DCS or other

time synch device.