Calpeda I-MAT 5,2TT-A Betriebsanleitung Seite 39

9.2.1. Constant pressure mode with single
transducer (absolute or differential)
This configuration uses a feedback given by a
pressure transducer (connected as shown in
section 6.7).
Parameters to programm or check (recommended
sequence):
Par.
Description
AP01 Maximum pump pressure
AP02 Primary transducer supply
Primary transducer
AP03
measuring unit
Primary transducer
AP04
minimum value
Primary transducer
AP05
maximum value
UP02
Nominal pump current
UP03
Nominal pump frequency
UP05
Operating mode
UP06
Primary set-point
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 first transducer and the second transducer as
shown in section 6.7.
Parameters to programm or check (recommended
sequence):
Par. Description
AP01 Maximum pump pressure
AP02
Primary transducer supply
Primary transducer
AP03
measuring unit
Primary transducer
AP04
minimum value
Primary transducer
AP05
maximum value
Secondary transducer
AP06
supply
Secondary transducer
AP07
measuring unit
Secondary transducer
AP08
minimum value
Secondary transducer
AP09
maximum value
AP10
Secondary transducer mode
UP02
Nominal pump current
UP03
Nominal pump frequency
UP05
Operating mode
UP06
Primary set-point
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.
I-MAT_Ed6 - Operating Instructions
Suggested value
based on pump type
data sheet
transducer
1 [bar]
data sheet
transducer
data sheet
transducer
see motor plate
see motor plate
PC
on demand [bar]
Suggested value
based on pump type
data sheet
transducer
1 [bar]
data sheet
transducer
data sheet
transducer
data sheet
transducer
1 [bar]
data sheet
transducer
data sheet
transducer
DiFF
see motor plate
see motor plate
PC
on demand [bar]
9.2.3. Minimum run
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 flow of a few liter per minute).
In this case the pump must be stopped for some
seconds and the flow 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 flow 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-flow rate line could be
set through the percentage of the pressure when
flow is equal to 0.
It is possible to have different configurations 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.
frequency and pre-
Page 39 / 164
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