Woodward-Service Bulletin 01671

Service Bulletin 01671

ProTech GII, TPS, and MSM

User Configuration Guidance

Issue

ProTech GII, TPS, and MSM controls support a variety of configuration options. When using

Active speed probe sensors, certain configurations could lead to a lapse in overspeed protection,

if multiple faults occur in the system comprised of the ProTech, field wiring and speed sensors.

Description

The ProTech GII, TPS and MSM are fault tolerant safety control devices that are fully configured

by customers for each unique site application.  These products have many functional options

available and the system is designed to continually provide its primary function, even when one

fault occurs anywhere in the ProTech system.

It has come to our attention that some user configurations of these products, may not react as

expected when a second fault occurs in the ProTech system.

These safety products are all configurable by the user, so it is important to emphasize the

following points:

• On any configurable device – it is possible to have a valid configuration that may not do all

that is expected, verification of customer and installers requirements and unit testing at site

commissioning is required to ensure the appropriate response to faults in the system.

• On any fault tolerant system, a single fault should be investigated and addressed.  Depending

on the configuration, running the system in a prolonged mode with an active alarm, leaves it

in a state where a second fault could cause a trip or prevent the unit from performing its

primary function.

If your configuration settings utilize one of the following features, this Service Bulletin can be

disregarded:

1. Probe Type: PASSIVE (such as MPU’s)

2. Speed Fail Trip: USED

If your configuration settings are using Active probes (not MPU’s) and your configuration has Speed Fail Trip

set to “NOT USED” follow the instructions in the Corrective Action section below.

All units shipped with the following part numbers:

GII

TPS

MSM

8237-1244 8237-1248 8237-1252

8237-1245 8237-1249 8237-1253

8237-1246 8237-1250 8237-1254

8237-1247 8237-1251 8237-1255

8237-1367 8237-1371 8237-1375

8237-1368 8237-1372 8237-1376

8237-1369 8237-1373 8237-1377

8237-1370 8237-1374 8237-1378

8237-1594 8237-1602 8237-1492

8237-1595 8237-1603 8237-1493

8237-1596 8237-1604 8237-1494

8237-1597 8237-1605 8237-1495

8237-1598 8237-1606 8237-1496

8237-1599 8237-1607 8237-1497

8237-1600 8237-1608 8237-1498

8237-1601 8237-1609 8237-1499

8237-1660 8237-2602 8237-2492

8237-2594 8237-2603 8237-2493

8237-2595 8237-2604 8237-2494

8237-2596 8237-2605 8237-2495

8237-2597 8237-2606 8237-2496

8237-2598 8237-2607 8237-2497

8237-2599 8237-2608 8237-2498

8237-2600 8237-2609 8237-2499

8237-2601 8237-2614

Potentially affected ProTech units may have also shipped as sub-components of other Woodward

cabinets, kits and systems. Specific customer sales order details are provided by the appropriate

Woodward Customer Service Representative.

If you are currently using configurations described above then at your earliest convenience, plan

to modify your unit configuration with the following recommendations.

It is recommended that on ProTech GII products, the option Speed Fail Trip always be set to

“USED” whenever the configuration of the speed input probe type is “Active”.

It is recommended that on ProTech TPS or MSM products, the option Speed Fail Trip always be

set to “Used” whenever the configuration of the speed input probe type is “Active”. If this is not

desired, due to a need to have other Safety Instrumented Functions (SIF) protected in all 3

kernels, then use the “Speed Redundancy Management” option and configure both “Base

Function” and “Fallback Function” to be HSS.

To review their ProTech configuration and compare it with the information in this bulletin to see if

any of these potential problem conditions are possible.

We suggest that customers with units that are currently in operation, to verify that they are not

running with active module alarm conditions that could lead to a potential issue.