Manual 26710V1
ProTechTPS Total Protection System
Woodward
69
Overspeed and Over-Acceleration Detection and Trip
Each ProTechTPS includes overspeed and over-acceleration functionality and
can be custom configured to meet specific application overspeed and over-
acceleration requirements. No custom application program is required to be
loaded for this functionality to operate normally.
The ProTechTPS senses speed and then compares the sensed or voted speed
to its programmed overspeed trip setpoint to detect an overspeed condition and
generate a trip command.
The ProTechTPS derives acceleration from the sensed speed and then
compares the sensed acceleration to its programmed over-acceleration trip
setpoint to detect an over-acceleration condition and generate a trip command.
With the configuration of the acceleration redundancy manager each
ProTechTPS module uses the acceleration values from all three modules to
select/vote the acceleration value to compare to the configured over-acceleration
trip setpoint and detect an over-acceleration condition. The ProTechTPS
control’s acceleration detection function can be configured to be enabled,
disabled, or only enabled above a certain speed setpoint. The over-acceleration
trip range is configurable from 0 to 25 000 RPM/s.
Peak speed and peak acceleration are tracked and logged for every overspeed
and over-acceleration occurrence. The last 20 occurrences are logged and can
be viewed from the front panel or loaded to a computer via the ProTechTPS
Programming and Configuration Tool (PCT).
Figure 3-13. Over-Acceleration Enabling Diagram
Speed Redundancy Manager
The configuration/use of the Speed Redundancy Manager is not required to use
either the independent voted or 2-out-of-3 voted ProTechTPS models.
Independent voted and 2-out-of-3 voted logic is based on the ProTechTPS’s
output voting architecture and not its inputs. If the ProTechTPS’s speed
redundancy manager is not configured for use, then each module simply uses its
local speed sensor signal and compares it to its internal/local overspeed setpoint
to determine an overspeed event.
Overspeed Setting
(110%)
High Acceleration Enable
setting
(0 rpm to Overspeed rpm)
Rated Speed
(100%)
Turbine Speed Rate of Increase
(rpm/second)
0
500
Max Turbine
Acceleration Setting
Trip Area
Trip Area