Siemens 7ML19985AB01 Manuel D’Utilisation
Under low flow conditions, a cut-off head (P45) can be entered to avoid totalizing
flows occurring at or below the flow corresponding to the cut-off head.
flows occurring at or below the flow corresponding to the cut-off head.
LOGGING
The OCM-3 provides an extensive logging feature which can be viewed on the local
display or retrieved via the serial communication link. The logging rate (P39) can be
fixed or variable. The latter being useful in conserving logging space. The condition for
variable logging is determined when selecting the logging rate.
display or retrieved via the serial communication link. The logging rate (P39) can be
fixed or variable. The latter being useful in conserving logging space. The condition for
variable logging is determined when selecting the logging rate.
Variable logging rate conditions are catagorized as : rate of change of flow, percent of
maximum flow or percent of maximum head. Logging occurs at the normal (slower)
rate while the condition is less than the setpoint (P40). If the condition exceeds the log
rapid setpoint, the rapid rate of logging takes effect until the condition falls below the
log normal setpoint (P41).
maximum flow or percent of maximum head. Logging occurs at the normal (slower)
rate while the condition is less than the setpoint (P40). If the condition exceeds the log
rapid setpoint, the rapid rate of logging takes effect until the condition falls below the
log normal setpoint (P41).
The associated setpoint units are : % change of maximum flowrate per minute, % of
maximum flowrate and % of maximum head, respectively. The setpoints represent the
absolute value of the rate of change; that is, for either increasing or decreasing
flowrate. The OCM-3 does not recognize negative entries into P-40 and P-41.
maximum flowrate and % of maximum head, respectively. The setpoints represent the
absolute value of the rate of change; that is, for either increasing or decreasing
flowrate. The OCM-3 does not recognize negative entries into P-40 and P-41.
Flow data is logged in 1/2 % increments from 0 to 110 % of maximum flow. Flows
above 110 % are logged as 110 %. Truncation of flows to 110 % does not apply to
daily totalization.
above 110 % are logged as 110 %. Truncation of flows to 110 % does not apply to
daily totalization.
Log Capacity vs Rates
rate
capacity
1 min
31 days
5
3 months
15
9 months
30
1 year
60
1.5 years
24 hr
2 years
e.g.
15 / 5
9 months max / 3 months min
Once the log is filled, the old data will be successively written over with the new
data being logged.
data being logged.
The log can be examined via F14. Viewing of the log is done by task and by method.
The viewing tasks are: daily flow totals, flow rates and min-max flow data for flow or
temperature. The viewing methods are: by first entry, by last entry and by specified
date. The scrolling keys are used to maneuver through the tasks, methods and
time of day.
The viewing tasks are: daily flow totals, flow rates and min-max flow data for flow or
temperature. The viewing methods are: by first entry, by last entry and by specified
date. The scrolling keys are used to maneuver through the tasks, methods and
time of day.
7ML19985AB01
OCM III
32