DAB PUMPS PWM 201, Instruction For Installation And Maintenance

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4.2.1 Communication cable (Link)
The inverters communicate with one another and propagate the flow and pressure signals (only if a ratiometric pressure sensor is
used) via the specific connection cable.
The cable can be connected to any one of the two connectors marked “Link”, see Figure 16.
Figure 16: Link connection
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.