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Manual 35086
ProTech-GII with Math Functions
Woodward
62
The ProTech-GII derives acceleration from the sensed speed and then compares this 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 ProTech-GII 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 ProTech-GII’s
acceleration detection function can be configured as 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 ProTech-GII Programming and Configuration Tool (PCT). See Overspeed/Acceleration
Log.
Figure 3-10. 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 ProTech-GII models. Independent voted and 2-out-of-3 voted logic is based on
the ProTech-GII’s output voting architecture and not its inputs. If the ProTech-GII’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.
The use of the Speed Redundancy Manager allows users to elect to use three speed sensing probes, or
two speed sensing probes or only one speed sensing probe in each modules’ overspeed logic depending
on the specific application’s requirements. If only two probes are used then the third module can be
configured to only use and vote on the shared speed signals (from the other modules) to use in its
overspeed and over-acceleration detection logic. Although not recommended, if only one probe is used
then the second and third modules can be configured to only use and vote on the shared speed signal
(from the first module) to use in their overspeed and over-acceleration detection logic.
Note
: If a speed probe is not connected to a ProTech-GII module the “Probe type” setting must be
set to “Not Used”.
If the unit is configured for only two probes (or just one probe), there will be a configuration mismatch and
associated alarm. This alarm can be disabled in the Configuration Management Menu.
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
Released
Содержание ProTech-GII
Страница 60: ...Manual 35086 ProTech GII with Math Functions Woodward 58 Figure 3 8 Simplex Trip Block Assembly Released ...
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Страница 194: ...Manual 35086 ProTech GII with Math Functions Woodward 192 Declarations Released ...