TOTALIZER
The totalizer option simply totals
(adds)
input readings together using a
programmable time base and scaling coefficient. The decimal point position of
the totalizer can be programmed independently of the input signal. The totalizer
may be reset through a remote input or by the front panel. Alarms may be
programmed to trigger from totalizer values. The programmable time bases are
“per second”
,
“per minute”
and
“per hour”
, meaning the totalizer will
accumulate at a fixed rate of 2 1/2 times per second and be equal to a fixed input
signal level over the selected time period. For example, if the input signal is a
constant 1000 units and the
“per minute”
time base is selected, the totalizer will
accumulate at the rate of 1000 units per minute. The totalizer is updated at this
rate every 400 msec. As a result, the input signal is accumulated in
“batches”
of
6.6 counts every 400 msec. Therefore, the totalizer start and stop sequencing, as
well as the alarm values set to trigger at specific totalizer values, are accurate only
to the 400 msec totalizer update rate. The preceding example requires a scale
factor of 1.000 to yield exact time bases, but any scale factor can be used to span
between the ranges.
(See section on totalizer programming for detailed
information.)
A programmable low signal level disable feature completes the
totalizer features
(this will stop totalization when the signal level drops below
this programmed value, “low cut”)
. At loss of power to the indicator, the
contents of the totalizer are saved. This will allow totalizing over consecutive
shifts, days, etc. The total can accumulate to 999,999.
Note: The totalizer will roll over and flash when the total exceeds, 999999 or
-9999, indicating an overflow condition.
TOTALIZER EXAMPLE
An IMH is employed to indicate and totalize amp-hours of an electric heater
element. A current transformer with a 5 amp AC output and the proper ratio is
selected
(ex. 50:5)
. The input is scaled to indicate 0.00 to 50.00 amps AC.
Knowing the heater element nominal current draw is 40 amps AC and the
element should be serviced every 8760 amp-hours, the following programming
steps are followed:
TOTALIZER SET-UP
With an average signal input of 40 amps AC for the Process Display, the
following formula applies:
S.F. =
D.T.
x
(
T.B.
)
*
x
D.T.D.P.
I.D.
TIME
I.D.D.P.
S.F. = Programmable Scale Factor
D.T. = Desired Totalizer Value for a
fixed time duration
T.B. = Programmable Time Base
TB = If Program Select Number Chosen Is:
Enter in Formula
“0” for sec.
1
“1” for min.
60
“2” for hr.
3600
I.D. = Input Display Value
TIME = Actual Time period in seconds
D.T.D.P. = Desired Totalizer Decimal Point
Enter in Formula
0
1
0.0
10
0.00
100
0.000
1000
0.0000
10000
I.D.D.P. =
Input Display Decimal Point
Enter in Formula
0
1
0.0
10
0.00
100
0.000
1000
0.0000
10000
-22-
BASIC SCALING
“Pro 2”...“dECPNt”
-
0.00
“round”
-
0.01
“dSP 1”
-
0.00
“INP 1”
-
0.000
“dSP 2”
-
50.00
“INP 2”
-
5.000
TOTALIZER/LINEARIZER/PEAK/VALLEY/TARE
(optional)