Alfa Laval PureBallast 135 Compact USCG, System Manual

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4.2.4 Page 5.3 — Filter parameters
This section describes parameters controlling the filter module.
ID Parameter Default
value
Min-
Max
Unit Description
p300
High filter differential
pressure shutdown
trigger
2.0 0.0–3.0 bar
Setpoint for shutdown due to high differential
pressure between by pressure transmitter
PT201–71 and PT201–16.
p302
Extended backflush
time trigger
2 1–30 min
If two backflushes are triggered by differential
pressure within this time, the filter will run an
extended backflush for p303 minutes.
p303
Extended backflush
duration
20 1–30 min
Defines the duration for the extended
backflush , after triggered by p302.
p304
Pressure setpoint
during backflush
1.5 1.0–5.0 bar
Defines desired pressure for efficient
backflushing.
When a backflush is triggered, control valve
V201–8 will regulate to reach this pressure.
After time set in parameter p310 the backflush
will start, regardless of if the pressure has
been reached.
During backflush pressure is maintained by
PID regulation of control valve V201-8, based
on input from pressure transmitter PT201-16.
Parameter is set according to the formula:
p304 ≥ 1.0 bar + calculated pressure drop for
pipe 309.
p305
Backflush trigger:
Differential pressure
0.5 0.0–2.0 bar
Setpoint for automatic start of filter backflush
due to dirt in the filter, indicated by high
differential pressure over filter (PT201-71 and
PT201-72).
Note: This parameter can be adjusted, but
only by Alfa Laval during commissioning.
p308
Backflush cycle time 20 1–100 sec Defines duration of one filter backflush.
200000695-1-EN-GB 124
4 Parameters EN