LSIS LSLV0055H100-4COFN - Soft Fill Operation

Learning Advanced Features
174
5.8.2 Soft Fill Operation
A soft fill operation is used to prevent excessive pressure from building in the pipe system at
the initial stage of a pump operation. When the operation command is given, a general
acceleration (without PID control) begins and continues until the output reaches the
frequency set at AP1-21, for the time set at AP1-22. Then, the soft fill PID operation is
performed unless the feedback value has reached the value set at AP1-23 (Soft Fill Set
value). The soft fill PID operation continues until the feedback or the soft fill PID reference
value reaches the value set at AP1-23 (Soft Fill Set value). When the soft fill operation ends,
a normal PID operation starts.
Group
Code
Name
LCD Display
Parameter
Setting
Setting Range
Unit
AP1
20
Soft Fill options
Soft Fill Sel
0
No
0–1
-
21
Pr- PID operation
frequency
Pre-PID Freq
30.00
Low Freq–
High Freq
Hz
22
Pre-PID duration
Pre-PID
Delay
60.0
600.0
sec
23
Soft fill escape
value
Soft Fill Set
20.00
Unit Min–Unit
Max
%
24
Soft fill reference
increment
Fill Step Set
2.00
0–Unit Band
%
25
Soft fill reference
increment cycle
Fill Step Time
20
0–9999
sec
26
Soft fill feedback
difference
Fill Fdb Diff
0.00
0–Unit Band
%
Soft Fill Operation Setting Details
Code
Description
AP1-20
Soft Fill Sel
Enables or disables the soft fill PID.
AP1-21
Pre-PID Freq
Sets the frequency range for a general acceleration without PID control. If
AP1-21 (Pre-PID Freq) is set to 30 Hz, general operation is performed until
the PID feedback reaches the value set at AP1-23 (Soft Fill Set). However,
if the PID reference or feedback exceeds the value set at AP1-23 during