DAB PUMPS PWM 201, Instruction For Installation And Maintenance

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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
logic for the various inputs with the same name; that is, for the same input, either normally open contacts are used for all the
inverters or normally closed ones.
4.3 Multi inverter operating parameters
The parameters displayed on the menu, in a multi-inverter configuration, can be classed as follows:
• Read-only parameters
•
Local parameters
•
Multi inverter system configuration parameters in turn divided as
o
Sensitive parameters
o Parameters with optional alignment
4.3.1 Parameters related to multi inverter systems
4.3.1.1 Local parameters
These are parameters that can differ from one inverter to another and in some cases actually need to be different. For these
parameters, automatic alignment of inverter configuration is not admitted. In the case of manual assignment of addresses, these
must all be different.
List of local parameters for inverters:

CT Contrast

FP Test frequency in manual mode

RT Direction of rotation

AD Address

IC Reserve configuration

RF Fault and warning reset
4.3.1.2 Sensitive parameters
These are parameters that must be aligned on the entire series for control purposes.
List of sensitive parameters:

SP Setpoint pressure

P1 Input 1 auxiliary pressure