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1010PVNFM-3A
Section 2
To change the default resolution:
To access the [Total Resolution] option list press
Move the cursor to the required resolution press
To store selection press
ENT
2.6.6 TOTALIZER SCALE
After you select [Totalizer Volume Units], the meter automatically computes a prefix to pro-
vide the best combination of capacity and resolution (e.g., MGAL/MIN). The [Totalizer Scale]
menu cell shows the results. If the displayed scaling is not suitable, you can edit it by access-
ing the option list. Note that this scaling applies to all flow total data displayed on the flow
display screen, even if the units do not appear next to the data (because there may not be room
on the screen). Always keep this prefix in mind when you enter totalizer-related data.
To select a different Totalizer Scale:
To access the [Totalizer Scale] option list press
Move the cursor to the desired display scale by pressing
To register selection press
2.6.7 TOTAL RESOLUTION
The meter assigns multiplier prefixes for the flow total units you selected (e.g., MGPM). It
provides three resolution (or capacity) levels. Therefore, actual Totalizer display units de-
pend on the selected multiplier. Check the total units by accessing the Totalizer Scale menu
cell.
If you use the totalizer (TOTCNT) relay output, take into account:
a) The TOTCNT relay output pulses at a maximum rate of 0.5 pulses per sec. (0.5 Hz).
b) The meter sends a totalizer output pulse for every advance of the rightmost visible
totalizer digit.
It is possible for a high flow rate to persist long enough to exceed the relay output’s 0.5 Hz
rate. If this occurs, the meter will store excess pulses in an overflow buffer, and route them
back to the relay when the flow rate drops enough to allow the TOTCNT output to catch-up.
Exceeding the 0.5 Hz rate for long periods could cause an excessive accumulation of buffered
pulses and continue to trip the relay after the flow rate lessens, or even stops. If this occurs,
the meter will be unable to indicate the current flow total. Therefore, select a resolution to
ensure that, even at the maximum expected flow rate, the TOTCNT pulse will not be activated
more than 0.5 times per second for any appreciable length of time. Note that resetting the
Totalizer also clears the overflow buffer.
ENT
Содержание 1010PVDN
Страница 185: ...APPENDIX A Couplant Installation Instructions...