
Manual 35086
ProTech-GII with Math Functions
Woodward
116
Manual Simulated Speed Test
Figure 6-3. Manual Simulated Speed Test Screen Example
Test Mode:
Displays the test mode (MANUAL MODE).
Actual Speed:
Displays sensed actual speed.
Overspeed Trip Setpoint:
Displays the Configured Overspeed Trip setpoint.
This temporarily sets the module’s input speed channel to the module’s internal frequency generator and
sets the frequency to 100 RPM below the configured “Overspeed Trip” level setting. The user then must
manually raise the frequency generator simulated speed via the “Value Up” soft key above the
“Overspeed Trip” setting to cause the Overspeed Trip function to step the module to a trip state. This test
validates operation of the module’s input speed sensing circuitry, overspeed trip function, and output trip
relay.
If the frequency generator simulated speed level is not taken above the module’s “Overspeed Trip” setting
within the configured “Simulated Speed Timeout” time span, this test will be aborted and the module’s
speed sensor input signal will be switched back into the module’s speed channel. NOTE: If the “Simulated
Speed Timeout ” setting is not configured for greater than zero, an immediate timer expiration will
prevent the test from running.
The resolution of the internal frequency generator’s simulated speed signal decreases as frequency
increases. The following table indicates a few spot frequencies. In the following table and graph, it is
assumed that a 60-tooth gear is used with a gear ratio of one, making frequency the same as RPM.
Table 6-1. Simulated Speed Resolution
RPM Resolution
(RPM)
6 9.5E-5
100 .0016
1000 0.16
10000 2.0
32000 20.5
The resolution of the internal frequency generator is described in the following graph. The discontinuities
in the chart occur when different internal clock scaling occurs to optimize resolution.
Released