ProTechTPS Total Protection System
Manual 26710V1
76
Woodward
Temporary Overspeed Setpoint
This feature temporarily replaces the Overspeed Trip setpoint with a different
value for testing. This test mode can be applied to all three modules
simultaneously. The Temporary Overspeed Setpoint can be higher or lower than
the normal overspeed trip setting.
When the Temporary Overspeed Setpoint is set above the normal
overspeed trip, it should not be set above the maximum speed
allowed for the unit.
The Temporary Overspeed Setpoint is designed to allow users to easily test the
module’s overspeed function at a level lower than the normal overspeed setting
or to test the overspeed function of a mechanical bolt or other overspeed
protection system at a higher speed than the electronic overspeed trip setting.
An alarm is generated when this test is enabled. Also, there is a Temporary
Overspeed Trip Timeout feature that prevents an operator from “forgetting” to
disable this test. The timeout can be configured from 0 to 30 minutes. When the
test is enabled the timer starts, if it reaches the timeout value, the test is
automatically aborted.
Once the module is in its tripped state, this test is disabled and the module’s
overspeed setpoint is returned to its normal setting.
Simulated Speed Tests
There are three tests that use an internally generated speed signal to test a
modules overspeed trip setpoint and trip output function. The ProTechTPS is
defaulted to use the highest level Test Mode Permissive so that a module cannot
be placed in test while any other unit is tripped, in test, or in alarm. If it is desired
to test a unit trip by tripping multiple modules through these simulated speed
tests, the Test Mode Permissive can be set to a lower level.
Manual Simulated Speed Test
This allows the user to manually increase/decrease a modules’ internal
frequency generator to perform a test of the overspeed trip function of that
module. This test can only be performed from the front panel of the ProTechTPS.
When the test is initiated, the frequency generator automatically starts at 100 rpm
below the overspeed setpoint. Then the operator can adjust the simulated speed
up or down from the front panel of the ProTechTPS.
When the overspeed trip occurs, it is logged in the modules’ trip log and noted as a test.
An alarm is generated while this test is enabled. Also, there is a Simulated Speed
Timeout feature that prevents an operator from “forgetting” to disable this test.
The timeout can be configured from 0 to 30 minutes. When the test is enabled
the timer starts, if it reaches the timeout value, the test is automatically aborted.
The operator can abort the test at any time.
Auto Simulated Speed Test
This test allows users to easily test the module’s overspeed trip function by
having the module’s frequency generator automatically ramp up to and above the
module’s overspeed set point. This can be initiated from the front panel or via
Modbus. The auto test starts at 100 rpm below setpoint. Then the frequency
generator ramps up at approximately 10 rpm/s until the overspeed trip occurs.
