K-Patents SeedMaster 2 - Manual (Page 32)

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Change feed syrup purity
If instead of a single one, 2 or 3 (maximum) feed syrups having different syrup purities are to be fed to the same
batch strike the device must be informed on the execution of the change. This can be done by:
Selecting MANUAL OPERATIONS from the MENU followed by CHANGE FSYRUP and CHANGE. The operation
will step the feed syrup number to the next one (from 1 to 2, then to the maximum 3). (For more information on
feed syrup changes see: 3.6.3).
If a level transmitter is connected to the SeedMaster 2, using SETUP -> INPUTS -> FEED SYR. PUR up to 3
different purities and 2 level threshold data (where the change of purity should be made) can be selected from the
keyboard to implement automatic change of feed syrup purity.
If a level transmitter is connected to the SeedMaster 2 up to 3 different purities and 2 level thresholds can be sent
via COMMUNICATION to implement automatic change of feed syrup purity.
Finally, level, purity and level threshold data can all be sent via COMMUNICATION to implement automatic
change of feed syrup purity.
5.2 SeedMaster 2: TRANSMITTER features
Besides providing all the features of an advanced OPERATOR STATION on site for the local operator,
SeedMaster 2 was designed to serve at the same time the needs of a Process Control System (PCS) as an
INTELLIGENT REMOTE TRANSMITTER.
5.2.1 Analog output
Selected measured and calculated data can be transmitted using the standard current outputs of
SeedMaster 2 (see Ch. 4, Fig. 4. 7). Specifications:
Standard current:
4 – 20 mA, or 0 – 20 mA (configurable)
Type of output: individual galvanic isolation
Load: 600 ohm max.
Number of outputs: 2x4
5.2.2 Digital data communication
SeedMaster 2 has advanced digital data communication features under the common name:
“COMMUNICATION”. It consists of
• 3 communication ports (COM1, COM2, COM3) with configurable standard (RS232, RS422, RS485)
features (protocols served: “K-PATENTS refractometer (PR-01-S)” and MODBUS SLAVE (ASCII,
RTU)), and
• 1 ETHERNET port (protocols: TCP / IP, MODBUS TCP and UDP / IP (“K-PATENTS refractometer
(PR-23-…)”.
By using advanced data communication it is possible to fill all of the two-way information flow requirements
between SeedMaster 2 and any type of computer or control system with a compatible network connection.
Details of the procedures are described in Chapter 11.
5.3 SeedMaster 2: SEEDING features
Seeding is a very critical operation which has a large effect on the final product parameters (see Ch. 2). It is
therefore highly recommended to make effective use of the AUTOMATIC SEEDING feature available with
SeedMaster 2.
Success of the seeding, however, depends on something else, too. It is natural that before opening the
seeding valve the seeding vessel must be filled with the correct volume of well-prepared and stirred slurry. In
order to avoid settling of the seed crystals, filling of the vessel should be carried out not long before actual
seeding. The operator or pan-man responsible for filling the vessel should be notified in time on approaching
seeding. It is possible to instruct SeedMaster 2 to give a warning (digital output DO1) when the selected
parameter (supersaturation or density) equals, or exceeds a “warning limit”, lower than the selected set-point
for seeding. Having reached the set-point for seeding digital output DO2 will be activated to open the seeding
valve for the selected (programmable) Ton time. At the same time DO1 will be turned off.
If the seeding vessel is furnished with a small motor driven stirrer, digital output DO1 can be used to turn the
motor automatically ON and OFF to prevent settling of the seeding crystals in the vessel.