Calpeda I-MAT User Manual

GB
I-MAT_Ed2 - Operating Instructions Page 31 / 136
9.2.2. Constant pressure mode with 2 pressure
transducers (differential mode)
If it is required to use a differential pressure
feedback, between delivery and suction of the pump
by using 2 transducers it’s necessary to connect
the rst transducer and the second transducer as
shown in section 6.7.
Parameters to programm or check (recommended
sequence):
Par.
Description
Suggested value
AP01
Maximum pump pressure
based on pump type
AP02
Primary transducer supply
data sheet transducer
AP03
Primary transducer
measuring unit
1 [bar]
AP04
Primary transducer
minimum value
data sheet transducer
AP05
Primary transducer
maximum value
data sheet transducer
AP06
Secondary transducer
supply
data sheet transducer
AP07
Secondary transducer
measuring unit
1 [bar]
AP08
Secondary transducer
minimum value
data sheet transducer
AP09
Secondary transducer
maximum value
data sheet transducer
AP10
Secondary transducer mode
DiFF
UP02
Nominal pump current
see motor plate
UP03
Nominal pump frequency
see motor plate
UP05
Operating mode
PC
UP06
Primary set-point
on demand [bar]
To ensure the system works properly, the
primary transducer (B1-B4 clamps) must be
always connected to the delivery pipe, and
the secondary transducer (B5-B8 clamps)
must be always connected to the suction
pipe.
9.2.3. Minimum run frequency and pre-pause
frequency settings
The frequency converter is equipped with an
automatic stop system in case of low water. In
the case where the system does not guarantee
the correct stop of the pump, it is possible to set
manually the following values:
Frequency before stop
Minimum run frequency
In order to manually set these parameters it is
necessary to change the value of parameter AP17
from “Auto” to “Man”. Then the pre-pause frequency
values (PC02 and PC04 parameters) and the
minimum frequency values (PC01 and PC03
parameters), must be set using the calculation
formulas described in the next section.
9.2.4. Frequency before stop and minimum run
frequency calculation formulas
Adjusting the pre-pause frequency (PC02 and
PC04 parameters) allows you to properly stop the
pump when the water demand is low and the pump
operation is no longer required (e.g. a leakage or a
small ow of a few liter per minute).
In this case the pump must be stopped for some
seconds and the ow is guaranteed by the reserve
stored in the vessel.
The frequency before stop Hz P can be calculated
as follows:
50 Hz pumps
Hz=2+ √(Hset÷Hmax )x 50 (*)
60 Hz pumps
Hz=2+ √(Hset÷Hmax )x 60 (*)
where: - H set is the working pressure in bar
- H max is the maximum pump pressure, in
bar, when ow is equal to 0.
(*) For the maximum pump pressure it’s required:
For the pumps operating with suction lift subtract
the suction lift value (in bar).
For the pumps installed with suction positive add
the positive suction head value (in bar).
The minimum run frequency (PC01 and PC03
parameters) must be set 6-7 Hz lower than the
frequency before stop.
9.3. Proportional pressure mode
The proportional pressure operating mode reduce
the pressure proportionally with the water demand
of the system.
In this operating mode the frequency converter
keeps a set-point pressure at the maximum
frequency, this set-point pressure could be set with
the parameter UP06.
The slope of the pressure-ow rate line could be set
through the percentage of the pressure when ow
is equal to 0.
It is possible to have different congurations of this
operating mode related with the different types and
number of transducers installed:
Proportional pressure with 1 pressure transducer
(absolute or differential transducer).
Proportional pressure with 2 pressure transducers
in differential mode.
For detailed program settings see the following
conguration sections.
9.3.1. Proportional pressure mode with single
transducer (differential or absolute)
This conguration uses a feedback given by a
pressure transducer (connected as shown in
section 6.7).
Parameters to programm or check (recommended
sequence):
Par.
Description
Suggested value
AP01
Maximum pump pressure
based on pump type
AP02
Primary transducer supply
data sheet transducer
AP03
Primary transducer
measuring unit
1 [bar]
AP04
Primary transducer
minimum value
data sheet transducer
AP05
Primary transducer
maximum value
data sheet transducer
UP02
Nominal pump current
see motor plate
UP03
Nominal pump frequency
see motor plate
UP05
Operating mode
PP
UP06
Primary set-point
on demand [bar]
PP01
Percentage of the pressure
with zero ow
50 [%]

Calpeda I-MAT Specifications

General

Brand	Calpeda
Model	I-MAT
Category	Media Converter
Language	English