DAB AD 2.2 AC Instruction For Installation And Maintenance page 95

WARNING: only use cables supplied with the inverter or which are considered as inverter accessories (it is not a standard cable
available on the market).
4.2.2 Sensors
To enable operation, a pressure set requires at least one pressure sensor and optionally one or more flow sensors.
The pressure sensors are ratiometric 0-5V versions, and in this case one can be connected per inverter, or 4-20mA current sensors,
in which case only one can be connected.
The flow sensors are always optional and from 0 to 1 can be connected per inverter.
4.2.2.1 Flow sensors
The flow sensor must be inserted on the delivery manifold on which all pumps are connected, and the electrical connection can be
made on any of the inverters.
The flow sensors can be connected in two ways:
one sensor only
•
the same number of sensors as inverters
•
The setting is entered on parameter FI.
Multiple sensors are useful when a specific flow rate is required on each pump, and enhance protection against dry running operation.
To use multiple flow sensors, parameter Fl must be set to multiple sensors and each flow sensor must be connected to the inverter
that controls the pump delivery where the sensor is located.
4.2.2.2 Sets with one pressure sensor only
Pressure sets can also be set up without a flow sensor. In this case the pump shutdown frequency FZ must be set as described in
6.5.9.1.
The dry running protection continues to function without the use of a flow sensor.
4.2.2.3 Pressure sensors
The pressure sensor/s must be inserted on the delivery manifold. There must be more than one pressure sensor if ratiometric (0-5V),
and only one if current (4-20mA). In the case of multiple sensors, the pressure reading will be the average of all those fitted. To use
multiple ratiometric pressure sensors (0-5V) simple insert the connectors in the relative inputs, without the need for setting any
parameters. The number of ratiometric pressure sensors (0-5V) installed can vary as required, from one to the maximum number of
inverters present. In the case of 4-20mA pressure sensors, only one may be installed; refer to paragraph 2.2.3.1.
4.2.3 Connection and setting of the optical coupling inputs
The inputs of the inverter are photocoupled (see para. 2.2.4 and 6.6.13); this means that galvanic separation of the inputs from the
inverter is guaranteed, to enable the functions for the float, auxiliary pressure, system disable, and low pressure on intake. The
functions are indicated respectively by the messages F1, Paux, F3, F4. If activated, the Paux function boosts the pressure in the
system to the set pressure, see par. 6.6.13.3. The functions F1, F3, F4 stop the pump for 3 different reasons, see par. 6.6.13.2,
6.6.13.4, 6.6.13.5.
When using a multiple inverter system, the inputs must be used with the following settings:
the contacts that perform the auxiliary pressures must be connected in parallel on all the inverters so that the same signal
•
arrives on all the inverters.
the contacts that perform the functions F1, F3, F4 may be connected either with independent contacts for each inverter, or
•
with only one contact connected in parallel on all the inverters (the function is activated only on the inverter at which the
command arrives).
The parameters for setting the inputs I1, I2, I3, I4 are part of the sensitive parameters, so setting one of these on any inverter means
that they are automatically aligned on all the inverters. As the setting of the inputs not only selects the function, but also the type of
polarity of the contact, the function associated with the same type of contact will perforce be found on all the inverters. For the above
reason, when using independent contacts for each inverter (as is possible for the functions F1, F3, F4), these must all have the same
ENGLISH
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