Alfa Laval PureBallast 135 Compact USCG, System Manual

Page: 126 / 412

ID Parameter Default
value
Min-Max Unit Description
p155
External feed min
setpoint
50 50–100 %
Defines lowest value PureBallast can request
from external feed. Only valid if PureBallast is
contolling ballast water flow by sending
signals to vessels ballast water pump or
throttle valve before PureBallast.
If external feed controls a ballast water pump,
PureBallast will never request it to run on a
lower speed than the percentage set in this
parameter. If a valve is controlled, the
parameter defines percent open.
The parameter also defines starting point for
flow regulation when a process is started, to
ensure a smooth start with a gradually
increased flow until desired value is reached.
Default value should normally be used.
p156
External feed change
rate
5 2–30 s / %
Defines how many seconds it takes to
change the external feed signal 1%.
Note: It might take a little longer for the actual
change of the pump or the valve to adjust the
flow.
p157
External feed V201–
8 low trigger limit
70 50–90 %
Defines when external feed control is
activated, based on V201-8.
PureBallast will start to request reduced flow
when V201-8 closes to reach this degree of
percent open.
p128
Max time
communication loss
60 15–240 sec
Define max delay before the system shuts
down after communication is lost between the
PLC and the remote interface (optional). The
value must be greater than the heartbeat
signal interval defined in the ISCS.
For further information see
Remote interface
implementation guide .
p141
Timeout: Request
“Start BW pump”
1 1–3 min
Time the control system will wait for
confirmation (hard wired from ISCS or
manually in popup). After defined time, the
process is stopped.
The parameter is used for both BW pump
during ballast/deballast and for stripping
pump during stripping.
p144
Timeout: Start-up
process flow
established
60 30–180 sec
Time the control system will wait for accepted
minimum flow (10 % of full capacity) to be
established before automatic stop.
p166
Pressure PID
proportional gain
5
0.00–
10.00
N/A
Defines proportional gain (Pf) value used for
PID regulation of V201–8 during backflush.
The PID regulation during backflush is based
on input from pressure transmitter PT201-16.
Normal value: 0.1 – 1.5.
p167
Pressure PID integral
time
2.0
0.0–
100.0
sec
Defines integral time (If) value used for PID
regulation of V201–8 during backflush.
This parameter shall normally not be
changed.
Normal value: 5 – 12.
200000695-1-EN-GB 121
Parameters 4 EN