ABB SM1000 User Manual page 74

...4 CONFIGURATION
...4.6.5 Totalizer Configuration
Count rate/Cut-off
Analog Input Sources only – see Section 4.6.1
Count rate/Cut off
Count rate
Cut off
Input Signal
3
3 m /sec
m /hr
150
0.04167
0.0208
75
Area = total
volume of
flow
0
t
1hr
The totalizer pulse rate is
proportional to the input signal.
At this point it is
0.0208 pulses per second
OR
Count rate
Digital Input Sources only – see Section 4.6.1
Input Signal
On
Off
72
0.01, 9999
10.000
0.0
0
Totalizer Value
100.00000
0
t
1minute
Totalizer Value
Set the required totalizer count rate and cut off value.
The Count rate is determined by the maximum number of
engineering units (or pulses) per second and the smallest
totalizer increment:
engineering full scale value (rate)
– to totalize a flow with a maximum rate of
Example
2500 litres/min (= 2.5m
calculation is as follows:
150 m
3600 seconds
The resulting value must be within the range 0.00001 to
99.99999. The totalizer increment is determined by the
number of decimal places in the 'Predetermined count' value
– see page 71.
Units
The totalizer cut off value is the lowest input value (in
2000
engineering units) at which the totalizer is to stop counting.
1000
t
1hr
Set the required totalizer count rate .
A digital totalizer pulse can be scaled to represent a value
between 0.00001 and 1000.00000. The totalizer is then
incremented by this amount each time there is an off/on
transition.
Units
500
– a count of 5 digital pulses with 'Count rate' set to
Example
400
100 increase the totalizer from 0 to 500 in 100 unit steps.
300
200
100
t
1minute
engineering units (in seconds)
3
/min) to the nearest 0.1m
3
/hr
= 0.04167 pulses/second.
3
, the