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INVT CHV160A Series - Page 136

INVT CHV160A Series
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C.TY TNHH TỰ ĐỘNG HÓA VIỆT TRUNG 02413.281.181-
0989.984.666
Website:www.viet-trung.com.vn Đ/c:194-Nguyễn Trãi-Võ Cường-
TP.Bắc Ninh
PUMP
ADD
P8.12
P8.13
DELAY
SW
ITCH FREQUENCY
0~3600s
0~3600
5s
0.0~P0.07
0.0~P0.07
50.00Hz
The
four
parameters
set
the
conditions
of
adding
pump.
1:
W
hen
frequency
of
variable-frequency
pump
reach
the
frequency
of
P8.11,at
the
same
time,
,pressure
feedback
value<pressure
set
value-pressure
tolerance,and
it
lasts
for
delay
time
(determined
by
P8.12),then
the
system
adds
pump.
2:
100%
of
pressure
tolerance
is
corresponding
with
P3.02
(Maximum
of
PID).
3:
P8.11
is
a
threshold
frequency
to
add
pump.W
hen
the
pressure
conditions
are
not
satisfied,
pump-added
logic
isstarted,
which
is
as
follow:
Add
variable-frequency
pump:
Switch
current
variable-frequency
pump
to
be
a
grid-frequency
pump
and
start
a
new
variable–frequency
pump.
Add
grid-frequency
pump:
Start
the
pumps
using
programmable
relay
,at
the
same
time,
the
current
variable-frequency
pump
decelerate
to
the
frequency
of
minusing
pump
according
to
the
setted
deceleration
time
determinded
by
P8.14,
and
then
go
on
running
with
PID
control.
It
can
stabilize
fluctuate
of
system
pressure
and
decreace
pressure
jump
when
add
pump.
4:
P8.13
switching
frequency
of
variable-frequency
pumps.
In
the
switch
process,
there
is
delay
time
from
disconnecting
variable-frequency
contactor
to
closeing
grid-frequency
contactor,
so
variable-frequency
pump
will
accelerate
to
a
higher
frequency
(which
is
the
switch
frequency)
before
switching
in
order
to
make
up
the

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