K-Patents SeedMaster 2 - Manual (Page 19)

3 THE SEEDMASTER 2 CRYSTALLIZATION TRANSMITTER … 19
19
•
from the fact, that the current or power consumption of the stirrer motor exceeds a pre-set low
limit (cut off value, motor ON/OFF)), or
•
from a PCS via digital communication.
NOTES:
1. The source of the “STRIKE ACTIVE” information can be selected from the above 3 during configuration.
If motor consumption or information from a PCS is being used to synchronise the operation of SeedMaster 2
to crystallizer status, digital input DIN1 can be left un-connected.
2. If motor consumption (power, or current) is used as “STRIKE ACTIVE”, un-intentional stop (due to mains
failure, motor problems etc.) of the stirrer motor during a strike will be treated as an “End of strike” signal.
3. It is advised to use a contact input for “STRIKE ACTIVE” signalisation.
3.6.2 “SEEDED” input DIN2
In order to perform the calculations correctly SeedMaster 2 needs information on the seeding of the pan.
There is no need for this input if seeding of the pan is carried out by SeedMaster 2 itself, that is if
•
AUTOMATIC SEEDING was configured, or
•
the operator uses the “MANUAL SEEDING” feature regularly (not advised).
However, if seeding is carried out
•
either by an independent process control system (PCS), or
•
the PCS commands SeedMaster 2 to do the seeding, or
•
manually by the operator (pan-man) without using the “MANUAL SEEDING” feature of
SeedMaster 2,
the device must be notified on the seeding of the pan by a digital input lasting for at least 20 seconds.
In this case information may come in the form of a digital input (DIN2) signal, or via digital communication
from an independent control system (PCS).
SEEDED DIN2 SEEDED DIN2
WAIT STRIKE 1 ACTIVE STRIKE 2 ACTIVE Time
NOTES:
1. Failing to provide information on seeding when needed will result in erroneous operation.
2. When SeedMaster 2 receives information from a PCS on seeding, it will operate the same way as it would
if MANUAL SEEDING were configured, that is it will OPEN the seeding valve (DO2, if connected) for the
configured Ton time.
3.6.3 “CHANGE FEED SYRUP” input DIN3.
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. One way to do it is to use a
digital input (DIN3).
In this case information on purity and pan level may come in the form of 4-20 mA current from a PLC or DCS.
If there are no level data available, the SeedMaster 2 will use typical simulated level data in the 35-80 %
range. Operation of the DIN3 digital input will step the feed syrup purity to the one determined by the actual
current input (maximum 3 times). (For more information on feed syrup change see: 5.1.4 and 8.2.2).
3.7 Data outputs
3.7.1 Data available for transmission
Besides the 6 (out of 7) massecuite parameters 4 additional ones per pan are displayed on the LCD of
SeedMaster 2. Altogether 11 are available for transmission to an other device (PCS).
Time
S T R I K E A C T I V E
DIN1