Metso ND9000P User Manual page 18

To monitor pressure values that exceed device specifi-
cations
3.3.3.1.10 Temperature
Temperature trend shows the device temperature on the
Printed Circuit Board (PCB) temperature. You can use
measurement to monitor temperature values exceeding
device specifications.
3.3.3.2 Histograms
3.3.3.2.1 Travel
Use the Travel Histogram trend to determine valve opera-
tion points. You can also use this information to verify valve
sizing. A sample valve travel histogram is shown in figure
23.
Figure 23. Valve travel histogram.
The last bar on the left (-10% - 0%) represents fully closed
position. The last bar on the right (100 – 110%) represents
fully open position.
3.3.3.2.2 Setpoint speed
Setpoint speed histogram shows the speed distribution of
the setpoint from the control system.
3.3.3.2.3 Valve speed upscale
Valve speed histogram shows the speed distribution of the
valve position upscale movements.
3.3.3.2.4 Valve speed downscale
Valve speed histogram shows the speed distribution of the
valve position downscale movements.
3.3.3.3 Travel counters
Counters are basic tools for determining valve operation
level.
Valve travel: This counter increases by 1 whenever
the valve has travelled one full stroke, or 100% of valve
movement.
Valve reversals: This counter increased by 1 when-
ever the direction of valve movement changes.
Actuator travel: This counter increases by 1 whenever
the valve has travelled one full stroke, or 100% of valve
movement.
Actuator reversals: This counter increased by 1
whenever the direction of valve movement changes.
Setpoint travel: This counter increases by 1 whenever
the cumulative setpoint changes.
Setpoint reversals: This counter increases by 1 when
the direction of the setpoint changes.
Spool valve travel: This counter increases by 1 when-
ever the spool has travelled one full stroke, or 100% of
spool movement.
Spool valve reversals: This counter increases by 1
whenever the direction of spool changes.
3.3.3.4 On-line measurements
The on-line measurements window is presented in figure
24.
Figure 24. On-line measurements.
Pressure C1
Pressure measurement from C1 pneumatic connector.
Pressure C2
Pressure measurement from C2 pneumatic connector.
Supply pressure
Supply pressure measurement.
Device temperature
Device temperature measurement.
Total operation time
18(19)