Woodward ProTech TPS, Product Manual

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Manual 26710V1 ProTechTPS Total Protection System
Woodward 55
Module-to-Module Communications
An isolated communications bus is used between modules to:

Share module input signals and event latch status information

Copy an application program from one module to another module

Compare module application programs for differences

Verify the health and state of the other modules before allowing a module
test to be performed

Pass a “module test token” between modules when performing a “Periodic
Overspeed Test” routine
Product Models
Two basic ProTechTPS models are available depending on the required system
architecture and related output signal(s).

The ProTechTPS “Independent Trip Relay” models consist of three
independent modules that each accept one speed input and ten configurable
analog/discrete inputs, then output two redundant trip commands.

The ProTechTPS “Voted Trip Relay” models consist of three independent
modules that each accept one speed input and 10 configurable
analog/discrete inputs, and whose trip output commands are then voted in a
2-out-of-3 fashion to create the 2-out-of-3 trip output command.
Both of these models can be purchased with different mounting options
(bulkhead mount or panel mount) and different input power supply options (two
high-voltage power supply inputs or one high-voltage and one low-voltage power
supply input). Each ProTechTPS model can be configured to function for
energize-to-trip and de-energize-to-trip applications. The de-energize-to-trip
functionality is implemented such that a complete loss of power to the module
results in a trip of that module. The energize-to-trip functionality is implemented
such that a complete loss of power to the module does not result in a trip of that
module.
Optionally all ProTechTPS models can be configured for de-energize-
to-trip or energize-to-trip functionality based on the application
action required. However, de-energize to trip is a safer way to fail so
that a total power loss to the control will trip the prime mover.
ProTechTPS with “Independent Trip Relay” Outputs
ProTechTPS “Independent Trip Relay” models consist of three independent
modules that each accept one speed input and ten configurable analog/discrete
inputs, then output two redundant trip commands. The trip command outputs are
electrically separated, allowing each module to actuate a separate external relay
or trip solenoid. These models are typically used with special 2-out-of-3 voted trip
block assemblies or 2-out-of-3 voted trip string relay logic.