ABB COMMANDER 1900 Series, Руководство пользователя

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13
…4.1 Introduction to Totalization
Example A – setting up:
• engineering range of 0 to 2500 representing a range of 0 to 250,000 gallons per hour
• filling a storage tank with a capacity of 500,000 gallons
• least significant digit of 1 gallon shown on totalizer display (viewed in
Totals Page
,
OPERATOR LEVEL
)
• wrap function off, 1 second wrap pulse generated at predetermined value and combined in a logic equation to stop flow.
4 ADVANCED CONFIGURATION LEVEL…
• Totalization
Engineering Range
(Display Range)
Wrap On/Off
2500
0
Preset Value
Predetermined
Value
Preset/Predetermined
Count
Count Up
0050
0000
0000
0000
Count Rate
High/Low
CNt–HI
069.4
CNt–LO
000.0
Count
Direction
Preset Value
Predetermined
Value
Count Up
Wrap Off
Stop Flow and
Counting at
500,000
Start Counting
at 0
Set up in
Set Up Input (PV)
,
BASIC CONFIGURATION LEVEL
✶
See
Engineering
Flow Rate High
Engineering
Flow Rate Low
Set up in
Set Up Input (PV)
,
BASIC CONFIGURATION LEVEL
Engineering Range
(Display Range)
Wrap On/Off
2500
0
Preset Value
Predetermine
d Value
Preset/Predetermine
d Count
Count Up
9999
0000
0000
Count Rate
High/Low
CNt–HI
06.94
CNt–LO
0000
Count
Direction
Preset Value
Predetermine
d Value
Count Up
Wrap On
Reset to 0 when
99,999,999 reached
Start Counting
at 0
Engineering
Flow Rate High
Engineering
Flow Rate Low
✶
See
9999
Units/Second = = 69.4 gallons/second
Count Rate (High) = = 69.4 pulses/second
Example B – setting up:
• engineering range of 0 to 2500 representing a range of 0 to 2,500,000 gallons per hour
• measuring effluent discharge
• last significant digit of 100 gallons shown on totalizer display (viewed in
Totals Page
,
OPERATOR LEVEL
)
• wrap function on, front panel total automatically reset to 0 and continues counting when predetermined value is reached.
250,000
3,600 (in seconds)
69.4
1
Units/Second = = 694.4 gallons/second
Count Rate (High) = = 6.94 pulses/second
Note. For the majority of applications the
Count Rate Low
is set to 0000 . Only if the engineering Flow Rate Low is not
to zero, is it necessary to calculate the Count Rate Low setting, e.g. when the resultant flow range of several flows added
together always ensures a minimum flow is greater than zero.
2,500,000
3,600
694.4
100