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Frequency Input Blending Controller – Frequency Flow, DCV Control
The 515-CB01 application is a blending controller measuring the blending flow a in main and process line using frequency flow inputs.
The blending controller can operate in PRESET, ON-OFF (manual) and RELEASE mode of operation. The latest mode allows for easier tuning of the control loop.
The main and process flows are used to determine the net volume flow. The operator can view the ratio of totals as well as the ratio of flowrates.
The control of the process flow is via a digital control valve. The flowrate deadband and control responsiveness can be adjusted to reduce wear on valves.
Calculations
Blend Point Location.
The controller caters for blending points before and after the main flowmeter. The process flow is a ratio of the net (combined) flow (o-80% range):
• Pflow Ratio% = —————- × 100 Netflow
During the delivery the ratio setpoint is modified to cater for the flush volume:
• Preset SP ratio (mod.) = P ratio —————- Preset – Flush
Features
Tailored for volumetric frequency flow input
Pump demand contact
Selection of various modes of operation
Process line control via DCV (digital control valve)
Remote PERMISSIVE input to control delivery’s state
PRESET and FLUSH volume parameters to automatically adjust radio setpoint
Allows for non-linear correction
Storage of 1000 transactions with time and date stamp
Selection of second language and user tags
Selectable protocols on serial ports including Modbus RTU and Printer output
Backlit display with LCD backup Typical plant diagram
Downloads
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